Shares Rhino Resources, Inc. Common Stock (Par Value $0.01 Per Share) UNDERWRITING AGREEMENT

Exhibit 1.1

Shares

Rhino Resources, Inc.

Common Stock (Par Value $0.01 Per Share)

UNDERWRITING AGREEMENT

, 2008

▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated
▇▇▇▇▇▇ Brothers Inc.

▇▇▇▇▇▇▇ ▇▇▇▇▇ & Associates, Inc.

RBC Capital Markets Corporation

▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇ & Company, Incorporated

Wachovia Capital Markets, LLC

▇▇▇▇▇▇▇ ▇▇▇▇ & Company, LLC

▇▇▇▇▇▇▇▇▇ & Company LLC

Friedman, Billings, ▇▇▇▇▇▇ & Co., Inc.

PNC Capital Markets LLC

c/o Morgan ▇▇▇▇▇▇▇ & Co. Incorporated
▇▇▇▇ ▇▇▇▇▇▇▇▇
▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇

Ladies and Gentlemen:

Rhino Resources, Inc., a Delaware corporation (the “Company”), proposes to issue and sell to the several Underwriters named in Schedule I hereto (the “Underwriters”), and Rhino Energy Holdings LLC, a Delaware limited liability company (the “Selling Shareholder”) proposes to sell to the several Underwriters, an aggregate of shares of the common stock (par value $0.01 per share) of the Company (the “Firm Shares”), of which shares are to be issued and sold by the Company and shares are to be sold by the Selling Shareholder.

The Selling Shareholder also proposes to issue and sell to the several Underwriters not more than an additional shares of its common stock (par value $0.01 per share) of the Company (the “Additional Shares”) if and to the extent that you, as Managers of the offering, shall have determined to exercise, on behalf of the Underwriters, the right to purchase such shares of common stock granted to the Underwriters in Section 3 hereof. The Firm Shares and the Additional Shares are hereinafter collectively referred to as the “Shares.” The shares of common stock (par value $0.01 per share) of the Company to be outstanding after giving effect to the sales contemplated hereby are hereinafter referred to as the “Common Stock.” The Company and the Selling Shareholder are hereinafter sometimes collectively referred to as the “Sellers.”

The Company, or a predecessor thereof, has filed with the Securities and Exchange Commission (the “Commission”) a registration statement, including a

prospectus, relating to the Shares. The registration statement as amended at the time it becomes effective, including the information (if any) deemed to be part of the registration statement at the time of effectiveness pursuant to Rule 430A under the Securities Act of 1933, as amended (the “Securities Act”), is hereinafter referred to as the “Registration Statement”; the prospectus in the form first used to confirm sales of Shares (or in the form first made available to the Underwriters by the Company to meet requests of purchasers pursuant to Rule 173 under the Securities Act) is hereinafter referred to as the “Prospectus.” If the Company has filed an abbreviated registration statement to register additional shares of Common Stock pursuant to Rule 462(b) under the Securities Act (the “Rule 462 Registration Statement”), then any reference herein to the term “Registration Statement” shall be deemed to include such Rule 462 Registration Statement.

For purposes of this Agreement, “free writing prospectus” has the meaning set forth in Rule 405 under the Securities Act, “Time of Sale Prospectus” means the preliminary prospectus together with the free writing prospectuses, if any, each identified in Schedule II hereto, and “broadly available road show” means a “bona fide electronic road show” as defined in Rule 433(h)(5) under the Securities Act that has been made available without restriction to any person. As used herein, the terms “Registration Statement,” “preliminary prospectus,” “Time of Sale Prospectus” and “Prospectus” shall include the documents, if any, incorporated by reference therein.

In connection with the closing of the offering contemplated by this Agreement, the Selling Shareholder, an entity owned by certain investment funds managed by Wexford Capital LLC (“Wexford”), and certain investment funds managed by Wexford will contribute 100% of the ownership interests in Rhino Energy LLC (“Rhino Energy”) to the Company in exchange for an aggregate of shares of the Company’s Common Stock. The investment funds managed by Wexford will contribute their shares of the Company’s Common Stock to the Selling Shareholder. The Selling Shareholder will sell shares of the Company’s Common Stock (and up to an additional shares of the Company’s Common Stock as described above) and the Company will issue shares of its Common Stock to the public, all as described in the Registration Statement. Rhino Energy and the Company are sometimes referred to collectively herein as the “Rhino Parties.”

1. Representations and Warranties of the Company. Each of the Rhino Parties, jointly and severally, represents and warrants to and agrees with each of the Underwriters that:

(a) The Registration Statement has become effective; no stop order suspending the effectiveness of the Registration Statement is in effect, and no proceedings for such purpose are pending before or threatened by the Commission.

(b) (i) The Registration Statement, when it became effective, did not contain and, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (ii) the Registration Statement and the Prospectus comply and, as amended or supplemented, if applicable, will comply in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder, (iii) the Time of Sale Prospectus does not, and at the time of each sale of the Shares in connection with the offering when the Prospectus is not yet available to prospective purchasers and at the Closing Date (as defined in Section 5), the Time of Sale Prospectus, as then amended or supplemented by the Company, if applicable, will not, contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, (iv) each broadly available road show, if any, when considered together with the Time of Sale Prospectus, does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading and (v) the Prospectus does not contain and, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, except that the representations and warranties set forth in this paragraph do not apply to statements or omissions in the Registration Statement, the Time of Sale Prospectus or the Prospectus based upon information relating to any Underwriter furnished to the Company in writing by such Underwriter through you expressly for use therein.

(c) The Company is not an “ineligible issuer” in connection with the offering pursuant to Rules 164, 405 and 433 under the Securities Act. Any free writing prospectus that the Company is required to file pursuant to Rule 433(d) under the Securities Act has been, or will be, filed with the Commission in accordance with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Each free writing prospectus that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act or that was prepared by or on behalf of or used or referred to by the Company complies or will comply in all material respects with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Except for the free writing prospectuses, if any, identified in Schedule II hereto, and electronic road shows, if any, each furnished to you before first use, the Company has not prepared, used or referred to, and will not, without your prior consent, prepare, use or refer to, any free writing prospectus.

(d) The Company has been duly incorporated, is validly existing as a corporation in good standing under the laws of the jurisdiction of its incorporation, has the corporate power and authority to own its property and to conduct its business as described in the Time of Sale Prospectus and is duly

qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not have a material adverse effect on the Company, Rhino Energy and the Rhino Subsidiaries as defined below (collectively, the “Rhino Entities”) taken as a whole.

(e) Rhino Energy has been duly formed, is validly existing as a limited liability company in good standing under the laws of the jurisdiction of its formation, has the limited liability company power and authority to own its property and to conduct its business as described in the Time of Sale Prospectus and is duly qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not have a material adverse effect on the Rhino Entities, taken as a whole; all of the issued limited liability company interests of Rhino Energy have been duly and validly authorized and issued, are fully paid and non-assessable and are owned directly by Rhino Energy Holdings LLC, free and clear of all liens, encumbrances, equities or claims (except as described in the Registration Statement).

(f) Each of CAM Mining LLC, ▇▇▇▇▇▇▇ Canyon Mining LLC, CAM - Colorado LLC, Rhino Coalfield Services LLC, Rhino Trucking LLC, Rhino Services LLC, Rhino Exploration LLC, Rhino Oilfield Services LLC, Rhino Northern Holdings LLC, Rhino Eastern LLC, Hopedale Mining LLC, CAM-Ohio Real Estate LLC, Springdale Land, LLC, Sands Hill Mining LLC, ▇▇▇▇▇▇▇ ▇▇▇▇▇ LLC, ▇▇▇▇▇ Mining LLC, Reserve Holdings LLC, CAM-Kentucky Real Estate LLC, CAM-BB LLC, Taylorville Mining LLC, Leesville Land, LLC, CAM Coal Trading LLC, CAM Aircraft LLC, Eagle Mid Vol LLC, Rhino Energy WV LLC and Rockhouse Land LLC (collectively, the “Rhino Subsidiaries”) has been duly formed, is validly existing as a limited liability company in good standing under the laws of the jurisdiction of its formation, has the limited liability company power and authority to own its property and to conduct its business as described in the Time of Sale Prospectus and is duly qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not have a material adverse effect on the Rhino Entities, taken as a whole; all of the issued limited liability company interests of each Rhino Subsidiary have been duly and validly authorized and issued, are fully paid and non-assessable (except as such non-assessability may be affected by Section 18-607 or 18-804 of the Delaware Limited Liability Act (the “Delaware LLC Act”)) and are owned directly or indirectly by Rhino Energy, free and clear of all liens, encumbrances, equities or claims (except as described in the Registration Statement).

(g) This Agreement has been duly authorized, executed and delivered by each of the Rhino Parties.

(h) The authorized capital stock of the Company conforms in all material respects as to legal matters to the description thereof contained in each of the Time of Sale Prospectus and the Prospectus.

