August 2009

Tulsa, OK – BlueStone Natural Resources Announces the Addition of Three Banks to its Credit Group

BlueStone Natural Resources, LLC (“BlueStone”) recently added three banks to its existing credit facility. Comerica Bank, Compass Bank and Wells Fargo recently entered the $150 Million facility that is led by Bank of America.

BlueStone was formed in 2006, utilizing funds from the management team and Natural Gas Partners. Since formation, BlueStone has consummated 60 transactions creating a property set largely focused in South Texas. BlueStone currently operates 165 wells, predominately in the prolific Lobo Trend of Webb and Zapata counties, and has an acreage position consisting of more than 100,000 acres situated in South Texas and East Texas.

More than 50,000 acres are located in the emerging Eagle Ford shale play in southern La Salle and McMullen counties. BlueStone participated in its first Eagle Ford well earlier this year, which has been drilled and is awaiting completion. A second Eagle Ford well is currently drilling.

An additional 30,000 acres are located in East Texas, on the border of Walker and Madison counties. Historically, this acreage has been productive from the Glen Rose and James Lime formations, utilizing extremely long reach horizontal drilling.

BlueStone plans to use the increased credit facility to finance growth through additional acquisitions and drilling in its core South Texas and East Texas holdings. John Redmond, President of BlueStone adds, “The addition of Comerica, Compass and Wells Fargo builds additional strength in our banking group. This capacity will allow BlueStone to remain aggressive in the acquisition market over the next year. Historically, we have grown through acquisition and we plan to continue our efforts to find opportunities that increase BlueStone’s holdings in its core areas.”

Founded in 1988, Natural Gas Partners (NGP) is a $7.2 billion family of investment funds organized to make direct equity investments in private energy enterprises. In addition, two co-investment funds were created with $350 million available to invest in direct oil and gas property interests alongside NGP’s portfolio companies. NGP is part of the investment platform of NGP Energy Capital Management, the premier investment franchise in the energy industry with $9.5 billion in cumulative capital under management.

July 2007

TULSA, Oklahoma - BlueStone Natural Resources Announces Acquisitions

BlueStone Natural Resources has acquired Columbus Energy for an undisclosed amount. Columbus will continue to operate as a subsidiary of BlueStone.

Columbus, which has assets concentrated in South Texas and the Rocky Mountains, operates more than 140 wells in these areas producing more than 17.8 MMCFED.

In a separate transaction, BlueStone purchased additional interests in certain South Texas properties operated by Columbus from a subsidiary of Samson.

The funding for the transactions was provided, in part, by a $100MM credit facility with Bank of America, NA.

BlueStone was formed in February 2006 utilizing funds from the management team and Natural Gas Partners. Natural Gas Partners is an affiliate of NGP Energy Capital Management, a private equity firm based in Irving, Texas, that invests in all sectors of the energy industry. BlueStone is based in Tulsa, Oklahoma, with field offices in Laredo, Texas and Sidney, Montana.

Please direct any questions regarding this transaction to bluestone@bluestone-nr.com.

February 2006

Tulsa, OK - BlueStone Natural Resources formed.

BlueStone Natural Resources was formed in February, 2006 utilizing funds from the Management Team and Natural Gas Partners. Some members of the BlueStone Management Team previously partnered with Natural Gas Partners to form AXIO Natural Resources in 2003. AXIO Natural Resources was sold to Chesapeake earlier this year.

The company is headquartered in Tulsa, Oklahoma. BlueStone plans to actively acquire assets in South Texas, East Texas, the Texas panhandle and Western Oklahoma. For additional information, contact John Redmond, President, at (918) 392-9202 or by email at bluestone@bluestone-nr.com.