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Colombia Energy Resources, Inc. engages in the exploration and development of coal mines in the Republic of Columbia. The company holds 10 coal mining concession contracts to exploit coal deposits in 10,455 hectares in the Boyacà and Santander districts of the Republic of Colombia. It also has an option to purchase a coal mining concession contract with 1,550 hectares in the Boyacà district. The company was formerly known as Colombia Clean Power & Fuels, Inc. and changed its name to Colombia Energy Resources, Inc. in November 2011. Colombia Energy Resources, Inc. was founded in 1996 and is based in San Francisco, California.

Tango Mining Limited operates as a Canadian diversified junior mining company. It holds three thermal coal, metallurgical and processing plant, and engineering contracts in the Ogies and Highveld coalfields, Mpumalanga province and Kliprivier coalfield, KwaZulu-Natal province in South Africa. The company also holds interests in the Oena Diamond Mine, an alluvial diamond property, which is located in Northern Cape Province in South Africa; the Middlepits Project, which includes two prospecting licenses, such as PL101 and PL58 and is located in the Kgalagadi District, the Republic of Botswana; the Mano River Project that consists of one 104.3 square kilometer diamond mineral exploration license located in the western part of Republic of Liberia; and the Moquita Project is located in the Province of Lunda Norte, the Republic of Angola. In addition, it acquires, explores for, and develops mineral properties. The company was formerly known as Tango Gold Mines Incorporated and changed its name to Tango Mining Limited in November 2014. Tango Mining Limited was incorporated in 2007 and is based in Vancouver, Canada.