(i) The shares of Common Stock (including the Shares to be sold by the Selling Shareholder) outstanding prior to the issuance of the Shares to be sold by the Company have been duly authorized and are validly issued, fully paid and non-assessable.

(j) The Shares have been duly authorized and, when issued and delivered in accordance with the terms of this Agreement, will be validly issued, fully paid and non-assessable, and the issuance of such Shares will not be subject to any preemptive or similar rights, except as described in the Registration Statement.

(k) The execution and delivery by the Rhino Parties of, and the performance by the Rhino Parties of their respective obligations under, this Agreement will not contravene any provision of applicable law or the certificate of incorporation, by-laws or other organizational or governing documents of the Rhino Parties or any agreement required to be filed as an exhibit to the Registration Statement, each taken as a whole, or any judgment, order or decree of any governmental body, agency or court having jurisdiction over the Rhino Entities, and no consent, approval, authorization or order of, or qualification with, any governmental body or agency is required for the performance by the Rhino Parties of their respective obligations under this Agreement, except such as may be required by the securities or Blue Sky laws of the various states in connection with the offer and sale of the Shares except for (i) the registration of the issuance or resale, as applicable, of the Shares under the Securities Act, (ii) such consents, approvals, authorizations, registrations or qualifications as may be required under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and applicable state securities laws in connection with the purchase and distribution of the Shares by the Underwriters, (iii) such consents that have been, or prior to the Closing Date and each date of delivery of the Shares will be, obtained and (iv) such consents that, if not obtained, would not, individually or in the aggregate, have a material adverse effect on the Rhino Entities, taken as a whole.

(l) There has not occurred any material adverse change, or any development involving a prospective material adverse change, in the condition, financial or otherwise, or in the earnings, business or operations of the Rhino Entities, taken as a whole, from that set forth in the Time of Sale Prospectus.

(m) There are no legal or governmental proceedings pending or to the knowledge of the Rhino Parties, threatened to which any of the Rhino Entities is a

party or to which any of the properties of the Rhino Entities is subject (i) other than proceedings accurately described in all material respects in the Time of Sale Prospectus and proceedings that would not have a material adverse effect on the Rhino Entities, taken as a whole, or on the power or ability of the Rhino Parties to perform their respective obligations under this Agreement or to consummate the transactions contemplated by the Time of Sale Prospectus or (ii) that are required to be described in the Registration Statement or the Prospectus and are not so described; and there are no statutes, regulations, contracts or other documents that are required to be described in the Registration Statement or the Prospectus or to be filed as exhibits to the Registration Statement that are not described or filed as required.

(n) Each preliminary prospectus filed as part of the registration statement as originally filed or as part of any amendment thereto, or filed pursuant to Rule 424 under the Securities Act, complied when so filed in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder.

(o) Neither of the Rhino Parties are, and after giving effect to the offering and sale of the Shares and the application of the proceeds thereof as described in the Prospectus neither of the Rhino Parties will be, required to register as an “investment company” as such term is defined in the Investment Company Act of 1940, as amended.

(p) The Rhino Entities (i) are in compliance with any and all applicable foreign, federal, state and local laws and regulations relating to the protection of human health and safety, the environment or hazardous or toxic substances or wastes, pollutants or contaminants (“Environmental Laws”), (ii) have received all permits, licenses or other approvals required of them under applicable Environmental Laws to conduct their respective businesses and (iii) are in compliance with all terms and conditions of any such permit, license or approval, except where such noncompliance with Environmental Laws, failure to receive required permits, licenses or other approvals or failure to comply with the terms and conditions of such permits, licenses or approvals (x) would not, singly or in the aggregate, have a material adverse effect on the Rhino Entities, taken as a whole, or (y) is permitted by an applicable cure or abatement period.

(q) There are no costs or liabilities associated with Environmental Laws (including, without limitation, any capital or operating expenditures required for clean-up, closure of properties or compliance with Environmental Laws or any permit, license or approval, any related constraints on operating activities and any potential liabilities to third parties) which would, singly or in the aggregate, have a material adverse effect on the Rhino Entities, taken as a whole.

(r) Except as disclosed in the Registration Statement, there are no contracts, agreements or understandings between the Company and any person granting such person the right to require the Company to file a registration statement under the Securities Act with respect to any securities of the Company or to require the Company to include such securities with the Shares registered pursuant to the Registration Statement.

(s) Neither of the Rhino Entities, nor, to any of the Rhino Parties’ knowledge, any director, officer, or employee, any agent or representative of the Rhino Entities, has taken or will take any action in furtherance of an offer, payment, promise to pay, or authorization or approval of the payment or giving of money, property, gifts or anything else of value, directly or indirectly, to any “government official” (including any officer or employee of a government or government-owned or controlled entity or of a public international organization, or any person acting in an official capacity for or on behalf of any of the foregoing, or any political party or party official or candidate for political office) to influence official action or secure an improper advantage; and each of the Rhino Entities has conducted their businesses in compliance with applicable anti-corruption laws and has instituted and maintain and will continue to maintain policies and procedures designed to promote and achieve compliance with such laws and with the representation and warranty contained herein.

(t) The operations of each of the Rhino Entities are and have been conducted at all times in material compliance with all applicable financial recordkeeping and reporting requirements, including those of the Bank Secrecy Act, as amended by Title III of the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (USA PATRIOT Act), and the applicable anti-money laundering statutes of jurisdictions where any of the Rhino Entities conduct business, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency (collectively, the “Anti-Money Laundering Laws”), and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving any of the Rhino Entities with respect to the Anti-Money Laundering Laws is pending or, to the knowledge of the Rhino Parties, threatened.

(u) (i) Neither the Rhino Entities nor, to the knowledge of any the Rhino Parties, any director, officer, employee, agent, affiliate or representative of a Rhino Entity, is an individual or entity (“Person”) that is, or is owned or controlled by a Person that is:

(A) the subject of any sanctions administered or enforced by the U.S. Department of Treasury’s Office of Foreign Assets Control (“OFAC”) , the United Nations Security Council (“UNSC”), the European Union (“EU”), Her Majesty’s Treasury

(“HMT”), or other relevant sanctions authority (collectively, “Sanctions”), nor

(B) located, organized or resident in a country or territory that is the subject of Sanctions (including, without limitation, Burma/Myanmar, Cuba, Iran, North Korea, Sudan and Syria).

(ii) Each of the Rhino Parties represents and covenants that it will not, directly or indirectly, use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other Person:

(A) to fund or facilitate any activities or business of or with any Person or in any country or territory that, at the time of such funding or facilitation, is the subject of Sanctions; or

(B) in any other manner that will result in a violation of Sanctions by any Person (including any Person participating in the offering, whether as underwriter, advisor, investor or otherwise).

(iii) Each of the Rhino Parties represents and covenants that for the past 5 years, it has not knowingly engaged in, is not now knowingly engaged in, and will not engage in, any dealings or transactions with any Person, or in any country or territory, that at the time of the dealing or transaction is or was the subject of Sanctions.

(v) Subsequent to the respective dates as of which information is given in each of the Registration Statement, the Time of Sale Prospectus and the Prospectus, (i) the Rhino Entities have not incurred any material liability or obligation, direct or contingent, nor entered into any material transaction; (ii) the Company has not purchased any of its outstanding capital stock, nor declared, paid or otherwise made any dividend or distribution of any kind on its capital stock other than ordinary and customary dividends; and (iii) there has not been any material change in the capital stock, short-term debt or long-term debt of the Rhino Entities, except in each case as described in each of the Registration Statement, the Time of Sale Prospectus and the Prospectus, respectively.

(w) The Rhino Entities have good and marketable title to all real property and good and marketable title to all personal property owned by them which is material to the business of the Rhino Entities, in each case free and clear of all liens, encumbrances and defects (except such as are described in the Time of Sale Prospectus) or such as do not materially affect the value of such property and do not materially interfere with the use made and proposed to be made of such property by the Rhino Entities; and any real property and buildings held under lease by the Rhino Entities are held by them under valid, subsisting and enforceable leases with such exceptions as are not material and do not materially

interfere with the use made and proposed to be made of such property and buildings by the Rhino Entities, in each case except as described in the Time of Sale Prospectus.

(x) The Rhino Entities own or possess, or can acquire on reasonable terms, all material patents, patent rights, licenses, inventions, copyrights, know-how (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures), trademarks, service marks and trade names currently employed by them in connection with the business now operated by them, and none of the Rhino Entities has received any notice of infringement of or conflict with asserted rights of others with respect to any of the foregoing which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would have a material adverse effect on the Rhino Entities, taken as a whole.

(y) No material labor dispute with the employees of the Rhino Entities (and to the extent that they perform services on behalf of any of the Rhino Entities, employees of Wexford) exists, except as described in the Time of Sale Prospectus, or, to the knowledge of the Rhino Parties, is imminent; and the Rhino Parties are not aware of any existing, threatened or imminent labor disturbance by the employees of any of its principal suppliers, manufacturers or contractors that could have a material adverse effect on the Rhino Entities, taken as a whole.

