Constellation Energy Partners LLC was founded in 2005 and is headquartered in Houston, Texas. Constellation Energy Partners LLC engages in the acquisition, development, and production of oil and natural gas properties, as well as related midstream assets in the United States. Constellation Energy Partners LLC has interests in the Black Warrior Basin in Alabama, the Cherokee Basin in Kansas and Oklahoma, and in the Woodford Shale in the Arkoma Basin in Oklahoma. As of December 31, 2008, Constellation Energy Partners LLC had approximately 232.4 Bcfe of estimated proved reserves; and owned approximately 2,763 net producing wells. Constellation Energy Partners LLC was formerly known as Constellation Energy Resources LLC and changed its name to Constellation Energy Partners LLC in July 2006.

Continental Resources, Inc. was founded in 1967 and is based in Enid, Oklahoma.Continental Resources, Inc. engages in the exploration, exploitation, and production of oil and natural gas properties primarily in the Rocky Mountain, Mid-Continent, and Gulf Coast regions of the United States. Continental Resources, Inc. primarily sells its oil and natural gas production to end users, as well as to midstream marketing companies or oil refining companies at the lease. As of December 31, 2008, Continental Resources, Inc. estimated proved reserves were 159.3 million barrels of oil equivalent (MMBoe), with estimated proved developed reserves of 106.0 MMBoe. Continental Resources owned 1,114,445 net undeveloped and 399,825 net developed acres, as well as had interests in 2,192 wells and operated 1,657 of these wells.

Corridor Resources Inc. is a junior resource company engaged in the exploration for petroleum and natural gas onshore in New Brunswick, Prince Edward Island and Quebec and offshore in the Gulf of St. Lawrence and the development and production of natural gas in New Brunswick. Primarily an exploration company, it also produces, processes, and transports natural gas from wells at McCully field near Sussex, New Brunswick, to a mill run by Potash Corporation of Saskatchewan, its development partner in the project. Corridor Resources is seeking other partners for more development of the McCully field (and has proven reserves of 9.5 billion cu. ft. of natural gas equivalent in that asset).

Exploration company Crescent Point Energy (formerly Crescent Point Energy Trust) has light and medium oil and natural gas assets in eight core properties in western Canada (Alberta and Saskatchewan). Crescent Point Energy Corp. has net proved plus probable reserves of 175.7 million barrels of oil equivalent. Crescent Point Energy Trust was formed through the reorganization of two junior oil and gas companies, Crescent Point Energy Ltd. and Tappit Resources Ltd. in 2003. More than 80% of Crescent Point Energy Corp. production is in southern Saskatchewan, where Crescent Point is the largest oil producer. In 2009 the Trust acquired Bakken explorer Wild River Resources Ltd. and converted to a corporation to improve shareholder value.

Crew Energy Inc. is a growth-oriented oil and natural gas producer. Crew's activities are concentrated in central Alberta and northeast British Columbia and focus on the development and expansion of its core natural gas and light oil producing areas and exploration of its large, undeveloped land base. Crew’s experienced management team is committed to the pursuit of sustainable per share growth through a balanced mix of financially responsible exploration and development, complemented by strategic acquisitions. An exploration and production company, Crew Energy's assets are located on five properties covering more than 600,000 acres of developed and undeveloped land in Alberta and British Columbia. The company's core natural gas production operations have about 122,000 million cu. ft. of proven and probable reserves.

The Crusader Energy Group was, formerly known as Westside Energy, specializes in horizontal drilling techniques and explores and develops oil and gas properties in the US. Crusader Energy Group LLC concentrates its efforts on the prolific Barnett Shale, the Anadarko Basin, and the Bakken Shale formation in the Williston Basin. Long a dormant company, Crusader Energy Group LLC was reactivated in 2004 as Westside Energy with the intention of developing oil and gas properties as well as looking for acquisitions. In 2008, that company combined with Crusader Energy Group and took on that name. In early 2010 Anadarko Basin explorer Jones Energy acquired Crusader Energy.

Curlew Lake Resources explores for, develops, and produces oil and natural gas in Western Canada and the US. Curlew Lake Resources Inc. is also involved in precious metals exploration. The group has interests in the Turner Valley and Metis oil and natural gas projects in Alberta and in the Fosterton field in Saskatchewan. In the US Curlew Lake Resources Inc. is engaged in developing oil and gas assets in California and Nevada. Curlew Lake Resources Inc. mineral exploration operations focus on developing gold mining prospects in the Typhoon/Clear Creek District of the Yukon Territory, southeast of Dawson City.

Cygam Energy Inc. is a publicly traded exploration company listed on the TSX Venture Exchange in Canada. Cygam Energy Inc. has producing oil and gas properties in Canada and extensive international exploration concessions. Cygam Energy Inc., formerly Sheer Energy, is an oil and gas exploration and production company seeking development opportunities in Western Canada and internationally. In a reverse takeover in 2005, Sheer Energy acquired Italian oil and gas exploration companies Rigo Oil and Vega Oil and changed its corporate name to Cygam Energy. The bulk of the company's revenues are generated from gas production. Cygam Energy Inc. is developing exploration assets in Italy and Tunisia. Cygam Energy Inc. has five exploratory concessions in Italy and four exploratory concessions in Tunisia, encompassing four million gross acres.

Dakota Gasification Company (Dakota Gas), owns and operates the Great Plains Synfuels Plant (Synfuels Plant). The Synfuels Plant is the only commercial-scale coal gasification plant in the United States that manufactures natural gas. Dakota Gasification Company is also the cleanest energy plant operating in the state of North Dakota, according to a comparison of emissions data available from the North Dakota Department of Health. The Great Plains Synfuels Plant harnesses the abundant coal resources underlying the North Dakota prairie. The gasification process transforms more than 6 million tons of coal into more than 54 billion cu. ft. of natural gas annually, which is then used to supply the Eastern US. In addition to natural gas, the company's Synfuels plant produces carbon dioxide, fertilizers, solvents, phenol, and other chemicals.

Dana Petroleum is an oil and natural gas exploration and production company with operations in the North Sea, as well as Australia, Egypt, Kenya, Morocco, Mauritania, and Senegal. Dana Petroleum plc has expanded its production activities in the North Sea, where Dana Petroleum plc has 16 producing fields. The company's growth strategy is to balance low-risk production from the UK North Sea with more aggressive high-risk international exploration and production (primarily in Egypt). At the end of 2007 Dana reported proved and probable reserves of 165.8 million barrels of oil equivalent. That year Dana Petroleum plc acquired Devon Energy's oil and gas business in Egypt for $375 million. In 2008 Dana was operating four producing fields in Egypt.

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