Exhibit 10.23 SECOND OVERRIDING ROYALTY AGREEMENT THIS AGREEMENT dated as of the 20th day of December, 2001 BETWEEN: GREYWOLF EXPLORATION INC., having an office in Calgary, Alberta (hereinafter called "Greywolf")Second Overriding Royalty Agreement • April 5th, 2002 • Abraxas Petroleum Corp • Crude petroleum & natural gas • Alberta
Contract Type FiledApril 5th, 2002 Company Industry Jurisdiction