(z) The Rhino Entities are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the businesses in which they are engaged; none of the Rhino Entities has been refused any insurance coverage sought or applied for; and neither of the Rhino Parties has any reason to believe that any of the Rhino Entities will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business at a cost that would not have a material adverse effect on the Rhino Entities, taken as a whole, except as described in the Time of Sale Prospectus.

(aa) The Rhino Entities possess all certificates, authorizations and permits issued by the appropriate federal, state or foreign regulatory authorities necessary to conduct their respective businesses, and none of the Rhino Entities has received any notice of proceedings relating to the revocation or modification of any such certificate, authorization or permit which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would have a material adverse effect on the Rhino Entities, taken as a whole, except as described in the Time of Sale Prospectus.

(bb) The Rhino Parties, on behalf of each of the Rhino Entities, maintain a system of internal accounting controls sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management’s

general or specific authorizations; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles and to maintain asset accountability; (iii) access to assets is permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. Except as described in the Time of Sale Prospectus, since the end of Rhino Energy’s most recent audited fiscal year, there has been (i) no material weakness in Rhino Energy’s internal control over financial reporting (whether or not remediated) and (ii) no change in Rhino Energy’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, Rhino Energy’s internal control over financial reporting.

(cc) Except as described in the Registration Statement and the Time of Sale Prospectus, the Rhino Parties have not sold, issued or distributed any shares of Common Stock or other equity securities during the six-month period preceding the date hereof, including any sales pursuant to Rule 144A under, or Regulation D or S of, the Securities Act, other than shares issued pursuant to employee benefit plans, qualified stock option plans or other employee compensation plans or pursuant to outstanding options, rights or warrants.

(aa) The Shares have been duly approved for listing, subject only to official notice of issuance, on the New York Stock Exchange, Inc.

(bb) The Rhino Entities have filed all foreign, federal, state and local tax returns with the appropriate tax authorities that are required to be filed, or have duly requested extensions thereof, and have paid all taxes required to be paid by them and any other assessment, fine or penalty levied against them, except in each case in which the failure to so file or pay would not have a material adverse effect on the Rhino Entities, taken as a whole. The charges, accruals and reserves on the books of each of the Rhino Entities in respect of any income and corporation tax liability for any years not finally determined are adequate to meet any assessments or re-assessments for additional income or corporation tax for any years not finally determined, except to the extent of any inadequacy that would not have a material adverse effect on the Rhino Entities, taken as a whole.

2. Representations and Warranties of the Selling Shareholder. The Selling Shareholder represents and warrants to and agrees with each of the Underwriters that:

(a) This Agreement has been duly authorized, executed and delivered by or on behalf of the Selling Shareholder.

(b) The Selling Shareholder has, and on the Closing Date will have, valid title to, or a valid “security entitlement” within the meaning of Section 8-501 of the New York Uniform Commercial Code in respect of, the Shares to be

sold by the Selling Shareholder free and clear of all security interests, claims, liens, equities or other encumbrances and the legal right and power, and all authorization and approval required by law, to enter into this Agreement and to sell, transfer and deliver the Shares to be sold by the Selling Shareholder or a security entitlement in respect of such Shares.

(c) Upon payment for the Shares to be sold by the Selling Shareholder pursuant to this Agreement, delivery of such Shares, as directed by the Underwriters, to Cede & Co. (“Cede”) or such other nominee as may be designated by the Depository Trust Company (“DTC”), registration of such Shares in the name of Cede or such other nominee and the crediting of such Shares on the books of DTC to securities accounts of the Underwriters (assuming that neither DTC nor any such Underwriter has notice of any adverse claim (within the meaning of Section 8-105 of the New York Uniform Commercial Code (the “UCC”)) to such Shares), (A) DTC shall be a “protected purchaser” of such Shares within the meaning of Section 8-303 of the UCC, (B) under Section 8-501 of the UCC, the Underwriters will acquire a valid security entitlement in respect of such Shares and (C) no action based on any “adverse claim”, within the meaning of Section 8-102 of the UCC, to such Shares may be asserted against the Underwriters with respect to such security entitlement; for purposes of this representation, the Selling Shareholder may assume that when such payment, delivery and crediting occur, (x) such Shares will have been registered in the name of Cede or another nominee designated by DTC, in each case on the Company’s share registry in accordance with its certificate of incorporation, bylaws and applicable law, (y) DTC will be registered as a “clearing corporation” within the meaning of Section 8-102 of the UCC and (z) appropriate entries to the accounts of the several Underwriters on the records of DTC will have been made pursuant to the UCC.

(d) The Selling Shareholder has no reason to believe that the representations and warranties of the Company contained in Section 1 are not true and correct, is familiar with the Registration Statement, the Time of Sale Prospectus and the Prospectus and has no knowledge of any material fact, condition or information not disclosed in the Time of Sale Prospectus or the Prospectus that has had, or may have, a material adverse effect on the Company and its subsidiaries, taken as a whole. The Selling Shareholder is not prompted by any information concerning the Company or its subsidiaries which is not set forth in the Time of Sale Prospectus to sell its Shares pursuant to this Agreement.

(e) The Registration Statement, when it became effective, did not contain and, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (i) the Registration Statement and the Prospectus comply and, as amended or supplemented, if applicable, will comply in all material respects with the Securities Act and the applicable rules and regulations of the Commission

thereunder, (ii) the Time of Sale Prospectus does not, and at the time of each sale of the Shares in connection with the offering when the Prospectus is not yet available to prospective purchasers and at the Closing Date (as defined in Section 5), the Time of Sale Prospectus, as then amended or supplemented by the Company, if applicable, will not, contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, (iii) each broadly available road show, if any, when considered together with the Time of Sale Prospectus, does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading and (iv) the Prospectus does not contain and, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, except that the representations and warranties set forth in this paragraph (g) do not apply to statements or omissions in the Registration Statement or the Prospectus based upon information relating to any Underwriter furnished to the Company in writing by such Underwriter through you expressly for use therein.

3. Agreements to Sell and Purchase. Each Seller, severally and not jointly, hereby agrees to sell to the several Underwriters, and each Underwriter, upon the basis of the representations and warranties herein contained, but subject to the conditions hereinafter stated, agrees, severally and not jointly, to purchase from such Seller at $ a share (the “Purchase Price”) the number of Firm Shares (subject to such adjustments to eliminate fractional shares as you may determine) that bears the same proportion to the number of Firm Shares to be sold by such Seller as the number of Firm Shares set forth in Schedule I hereto opposite the name of such Underwriter bears to the total number of Firm Shares.

On the basis of the representations and warranties contained in this Agreement, and subject to its terms and conditions, the Selling Shareholder agrees to sell to the Underwriters the Additional Shares, and the Underwriters shall have the right to purchase, severally and not jointly, up to Additional Shares at the Purchase Price. You may exercise this right on behalf of the Underwriters in whole or from time to time in part by giving written notice not later than 30 days after the date of this Agreement. Any exercise notice shall specify the number of Additional Shares to be purchased by the Underwriters and the date on which such shares are to be purchased. Each purchase date must be at least one business day after the written notice is given and may not be earlier than the Closing Date nor later than ten business days after the date of such notice. Additional Shares may be purchased as provided in Section 5 hereof solely for the purpose of covering over-allotments made in connection with the offering of the Firm Shares. On each day, if any, that Additional Shares are to be purchased (an “Option Closing Date”), each Underwriter agrees, severally and not jointly, to purchase the number of Additional Shares (subject to such adjustments to

eliminate fractional shares as you may determine) that bears the same proportion to the total number of Additional Shares to be purchased on such Option Closing Date as the number of Firm Shares set forth in Schedule I hereto opposite the name of such Underwriter bears to the total number of Firm Shares.

Each Seller also covenants with each Underwriter that, without the prior written consent of ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated and ▇▇▇▇▇▇ Brothers Inc. on behalf of the Underwriters, it will not, during the period ending 180 days after the date of the Prospectus (the “180-Day Restricted Period”), (1) offer for sale, sell, pledge, or otherwise dispose of (or enter into any transaction or device that is designed to, or could be expected to, result in the disposition by any person at any time in the future of) any shares of Common Stock (including, without limitation, shares that may be deemed to be beneficially owned in accordance with the rules and regulations of the Commission and shares of Common Stock that may be issued upon exercise of any options or warrants) or securities convertible into or exercisable or exchangeable for Common Stock, (2) enter into any swap or other derivatives transaction that transfers to another, in whole or in part, any of the economic consequences of ownership of Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or other securities, in cash or otherwise, (3) cause to be filed a registration statement, including any amendments thereto, with respect to the registration of any shares of Common Stock or securities convertible, exercisable or exchangeable into Common Stock or such other securities, or (4) publicly disclose the intention to do any of the foregoing.

