Contract

EXHIBIT 4 --JOINT FILING AGREEMENT

The undersigned reporting persons hereby agree that the statements filed pursuant to this Schedule 13D, to which this Agreement is filed as an exhibit, are filed on behalf of each of them.

Date: June 3, 2004		PETROHAWK ENERGY, LLC
		By:		/s/ Xxxxx X. Xxxxxx
				Xxxxx X. Xxxxxx, President and Chief Executive Officer
Date: June 3, 2004		ENCAP ENERGY CAPITAL FUND IV, L.P.
		By:		EnCap Equity Fund IV GP, L.P., its general partner
		By:		EnCap Investments L.P., its general partner
		By:		EnCap Investments GP, L.L.C., its general partner
		By:		/s/ Xxxxx X. Xxxxxx
				Xxxxx X. Xxxxxx, Senior Managing Director
Date: June 3, 2004		ENCAP ENERGY CAPITAL FUND IV-B, L.P.
		By:		EnCap Equity Fund IV GP, L.P., its general partner
		By:		EnCap Investments L.P., its general partner
		By:		EnCap Investments GP, L.L.C., its general partner
		By:		/s/ Xxxxx X. Xxxxxx
				Xxxxx X. Xxxxxx, Senior Managing Director
Date: June 3, 2004		ENCAP EQUITY FUND IV GP, L.P.
		By:		EnCap Investments L.P., its general partner
		By:		EnCap Investments GP, L.L.C., its general partner
		By:		/s/ Xxxxx X. Xxxxxx
				Xxxxx X. Xxxxxx, Senior Managing Director
Date: June 3, 2004		ENCAP INVESTMENTS L.P.
		By:		EnCap Investments GP, L.L.C., its general partner
		By:		/s/ Xxxxx X. Xxxxxx
				Xxxxx X. Xxxxxx, Senior Managing Director

Date: June 3, 2004		ENCAP INVESTMENTS GP, L.L.C.
		By:		/s/ Xxxxx X. Xxxxxx
				Xxxxx X. Xxxxxx, Senior Managing Director
Date: June 3, 2004		RNBD GP LLC
		By:		/s/ Xxxxx X. Xxxxxx
				Xxxxx X. Xxxxxx, Senior Managing Director
Date: June 3, 2004		/s/ Xxxxx X. Xxxxxx
		XXXXX X. XXXXXX
Date: June 3, 2004		/s/ D. Xxxxxx Xxxxxxxx
		D. Xxxxxx Xxxxxxxx
Date: June 3, 2004		/s/ Xxxx X. Xxxxxxxx
		Xxxx X. Xxxxxxxx
Date: June 3, 2004		/s/ Xxxxxx X. Xxxxxx
		Xxxxxx X. Xxxxxx
Date: June 3, 2004		FCW, LLC
		By:		/s/ Xxxxx X. Xxxxxx
				Xxxxx X. Xxxxxx, Manager
Date: June 3, 2004		/s/ Xxxxx X. Xxxxxx
		Xxxxx X. Xxxxxx