Donald B. Ratcliff

American Institute of Mining, Metallurgical & Petroleum Engineers operates as an engineering society. The company was founded in 1871 and is headquartered in Englewood, CO.

Mineral Economics & Management Society engages in the minerals, metals and mining industries. The company is headquartered in Golden, CO.

The Group's principal activity is that of a mining development and exploration company. It currently focuses its resources primarily on the development of San Cristobal Project in Bolivia. San Cristobal is an open-pit silver-zinc-lead deposit, containing approximately 450 million ounces of silver, eight billion pounds of zinc and three billion pounds of lead in proven and probable reserves. San Cristobal is expected to produce approximately 17 million ounces of silver, 225,000 tonnes of zinc and 82,000 tonnes of lead per year on a payable basis in the first five years of operation. The project currently has sufficient reserves to operate for approximately 16 years with a current design capacity of 40,000 tonnes of ore per day. The Group also holds an extensive portfolio of highly prospective exploration properties located primarily in the traditional precious metals-producing regions of Argentina, Peru, Mexico and Bolivia.

Part of Dakota Mining Corp., Tenneco Minerals Co. is a company that owns and operates a mining operation. The company is based in St. George, UT. Tenneco Minerals was acquired by USMX, Inc., a SUB of Dakota Mining Corp. from Tenneco, Inc. /Old/ on January 12, 1993.