The restrictions contained in the preceding paragraph shall not apply to (a) the Shares to be sold hereunder or (b) the issuance and sale of Common Stock, restricted stock and options under the Company’s employee benefits plans, including sales pursuant to “cashless-broker” exercises of options to purchase shares of Common Stock in accordance with such plans as consideration for the exercise price and withholding taxes applicable to such exercises, (c) transactions by a Selling Shareholder relating to shares of Common Stock or other securities acquired in open market transactions after the completion of the offering of the Shares, (d) transfers by the Selling Shareholder of shares of Common Stock or any security convertible into Common Stock as a bona fide gift, (e) distributions by the Selling Shareholder of shares of Common Stock or any security convertible into Common Stock to limited partner, members or stockholders of the Selling Shareholder; provided that in the case of any transfer or distribution pursuant to clause (d) or (e), (i) each donee or distributee shall enter into a written agreement accepting the restrictions set forth in the preceding paragraph and this paragraph as if it were a Selling Shareholder and (ii) no filing under Section 16(a) of the Exchange Act, reporting a reduction in beneficial ownership of shares of Common Stock, shall be required or shall be voluntarily made in respect of the transfer or distribution during the 180-day Restricted Period, or (f) the establishment of a trading plan pursuant to Rule 10b5-1 under the Exchange Act for the transfer of shares of Common Stock, provided that such plan does not

provide for the transfer of Common Stock during the 180-day Restricted Period. In addition, the Selling Shareholder, agrees that, without the prior written consent of ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated and ▇▇▇▇▇▇ Brothers Inc. on behalf of the Underwriters, it will not, during the 180-day Restricted Period, make any demand for, or exercise any right with respect to, the registration of any shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock. The Selling Shareholder consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of any Shares held by the Selling Shareholder except in compliance with the foregoing restrictions.

Notwithstanding the foregoing, if (1) during the last 17 days of the 180-day Restricted Period the Company issues an earnings release or material news or a material event relating to the Company occurs; or (2) prior to the expiration of the 180-day Restricted Period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the 180-day Restricted Period, the restrictions imposed by this agreement shall continue to apply until the expiration of the 18-day period beginning on the issuance of the earnings release or the occurrence of the material news or material event unless ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated and ▇▇▇▇▇▇ Brothers Inc. waives in writing such extension. The Company shall promptly notify ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated and ▇▇▇▇▇▇ Brothers Inc. of any earnings release, news or event that may give rise to an extension of the initial 180-day Restricted Period.

4. Terms of Public Offering. Sellers are advised by you that the Underwriters propose to make a public offering of their respective portions of the Shares as soon after the Registration Statement and this Agreement have become effective as in your judgment is advisable. The Sellers are further advised by you that the Shares are to be offered to the public initially at $ a share (the “Public Offering Price”) and to certain dealers selected by you at a price that represents a concession not in excess of $ a share under the Public Offering Price, and that any Underwriter may allow, and such dealers may reallow, a concession, not in excess of $ a share, to any Underwriter or to certain other dealers.

5. Payment and Delivery. Payment for the Firm Shares to be sold by each Seller shall be made to such Seller in Federal or other funds immediately available in New York City against delivery of such Firm Shares for the respective accounts of the several Underwriters at 10:00 a.m., New York City time, on , 2008, or at such other time on the same or such other date, not later than , 2008 [5 business days after date inserted above], as shall be designated in writing by you. The time and date of such payment are hereinafter referred to as the “Closing Date.”

Payment for any Additional Shares shall be made to the Selling Shareholder in Federal or other funds immediately available in New York City

against delivery of such Additional Shares for the respective accounts of the several Underwriters at 10:00 a.m., New York City time, on the date specified in the corresponding notice described in Section 3 or at such other time on the same or on such other date, in any event not later than , 2008 [10 business days after expiration of over-allotment option], as shall be designated in writing by you.

The Firm Shares and Additional Shares shall be registered in such names and in such denominations as you shall request in writing not later than one full business day prior to the Closing Date or the applicable Option Closing Date, as the case may be. The Firm Shares and Additional Shares shall be delivered to you on the Closing Date or an Option Closing Date, as the case may be, for the respective accounts of the several Underwriters, with any transfer taxes payable in connection with the transfer of the Shares to the Underwriters duly paid, against payment of the Purchase Price therefor.

6. Conditions to the Underwriters’ Obligations. The obligations of the Sellers to sell the Shares to the Underwriters and the several obligations of the Underwriters to purchase and pay for the Shares on the Closing Date are subject to the condition that the Registration Statement shall have become effective not later than [ ] (New York City time) on the date hereof.

The several obligations of the Underwriters are subject to the following further conditions:

(a) Subsequent to the execution and delivery of this Agreement and prior to the Closing Date:

(i) there shall not have occurred any downgrading, nor shall any notice have been given of any intended or potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded any of the securities of the Rhino Parties by any “nationally recognized statistical rating organization,” as such term is defined for purposes of Rule 436(g)(2) under the Securities Act; and

(ii) there shall not have occurred any change, or any development involving a prospective change, in the condition, financial or otherwise, or in the earnings, business or operations of the Rhino Entities, taken as a whole, from that set forth in the Time of Sale Prospectus as of the date of this Agreement that, in the judgment of ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated (“▇▇▇▇▇▇ ▇▇▇▇▇▇▇”), is material and adverse and that makes it, in the judgment of ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, impracticable to market the Shares on the terms and in the manner contemplated in the Time of Sale Prospectus.

(b) The Selling Shareholder and the investment funds managed by Wexford shall have contributed 100% of the ownership interests in Rhino Energy to the Company and the investment funds managed by Wexford and the Selling Shareholder shall have contributed their shares of the Company’s Common Stock to the Selling Shareholder as described in the Registration Statement.

(c) The Underwriters shall have received on the Closing Date a certificate, dated the Closing Date and signed by an executive officer of the Company, to the effect set forth in Section 6(a)(i) above and to the effect that the representations and warranties of the Rhino Parties contained in this Agreement are true and correct as of the Closing Date and that each of the Rhino Parties has complied with all of the agreements and satisfied all of the conditions on its part to be performed or satisfied hereunder on or before the Closing Date.

The officer signing and delivering such certificate may rely upon the best of his or her knowledge as to proceedings threatened.

(d) The Underwriters shall have received on the Closing Date an opinion of ▇▇▇▇▇▇ & ▇▇▇▇▇▇ L.L.P., outside counsel for the Company, dated the Closing Date, to the effect that:

(i) the Company has been duly incorporated, is validly existing as a corporation in good standing under the laws of the jurisdiction of its incorporation, has the corporate power and authority to own its property and to conduct its business as described in the Time of Sale Prospectus and is duly qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not have a material adverse effect on the Rhino Entities, taken as a whole;

(ii) each of Rhino Energy and the Rhino Subsidiaries is validly existing as a limited liability company in good standing under the laws of the jurisdiction of its formation, has the limited liability company power and authority to own its property and to conduct its business as described in the Time of Sale Prospectus and is duly qualified to transact business and is in good standing in each of the jurisdiction designated as a foreign state of qualification and listed next to the name of such subsidiary on Schedule A hereto (which jurisdiction the Company has represented to such counsel constitutes all jurisdictions in which the conduct of its business or its ownership or leasing of property requires such qualification), except to the extent that the failure to be so qualified or be in good standing would not have a material adverse effect on the Rhino Entities, taken as a whole;

(iii) the authorized capital stock of the Company conforms in all material respects as to legal matters to the description thereof contained in each of the Time of Sale Prospectus and the Prospectus;

(iv) the shares of Common Stock (including the Shares to be sold by the Selling Shareholder) outstanding prior to the issuance of the Shares to be sold by the Company have been duly authorized and are validly issued, fully paid and non-assessable;

(v) all of the issued limited liability company interests of each of the Rhino Subsidiaries have been duly and validly authorized and issued, are fully paid and non-assessable and are owned directly or indirectly by the Company, free and clear of all liens, encumbrances or claims in respect of which a UCC filing statement naming each such Rhino Subsidiary is on file as of a recent date in the office of the Secretary of State of the State of Delaware, without independent investigation, in each case other than liens, encumbrances or claims created by or arising under the Credit Agreement by and among CAM Holdings LLC, the Guarantors Party Thereto, the Lenders Party Thereto, PNC Bank, National Association, as Administrative Agent, PNC National Markets LLC and National City Bank as Joint Lead Arrangers, and Wachovia Bank, National Association, Royal Bank of Canada and ▇▇▇▇▇▇▇ ▇▇▇▇▇ Bank, FSB, as Co-Documentations Agents dated as of August 30, 2006 and as amended by first amendment dated December 28, 2006 and as amended by second amendment dated March 8, 2007 and as amended by third amendment dated February 29, 2008 and as amended by fourth amendment dated May 15, 2008 and to be amended by fifth amendment, which form is filed as an exhibit to the Registration Statement;

