ALUMINUM CORPORATION OF CHINA No. 62 North Xizhmen Street 10082 Beijing, China

Exhibit 99.(a)(4)

ALUMINUM CORPORATION OF CHINA
Xx. 00 Xxxxx Xxxxxxx Xxxxxx
00000 Xxxxxxx, Xxxxx

VIA FACSIMILE

June 14, 2007

Peru Copper Inc.
Suite 0000-000 Xxxx Xxxxxx
Xxxxxxxxx, Xxxxxxx Xxxxxxxx
X0X 0X0

ATTENTION: X. Xxxxx Xxxxxx

Dear Sir:

Reference is made to the Support Agreement, dated as of June 10, 2007 between Peru Copper Inc. and Aluminum Corporation of China.

Pursuant to Section 10.10 of the Support Agreement, we hereby give notice of the designation of Chinalco Canada B.C. Holdings Ltd., a British Columbia corporation and a direct wholly-owned subsidiary of Chinalco, as a party to the Support Agreement and to be deemed the “Offeror” thereunder.

		Sincerely,
		ALUMINUM CORPORATION OF CHINA
		By:	/s/ Xxxx Xxxxxx
			Name: Xxxx Xxxxxx
			Title: President

The undersigned confirms and agrees to be bound by the terms of the Support Agreement as of the date hereof and shall have all the rights and obligations as the Offeror thereunder.

		CHINALCO CANADA B.C. HOLDINGS LTD.
		By:	/s/ Xxxx Xxxxxxxx
			Name: Xxxx Xxxxxxxx
			Title: Director

Acknowledged by Peru Copper Inc.

Per:	/s/ X. Xxxxx Xxxxxx
	Name: X. Xxxxx Xxxxxx
	Title:
cc:	Xxxx Xxxxx (Xxxxxxx Xxxxx & Xxxxxxxxx LLP)
	Xxxxxx X. Xxxxxx (Xxxxxx & Xxxxxx LLP)
	Xxxxx Xxx (XxXxxxxx Xxxxxxxx LLP)