Exhibit 99

Form 3 Joint Filer Information

Name:	YORKTOWN ENERGY PARTNERS VI, LP
Address:	410 PARK AVENUE, 19TH FLOOR
	NEW YORK, NY 10022-4407
Designated Filer:	YORKTOWN VI COMPANY LP
Issuer & Ticket Symbol:	CONCHO RESOURCES INC. [CXO]
Date of Event Requiring Statement:	08/01/2007
Signature:	YORKTOWN ENERGY PARTNERS VI, LP
	By:	Yorktown VI Company LP,
		its general partner
	By:	Yorktown VI Associates LLC,
		its general partner
	By:	/s/ W. Howard Keenan, Jr.
	Manager