(vi) all of the issued limited liability company interests of Rhino Energy have been duly and validly authorized and issued, are fully paid and non-assessable (except as such non-assessability may be affected by Section 18-607 or 18-804 of the Delaware LLC Act) and are owned directly by the Company, free and clear of all liens, encumbrances, equities or claims in respect of which a UCC filing statement naming the Company is on file as of a recent date in the office of the Secretary of State of the State of Delaware or otherwise know to us, without independent investigation, in each case other than liens, encumbrances or claims created by or arising under the Credit Agreement;

(vii) the Shares to be sold by the Company have been duly authorized and, when issued and delivered in accordance with the terms of this Agreement, will be validly issued, fully paid and non-assessable, and the issuance of such Shares will not be subject to any preemptive or similar rights under the Amended and Restated Certificate of Incorporation of the Company, the Amended and Restated Bylaws of the

Company, the Delaware General Corporation Law or, any agreement filed as an exhibit to the Registration Statement;

(viii) this Agreement has been duly authorized, executed and delivered by each of the Rhino Parties;

(ix) the execution and delivery by each of the Rhino Parties of, and the performance by the Rhino Parties of their respective obligations under, this Agreement will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, (A) the Delaware General Corporation Law, the Delaware LLC Act and the federal laws of the United States (provided, however, that we express no opinion as to the application of federal anti-fraud laws), (B) any agreement or instrument filed as an exhibit to the Registration Statement or (C) the Restated Certificate of Incorporation of the Company or the Amended and Restated Bylaws of the Company or the organizational documents of Rhino Energy, and no consent, approval, authorization or order of, or qualification with, any governmental body or agency is required to be obtained or made by the Company for the performance by the Rhino Parties of their respective obligations under this Agreement, except (A) such as may be required by the securities or Blue Sky laws of the various states in connection with the offer and sale of the Shares, the Securities Act and the Exchange Act, (B) for such which have been obtained or made and (C) for such which, if not obtained, would not individually or in the aggregate, be reasonably expected to have a material adverse effect on the Rhino Parties, taken as a whole;

(x) the statements relating to legal matters or documents included in (A) the Time of Sale Prospectus and the Prospectus under the captions “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Liquidity and Capital Resources,” “Business — Legal Proceedings,” “Business — Regulation and Laws,” “Certain Relationships and Related Party Transactions,” “Description of Our Capital Stock,” “Shares Eligible for Future Sale,” and “Certain U.S. Federal Tax Considerations for Non-U.S. Holders,” (B) the Prospectus under the caption “Underwriting” and (C) the Registration Statement in Items 14 and 15, in each case fairly summarize in all material respects such matters, documents or proceedings;

(xi) after due inquiry, such counsel does not know of any legal or governmental proceedings pending or threatened to which any of the Rhino Entities is a party or to which any of the properties of the Rhino Entities is subject that are required to be described in the Registration Statement or the Prospectus and are not so described or of any statutes, regulations, contracts or other documents that are required to be described in the Registration Statement or the Prospectus or to be filed as exhibits to

the Registration Statement that are not described or filed as required by the Securities Act, the Exchange Act or any rules or regulations promulgated by the Commission thereunder;

(xii) Neither of the Rhino Parties is, and after giving effect to the offering and sale of the Shares and the application of the proceeds thereof as described in the Prospectus will not be, required to register as an “investment company” as such term is defined in the Investment Company Act of 1940, as amended; and

(xiii) (A) in the opinion of such counsel, the Registration Statement and the Prospectus (except for the financial statements and notes and financial schedules and other financial, statistical data and reserve and non-reserve deposit included therein, as to which such counsel need not express any opinion) appear on their face to comply as to form in all material respects to the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder, and (B) no facts have come to the attention of such counsel that leads such counsel to believe that (1) the Registration Statement (except for the financial statements and notes and financial schedules and other financial, statistical and reserve and non-reserve deposit data included therein, as to which such counsel need not express any belief) at the time the Registration Statement became effective contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (2) the Time of Sale Prospectus (except for the financial statements and notes and financial schedules and other financial, statistical and reserve and non-reserve deposit data included therein, as to which such counsel need not express any belief) as of the date of this Agreement included an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading or (3) the Prospectus (except for the financial statements and notes and financial schedules and other financial, statistical and reserve and non-reserve deposit data included therein, as to which such counsel need not express any belief) as of its date or as amended or supplemented, if applicable, as of the Closing Date included an untrue statement of a material fact or omitted or omits to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

(e) The Underwriters shall have received on the Closing Date an opinion of ▇▇▇▇▇▇ & ▇▇▇▇▇▇ L.L.P., counsel for the Selling Shareholder, dated the Closing Date, to the effect that:

(i) this Agreement has been duly authorized, executed and delivered by or on behalf of each of the Selling Shareholder;

(ii) the execution and delivery by the Selling Shareholder of, and the performance by the Selling Shareholder of its obligations under, this Agreement will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, the Delaware LLC Act and the federal laws of the United States (provided, however, that we express no opinion as to the application of federal anti-fraud laws) or the limited liability company agreement of the Selling Shareholder, and no consent, approval, authorization or order of, or qualification with, any governmental body or agency is required to be obtained or made by the Selling Shareholder for the performance by the Selling Shareholder of its obligations under this Agreement, except (A) such as may be required by the securities or Blue Sky laws of the various states in connection with offer and sale of the Shares, the Securities Act and the Exchange Act, (B) for such which have been obtained or made and (C) for such which if not obtained, would not individually or in the aggregate, be reasonably expected to have a material adverse effect on the Selling Shareholder;

(iii) the Selling Shareholder has valid title to, or a valid security entitlement in respect of, the Shares to be sold by the Selling Shareholder free and clear of all security interests, claims, liens, equities and other encumbrances, and the Selling Shareholder has the legal right and power, and all authorization and approval required by law, to enter into this Agreement and to sell, transfer and deliver the Shares to be sold by the Selling Shareholder or a security entitlement in respect of such Shares;

(iv) upon payment for the Shares to be sold by the Selling Shareholder pursuant to this Agreement, delivery of such Shares, as directed by the Underwriters, to Cede or such other nominee as may be designated by DTC, registration of such Shares in the name of Cede or such other nominee and the crediting of such Shares on the books of DTC to securities accounts of the Underwriters (assuming that neither DTC nor any such Underwriter has notice of any adverse claim within the meaning of Section 8-105 of the UCC to such Shares), (A) DTC shall be a “protected purchaser” of such Shares within the meaning of Section 8-303 of the UCC, (B) under Section 8-501 of the UCC, the Underwriters will acquire a valid security entitlement in respect of such Shares and (C) no action based on any “adverse claim” (within the meaning of Section 8-102 of the UCC) to such Shares may be asserted against the Underwriters with respect to such security entitlement; in giving this opinion, counsel for the Selling Shareholder may assume that when such payment, delivery and crediting occur, (x) such Shares will have been registered in the name of Cede or another nominee designated by DTC, in each case on the Company’s share registry in accordance with its certificate of incorporation, bylaws and applicable law, (y) DTC will be registered as a “clearing corporation” within the meaning of Section 8-102 of the UCC

and (z) appropriate entries to the accounts of the several Underwriters on the records of DTC will have been made pursuant to the UCC; and

(f) The Underwriters shall have received on the Closing Date an opinion of ▇▇▇▇▇▇▇ ▇▇▇▇▇ LLP, counsel for the Underwriters, dated the Closing Date, covering the matters referred to in Sections 6(d)(vii), 6(d)(viii), 6(d)(x) (but only as to the statements in each of the Time of Sale Prospectus and the Prospectus under “Description of Our Capital Stock” and “Underwriting”) and 6(d)(xiii) above.

With respect to Sections 6(d)(xiii) and 6(e)(vi) above, ▇▇▇▇▇▇ & ▇▇▇▇▇▇ L.L.P. and ▇▇▇▇▇▇▇ ▇▇▇▇▇ LLP may state that their opinions and beliefs are based upon their participation in the preparation of the Registration Statement, the Time of Sale Prospectus and the Prospectus and any amendments or supplements thereto and review and discussion of the contents thereof, but are without independent check or verification, except as specified. With respect to Section 6(e) above, ▇▇▇▇▇▇ & ▇▇▇▇▇▇ L.L.P. may rely upon an opinion or opinions of counsel for the Selling Shareholder and, with respect to factual matters and to the extent such counsel deems appropriate, upon the representations of the Selling Shareholder contained herein and in other documents and instruments; provided that (A) the counsel for the Selling Shareholder is satisfactory to your counsel, (B) a copy of each opinion so relied upon is delivered to you and is in form and substance satisfactory to your counsel, (C) copies of any such other documents and instruments shall be delivered to you and shall be in form and substance satisfactory to your counsel and (D) ▇▇▇▇▇▇ & ▇▇▇▇▇▇ L.L.P. shall state in their opinion that they are justified in relying on each such other opinion.

The opinions of ▇▇▇▇▇▇ & ▇▇▇▇▇▇ L.L.P. described in Sections 6(d) and 6(e) above (and any opinions of counsel for the Selling Shareholder referred to in the immediately preceding paragraph) shall be rendered to the Underwriters at the request of the Company or the Selling Shareholder, as the case may be, and shall so state therein.

