Siegfried Otto Weidner

Rio Algom Ltd. is a diversified Canadian mining and metals distribution company, whose mining activities include the production of copper, gold, uranium, molybdenum and coal in North and South America. It also operates a metal distribution business in Canada and the United States. The company is located in Toronto, Canada.

Guerrero Ventures, Inc. engages in the acquisition, exploration, development, and production of mineral properties. Its assets include Bonikro Gold Stream, Woodlawn Silver Stream, Blyvoor Gold Stream, and Blackwater Gold Royalty. The company was founded on February 20, 1961 and is headquartered in Montréal, Canada.

ValOro Resources, Inc. was a Canadian mineral exploration company. It engaged in the business of acquisition, exploration and development of mineral properties in North and South America. The company focused on the Tepal Gold Copper Porphyry project in Mexico. The company was founded by Robert D. Willis on July 5, 1996 and headquartered in Vancouver, Canada.

BHP Group Plc engages in the exploration, development, production, processing and marketing of minerals, and oil and gas. It operates through the following segments: Petroleum, Copper, Iron Ore, and Coal. The Petroleum segment focuses on exploration, development, and production of oil and gas. The Copper segment includes mining of copper, silver, lead, zinc, molybdenum, uranium, and gold. The Iron Ore segment focuses only on mining of iron ore. The Coal segment is the mining of metallurgical coal and thermal energy coal. The company was founded on June 29, 2001 and is headquartered in London, the United Kingdom.

Williams Creek Gold Ltd. engages in the exploration of mineral properties. The company was founded on June 19, 1946 and is headquartered in Vancouver, Canada.