(g) The Underwriters shall have received, on each of the date hereof and the Closing Date, a letter dated the date hereof or the Closing Date, as the case may be, in form and substance satisfactory to the Underwriters, from Deloitte & Touche LLP, independent public accountants, containing statements and information of the type ordinarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement, the Time of Sale Prospectus and the Prospectus; provided that the letter delivered on the Closing Date shall use a “cut-off date” not earlier than the date hereof.

(h) The “lock-up” agreements, each substantially in the form of Exhibit A hereto, between you and certain shareholders, officers and directors of the Company relating to sales and certain other dispositions of shares of Common

Stock or certain other securities, delivered to you on or before the date hereof, shall be in full force and effect on the Closing Date.

The several obligations of the Underwriters to purchase Additional Shares hereunder are subject to the delivery to you on the applicable Option Closing Date of such documents as you may reasonably request with respect to the good standing of the Company, the due authorization and to sell the Additional Shares to be sold on such Option Closing Date and other matters related to the issuance of such Additional Shares.

7. Covenants of the Rhino Parties. Each of the Rhino Parties, jointly and severally, covenants with each Underwriter as follows:

(a) To furnish to you, without charge, copies of the Registration Statement (including exhibits thereto) and for delivery to each other Underwriter a conformed copy of the Registration Statement (without exhibits thereto) and to furnish to you in New York City, without charge, prior to 10:00 a.m. New York City time on the business day next succeeding the date of this Agreement and during the period mentioned in Section 7 (e) or 7(f) below, as many copies of the Time of Sale Prospectus, the Prospectus and any supplements and amendments thereto or to the Registration Statement as you may reasonably request.

(b) Before amending or supplementing the Registration Statement, the Time of Sale Prospectus or the Prospectus, to furnish to you a copy of each such proposed amendment or supplement and not to file any such proposed amendment or supplement to which ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ reasonably objects, and to file with the Commission within the applicable period specified in Rule 424(b) under the Securities Act any prospectus required to be filed pursuant to such Rule.

(c) To furnish to you a copy of each proposed free writing prospectus including electronic road shows to be prepared by or on behalf of, used by, or referred to by the Company and not to use or refer to any proposed free writing prospectus to which ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ reasonably objects.

(d) Not to take any action that would result in an Underwriter or the Company being required to file with the Commission pursuant to Rule 433(d) under the Securities Act a free writing prospectus prepared by or on behalf of the Underwriter that the Underwriter otherwise would not have been required to file thereunder.

(e) If the Time of Sale Prospectus is being used to solicit offers to buy the Shares at a time when the Prospectus is not yet available to prospective purchasers and any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Time of Sale Prospectus in order to make the statements therein, in the light of the circumstances, not misleading, or if any event shall occur or condition exist as a result of which the Time of Sale

Prospectus conflicts with the information contained in the Registration Statement then on file, or if, in the opinion of counsel for the Underwriters, it is necessary to amend or supplement the Time of Sale Prospectus to comply with applicable law, forthwith to prepare, file with the Commission and furnish, at its own expense, to the Underwriters and to any dealer upon request, either amendments or supplements to the Time of Sale Prospectus so that the statements in the Time of Sale Prospectus as so amended or supplemented will not, in the light of the circumstances when the Time of Sale Prospectus is delivered to a prospective purchaser, be misleading or so that the Time of Sale Prospectus, as amended or supplemented, will no longer conflict with the Registration Statement, or so that the Time of Sale Prospectus, as amended or supplemented, will comply with applicable law.

(f) If, during such period after the first date of the public offering of the Shares as in the opinion of counsel for the Underwriters the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is required by law to be delivered in connection with sales by an Underwriter or dealer, any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Prospectus in order to make the statements therein, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is delivered to a purchaser, not misleading, or if, in the opinion of counsel for the Underwriters, it is necessary to amend or supplement the Prospectus to comply with applicable law, forthwith to prepare, file with the Commission and furnish, at its own expense, to the Underwriters and to the dealers (whose names and addresses you will furnish to the Company) to which Shares may have been sold by you on behalf of the Underwriters and to any other dealers upon request, either amendments or supplements to the Prospectus so that the statements in the Prospectus as so amended or supplemented will not, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is delivered to a purchaser, be misleading or so that the Prospectus, as amended or supplemented, will comply with applicable law.

(g) To endeavor to qualify the Shares for offer and sale under the securities or Blue Sky laws of such jurisdictions as you shall reasonably request.

(h) To make generally available to the Company’s security holders and to you as soon as practicable an earning statement covering a period of at least twelve months beginning with the first fiscal quarter of the Company occurring after the date of this Agreement which shall satisfy the provisions of Section 11(a) of the Securities Act and the rules and regulations of the Commission thereunder.

(i) Whether or not the transactions contemplated in this Agreement are consummated or this Agreement is terminated, the Company agrees to pay or cause to be paid all expenses incident to the performance of the obligations of

Sellers under this Agreement, including: (i) the fees, disbursements and expenses of the counsel for the Rhino Parties and Selling Shareholder and the Rhino Parties’ accountants in connection with the registration and delivery of the Shares under the Securities Act and all other fees or expenses in connection with the preparation and filing of the Registration Statement, any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, any free writing prospectus prepared by or on behalf of, used by, or referred to by the Company and amendments and supplements to any of the foregoing, including all printing costs associated therewith, and the mailing and delivering of copies thereof to the Underwriters and dealers, in the quantities hereinabove specified, (ii) all costs and expenses related to the transfer and delivery of the Shares to the Underwriters, including any transfer or other taxes payable thereon, (iii) the cost of printing or producing any Blue Sky or Legal Investment memorandum in connection with the offer and sale of the Shares under state securities laws and all expenses in connection with the qualification of the Shares for offer and sale under state securities laws as provided in Section 7(g) hereof, including filing fees and the reasonable fees and disbursements of counsel for the Underwriters in connection with such qualification and in connection with the Blue Sky or Legal Investment memorandum, (iv) all filing fees and the reasonable fees and disbursements of counsel to the Underwriters incurred in connection with the review and qualification of the offering of the Shares by the Financial Industry Regulatory Authority and any counsel fees incurred on behalf of or disbursements by ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ in its capacity as “qualified independent underwriter”, (v) all fees and expenses in connection with the preparation and filing of the registration statement on Form 8-A relating to the Common Stock and all costs and expenses incident to listing the Shares on the New York Stock Exchange, (vi) the cost of printing certificates representing the Shares, (vii) the costs and charges of any transfer agent, registrar or depositary, (viii) the costs and expenses of the Company relating to investor presentations on any “road show” undertaken in connection with the marketing of the offering of the Shares, including, without limitation, expenses associated with the preparation or dissemination of any electronic road show, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations with the prior approval of the Rhino Parties, travel and lodging expenses of the representatives and officers of the Rhino Parties and any such consultants, and the cost of any aircraft chartered in connection with the road show, (ix) the document production charges and expenses associated with printing this Agreement and (x) all other costs and expenses incident to the performance of the obligations of the Rhino Parties hereunder for which provision is not otherwise made in this Section. It is understood, however, that except as provided in this Section, Section 9 entitled “Indemnity and Contribution” and the last paragraph of Section 11 below, the Underwriters will pay all of their costs and expenses, including fees and disbursements of their counsel, stock transfer taxes payable on resale of any of the Shares by them and any advertising expenses connected with any offers they may make.

8. Covenants of the Underwriters. Each Underwriter severally covenants with the Company not to take any action that would result in the Company being required to file with the Commission under Rule 433(d) a free writing prospectus prepared by or on behalf of such Underwriter that otherwise would not be required to be filed by the Company thereunder, but for the action of the Underwriter.

9. Indemnity and Contribution. (a) Sellers, jointly and severally, agree to indemnify and hold harmless each Underwriter, each person, if any, who controls any Underwriter within the meaning of either Section 15 of the Securities Act or Section 20 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and each affiliate of any Underwriter within the meaning of Rule 405 under the Securities Act from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) caused by any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or any amendment thereof, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus as defined in Rule 433(h) under the Securities Act, any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act, or the Prospectus or any amendment or supplement thereto, or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading, except insofar as such losses, claims, damages or liabilities are caused by any such untrue statement or omission or alleged untrue statement or omission based upon information relating to any Underwriter furnished to the Company in writing by such Underwriter through you expressly for use therein.

(b) The Selling Shareholder agrees to indemnify and hold harmless each Underwriter, and each person, if any, who controls the Company within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act, from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) caused by any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or any amendment thereof, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus as defined in Rule 433(h) under the Securities Act, any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act, or the Prospectus or any amendment or supplement thereto, or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, but only with reference to information relating to the Selling Shareholder furnished in writing by or on behalf of the Selling Shareholder

expressly for use in the Registration Statement, any preliminary prospectus, the Prospectus or any amendment or supplement thereto.

(c) Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company, the Selling Shareholder, the directors of the Company, the officers of the Company who sign the Registration Statement and each person, if any, who controls the Company or the Selling Shareholder within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) caused by any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or any amendment thereof, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus as defined in Rule 433(h) under the Securities Act, any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act, or the Prospectus (as amended or supplemented if the Company shall have furnished any amendments or supplements thereto), or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein in light of the circumstances under which they were made not misleading, but only with reference to information relating to such Underwriter furnished to the Company in writing by such Underwriter through you expressly for use in the Registration Statement, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus or the Prospectus or any amendment or supplement thereto.

(d) In case any proceeding (including any governmental investigation) shall be instituted involving any person in respect of which indemnity may be sought pursuant to Section 9(a) or 9(b), such person (the “indemnified party”) shall promptly notify the person against whom such indemnity may be sought (the “indemnifying party”) in writing and the indemnifying party, upon request of the indemnified party, shall retain counsel reasonably satisfactory to the indemnified party to represent the indemnified party and any others the indemnifying party may designate in such proceeding and shall pay the fees and disbursements of such counsel related to such proceeding. In any such proceeding, any indemnified party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such indemnified party unless (i) the indemnifying party and the indemnified party shall have mutually agreed to the retention of such counsel or (ii) the named parties to any such proceeding (including any impleaded parties) include both the indemnifying party and the indemnified party and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. It is understood that the indemnifying party shall not, in respect of the legal expenses of any indemnified party in connection with any proceeding or related proceedings in the same jurisdiction, be liable for (i) the fees and expenses of more than one separate firm (in addition to any local counsel) for all Underwriters

and all persons, if any, who control any Underwriter within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act or who are affiliates of any Underwriter within the meaning of Rule 405 under the Securities Act, (ii) the fees and expenses of more than one separate firm (in addition to any local counsel) for the Company, its directors, its officers who sign the Registration Statement and each person, if any, who controls the Company within the meaning of either such Section and (iii) the fees and expenses of more than one separate firm (in addition to any local counsel) for the Selling Shareholder and all persons, if any, who control the Selling Shareholder within the meaning of either such Section and that all such fees and expenses shall be reimbursed as they are incurred. In the case of any such separate firm for the Underwriters and such control persons and affiliates of any Underwriters, such firm shall be designated in writing by ▇▇▇▇▇▇ ▇▇▇▇▇▇▇. In the case of any such separate firm for the Company, and such directors, officers and control persons of the Company, such firm shall be designated in writing by the Company. In the case of any such separate firm for the Selling Shareholder and such control persons of any Selling Shareholder, such firm shall be designated in writing by the persons named as attorneys-in-fact for the Selling Shareholder under the Powers of Attorney. The indemnifying party shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party from and against any loss or liability by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel as contemplated by the second and third sentences of this paragraph, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party in accordance with such request prior to the date of such settlement. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened proceeding in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party, unless such settlement includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such proceeding.

(e) To the extent the indemnification provided for in Section 9(a) or 9(b) is unavailable to an indemnified party or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then each indemnifying party under such paragraph, in lieu of indemnifying such indemnified party thereunder, shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (i) in such proportion as is appropriate to reflect the relative benefits received by the indemnifying party or

parties on the one hand and the indemnified party or parties on the other hand from the offering of the Shares or (ii) if the allocation provided by clause 9(e)(i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause 9(e)(i) above but also the relative fault of the indemnifying party or parties on the one hand and of the indemnified party or parties on the other hand in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the Sellers on the one hand and the Underwriters on the other hand in connection with the offering of the Shares shall be deemed to be in the same respective proportions as the net proceeds from the offering of the Shares (before deducting expenses) received by each Seller and the total underwriting discounts and commissions received by the Underwriters, in each case as set forth in the table on the cover of the Prospectus, bear to the aggregate Public Offering Price of the Shares. The relative fault of the Sellers on the one hand and the Underwriters on the other hand shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Sellers or by the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The Underwriters’ respective obligations to contribute pursuant to this Section 9 are several in proportion to the respective number of Shares they have purchased hereunder, and not joint.

(f) The Sellers also agree to indemnify and hold harmless ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ and each person, if any, who controls ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ within the meaning of either Section 15 of the Act, or Section 20 of the Exchange Act, from and against any and all losses, claims, damages, liabilities and judgments incurred as a result of ▇▇▇▇▇▇ ▇▇▇▇▇▇▇’▇ participation as a “qualified independent underwriter” within the meaning of Rule 2720 of the National Association of Securities Dealers’ Conduct Rules in connection with the offering of the Shares, except for any losses, claims, damages, liabilities, and judgments resulting from ▇▇▇▇▇▇ ▇▇▇▇▇▇▇’▇, or such controlling person’s, willful misconduct.

(g) Notwithstanding anything contained herein to the contrary, if indemnity may be sought pursuant to Section 9(f) hereof in respect of such action or proceeding, then in addition to such separate firm for the indemnified parties, the indemnifying party shall be liable for the reasonable fees and expenses of not more than one separate firm (in addition to any local counsel) for ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ in its capacity as a “qualified independent underwriter” and all persons, if any, who control ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ within the meaning of either Section 15 of the Act or Section 20 of the Exchange Act.

(h) The Sellers and the Underwriters agree that it would not be just or equitable if contribution pursuant to this Section 9 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose)

or by any other method of allocation that does not take account of the equitable considerations referred to in Section 9(e). The amount paid or payable by an indemnified party as a result of the losses, claims, damages and liabilities referred to in Section 9(e) shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 9, no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Shares underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages that such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The remedies provided for in this Section 9 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

(i) The indemnity and contribution provisions contained in this Section 9 and the representations, warranties and other statements of the Company and the Selling Shareholder contained in this Agreement shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of any Underwriter, any person controlling any Underwriter or any affiliate of any Underwriter, the Selling Shareholder or any person controlling the Selling Shareholder, or the Company, its officers or directors or any person controlling the Company and (iii) acceptance of and payment for any of the Shares.

10. Termination. The Underwriters may terminate this Agreement by notice given by you to the Company, if after the execution and delivery of this Agreement and prior to the Closing Date (i) trading generally shall have been suspended or materially limited on, or by, as the case may be, any of the New York Stock Exchange, the NASDAQ Global Market, or other relevant exchanges, (ii) trading of any securities of the Company shall have been suspended on any exchange or in any over-the-counter market, (iii) a material disruption in securities settlement, payment or clearance services in the United States shall have occurred, (iv) any moratorium on commercial banking activities shall have been declared by Federal or New York State authorities or (v) there shall have occurred any outbreak or escalation of hostilities, or any change in financial markets or any calamity or crisis that, in the judgment of ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, is material and adverse and which, singly or together with any other event specified in this clause (v), makes it, in the judgment of ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, impracticable or inadvisable to proceed with the offer, sale or delivery of the Shares on the terms and in the manner contemplated in the Time of Sale Prospectus or the Prospectus.

11. Effectiveness; Defaulting Underwriters. This Agreement shall become effective upon the execution and delivery hereof by the parties hereto.

If, on the Closing Date or an Option Closing Date, as the case may be, any one or more of the Underwriters shall fail or refuse to purchase Shares that it has or they have agreed to purchase hereunder on such date, and the aggregate number of Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase is not more than one-tenth of the aggregate number of the Shares to be purchased on such date, the other Underwriters shall be obligated severally in the proportions that the number of Firm Shares set forth opposite their respective names in Schedule I hereto bears to the aggregate number of Firm Shares set forth opposite the names of all such non-defaulting Underwriters, or in such other proportions as you may specify, to purchase the Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase on such date; provided that in no event shall the number of Shares that any Underwriter has agreed to purchase pursuant to this Agreement be increased pursuant to this Section 11 by an amount in excess of one-ninth of such number of Shares without the written consent of such Underwriter. If, on the Closing Date, any Underwriter or Underwriters shall fail or refuse to purchase Firm Shares and the aggregate number of Firm Shares with respect to which such default occurs is more than one-tenth of the aggregate number of Firm Shares to be purchased on such date, and arrangements satisfactory to you, the Company and the Selling Shareholder for the purchase of such Firm Shares are not made within 36 hours after such default, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter, the Company or the Selling Shareholder. In any such case either you or the relevant Sellers shall have the right to postpone the Closing Date, but in no event for longer than seven days, in order that the required changes, if any, in the Registration Statement, in the Time of Sale Prospectus, in the Prospectus or in any other documents or arrangements may be effected. If, on an Option Closing Date, any Underwriter or Underwriters shall fail or refuse to purchase Additional Shares and the aggregate number of Additional Shares with respect to which such default occurs is more than one-tenth of the aggregate number of Additional Shares to be purchased on such Option Closing Date, the non-defaulting Underwriters shall have the option to (i) terminate their obligation hereunder to purchase the Additional Shares to be sold on such Option Closing Date or (ii) purchase not less than the number of Additional Shares that such non-defaulting Underwriters would have been obligated to purchase in the absence of such default. Any action taken under this paragraph shall not relieve any defaulting Underwriter from liability in respect of any default of such Underwriter under this Agreement.

If this Agreement shall be terminated by the Underwriters, or any of them, because of any failure or refusal on the part of the Rhino Parties or the Selling Shareholder to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Rhino Parties or the Selling Shareholder shall be unable to perform their respective obligations under this Agreement, the Rhino

Parties and the Selling Shareholder will reimburse the Underwriters or such Underwriters as have so terminated this Agreement with respect to themselves, severally, for all out-of-pocket expenses (including the fees and disbursements of their counsel) reasonably incurred by such Underwriters in connection with this Agreement or the offering contemplated hereunder.

12. Entire Agreement. (a) This Agreement, together with any contemporaneous written agreements and any prior written agreements (to the extent not superseded by this Agreement) that relate to the offering of the Shares, represents the entire agreement between the Rhino Parties and the Selling Shareholder, on the one hand, and the Underwriters, on the other, with respect to the preparation of any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, the conduct of the offering, and the purchase and sale of the Shares.

(b) Each of the Rhino Parties acknowledges that in connection with the offering of the Shares: (i) the Underwriters have acted at arms length, are not agents of, and owe no fiduciary duties to, the Rhino Parties or any other person, (ii) the Underwriters owe the Rhino Parties only those duties and obligations set forth in this Agreement and prior written agreements (to the extent not superseded by this Agreement), if any, and (iii) the Underwriters may have interests that differ from those of the Rhino Parties. Each of the Rhino Parties waives to the full extent permitted by applicable law any claims it may have against the Underwriters arising from an alleged breach of fiduciary duty in connection with the offering of the Shares.

13. Counterparts. This Agreement may be signed in two or more counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

14. Applicable Law. This Agreement shall be governed by and construed in accordance with the internal laws of the State of New York.

15. Headings. The headings of the sections of this Agreement have been inserted for convenience of reference only and shall not be deemed a part of this Agreement.

16. Notices. All communications hereunder shall be in writing and effective only upon receipt and if to the Underwriters shall be delivered, mailed or sent to you in care of ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated, ▇▇▇▇ ▇▇▇▇▇▇▇▇, ▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇, Attention: Equity Syndicate Desk, with a copy to the Legal Department; and if to either or both of the Rhino Parties shall be delivered, mailed or sent to address of the Company set forth in the Registration Statement and if to the Selling Shareholder shall be delivered, mailed or sent to Rhino Energy Holdings LLC, c/o Wexford Capital LLC, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇, Attention: General Counsel.

	Very truly yours,

	RHINO RESOURCES, INC.


	By:
		Name:
		Title:


	RHINO ENERGY LLC


	Name:
	Title:


	RHINO ENERGY HOLDINGS LLC


	Name:
	Title:

Accepted as of the date hereof

▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated

▇▇▇▇▇▇ Brothers Inc.

▇▇▇▇▇▇▇ ▇▇▇▇▇ & Associates, Inc.

RBC Capital Markets Corporation
▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇ & Company, Incorporated

Wachovia Capital Markets, LLC

▇▇▇▇▇▇▇ ▇▇▇▇ & Company, LLC

▇▇▇▇▇▇▇▇▇ & Company LLC

Friedman, Billings, ▇▇▇▇▇▇ & Co., Inc.

PNC Capital Markets LLC

Acting severally on behalf of themselves and the several Underwriters named in Schedule I hereto.

By: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated

By:
	Name:
	Title:

SCHEDULE I

Underwriter		Number of Firm Shares To Be Purchased

▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated
▇▇▇▇▇▇ Brothers Inc.
▇▇▇▇▇▇▇ ▇▇▇▇▇ & Associates, Inc
RBC Capital Markets Corporation
▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇ & Company, Incorporated
Wachovia Capital Markets, LLC
▇▇▇▇▇▇▇ ▇▇▇▇ & Company, LLC
▇▇▇▇▇▇▇▇▇ & Company LLC
Friedman, Billings, ▇▇▇▇▇▇ & Co., Inc
PNC Capital Markets LLC

Total:

I-1

SCHEDULE II

Time of Sale Prospectus

1. Preliminary Prospectus filed with the Commission on [date]

2. [identify all free writing prospectuses filed by the Company under Rule 433(d) of the Securities Act]

3. [free writing prospectus containing a description of terms that does not reflect final terms, if the Time of Sale Prospectus does not include a final term sheet]

4. [orally communicated pricing information to be included on Schedule II if a final term sheet is not used] [to be discussed]

II-1

EXHIBIT A

[FORM OF LOCK-UP LETTER]

, 2008

▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated
▇▇▇▇▇▇ Brothers Inc.

▇▇▇▇▇▇▇ ▇▇▇▇▇ & Associates, Inc.

RBC Capital Markets Corporation

▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇ & Company, Incorporated

Wachovia Capital Markets, LLC

▇▇▇▇▇▇▇ ▇▇▇▇ & Company, LLC

▇▇▇▇▇▇▇▇▇ & Company LLC

Friedman, Billings, ▇▇▇▇▇▇ & Co., Inc.

PNC Capital Markets LLC

c/o Morgan ▇▇▇▇▇▇▇ & Co. Incorporated
▇▇▇▇ ▇▇▇▇▇▇▇▇
▇▇▇ ▇▇▇▇, ▇▇ ▇▇▇▇▇

Ladies and Gentlemen:

The undersigned understands that ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. Incorporated and ▇▇▇▇▇▇ Brothers Inc. (together, the “Representatives”) propose to enter into an Underwriting Agreement (the “Underwriting Agreement”) with Rhino Resources, Inc., a [Delaware] corporation (the “Company”), providing for the public offering (the “Public Offering”) by the several Underwriters, including the Representatives (the “Underwriters”), of shares (the “Shares”) of the Common Stock, par value $0.01 per share, of the Company (the “Common Stock”).

To induce the Underwriters that may participate in the Public Offering to continue their efforts in connection with the Public Offering, the undersigned hereby agrees that, without the prior written consent of the Representatives on behalf of the Underwriters, it will not, during the period commencing on the date of the Underwriting Agreement and ending 180 days after the date of the final prospectus relating to the Public Offering (the “Prospectus”), (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock or (2) enter into any swap or other arrangement that transfers to

A-1

another, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise. The foregoing sentence shall not apply to (a) transactions relating to shares of Common Stock or other securities acquired in open market transactions after the completion of the Public Offering, provided that no filing under Section 16(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), shall be required or shall be voluntarily made in connection with subsequent sales of Common Stock or other securities acquired in such open market transactions, (b) transfers of shares of Common Stock or any security convertible into Common Stock as a bona fide gift, or (c) distributions of shares of Common Stock or any security convertible into Common Stock to limited partners, members or stockholders of the undersigned; provided that in the case of any transfer or distribution pursuant to clause (b) or (c), (i) each donee or distributee shall sign and deliver a lock-up letter substantially in the form of this letter and (ii) no filing under Section 16(a) of the Exchange Act, reporting a reduction in beneficial ownership of shares of Common Stock, shall be required or shall be voluntarily made during the restricted period referred to in the foregoing sentence, or (d) the establishment of a trading plan pursuant to Rule 10b5-1 under the Exchange Act for the transfer of shares of Common Stock, provided that such plan does not provide for the transfer of Common Stock during the restricted period. In addition, the undersigned agrees that, without the prior written consent of the Representatives on behalf of the Underwriters, it will not, during the period commencing on the date hereof and ending 180 days after the date of the Prospectus, make any demand for or exercise any right with respect to, the registration of any shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock. The undersigned also agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of the undersigned’s shares of Common Stock except in compliance with the foregoing restrictions.

If:

(1) during the last 17 days of the restricted period the Company issues an earnings release or material news or a material event relating to the Company occurs; or

(2) prior to the expiration of the restricted period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the restricted period;

the restrictions imposed by this agreement shall continue to apply until the expiration of the 18-day period beginning on the issuance of the earnings release or the occurrence of the material news or material event, unless the Representatives waive, in writing, such extension.

A-2

The undersigned shall not engage in any transaction that may be restricted by this agreement during the 34-day period beginning on the last day of the restricted period unless the undersigned requests and receives prior written confirmation from the Company or the Representatives that the restrictions imposed by this agreement have expired.

The undersigned understands that the Company and the Underwriters are relying upon this agreement in proceeding toward consummation of the Public Offering. The undersigned further understands that this agreement is irrevocable and shall be binding upon the undersigned’s heirs, legal representatives, successors and assigns.

Whether or not the Public Offering actually occurs depends on a number of factors, including market conditions. Any Public Offering will only be made pursuant to an Underwriting Agreement, the terms of which are subject to negotiation between the Company and the Underwriters.

	Very truly yours,



	(Name)


	(Address)

A-3

Shares Rhino Resources, Inc. Common Stock (Par Value $0.01 Per Share) UNDERWRITING AGREEMENT

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