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Mineral resource estimation is used to determine and define the ore tonnage and grade of a geological deposit, from the developed block model.There are different estimation methods used for different scenarios dependent upon the ore boundaries, geological deposit geometry, grade variability and the amount of time and money available.
It was at one time one of the world's ten largest gold mines. [2] The mine is in Obuasi Municipal District, 60 kilometres (37 mi) southwest of the regional capital Kumasi. [3] The obuasi gold mine began in 1897 which was originally known as the Obuasi mine, then later it was renamed AngloGold Ashanti Ghana Limited in 2004.
In 2009, the company's gold output dropped to 4.6 million ounces. [9] As of early 2008, the company had hedged 11.3 million ounces of gold, under previous CEO Bobby Godsell. [10] In January 2009, AngloGold Ashanti sold its 33% stake in the Boddington Gold Mine in Australia to Newmont Mining for US$1.0 billion. [11]
Glencore plc is a Anglo-Swiss multinational commodity trading and mining company with headquarters in Baar, Switzerland.Glencore's oil and gas headquarters are in London, England as well as its primary listing being on the London Stock Exchange, and it is one of the largest components of the FTSE 100 by market capitalization.
Barrick Gold Corporation is a mining company that produces gold and copper with 16 operating sites in 13 countries. [3] It is headquartered in Toronto, Ontario, Canada. [4] It has mining operations in Argentina, Canada, Chile, Côte d'Ivoire, Democratic Republic of the Congo, Dominican Republic, Mali, Papua New Guinea, Saudi Arabia, Tanzania, the United States and Zambia. [5]
The Ashio mine's Excavation Department was closed in 1973, after centuries of mining and the introduction of foreign copper ore into the Japanese market. [2]: 19 By this time, the total length of its tunnels and shaft had reached 1234 kilometers. Smelting business continued at the mine using imported ore until 1989.
Unit Rig was founded in 1935 by Hugh S. Chancey and two partners, Jerry R. Underwood and William C. Guier, who formed a partnership to build a rotary drill rig for oil field work that was more mobile than existing designs. The group based the company in Tulsa, Oklahoma. By 1947, the partnership between the men was beginning to break down when ...
The company was established on February 26, 1980 [3] as the "Semirara Coal Corporation" (SCC). [4] The company entered an agreement with the Department of Energy for an exclusive right to develop, explore, and mine coal resources on Semirara Island in the town of Caluya, Antique. [3] The company discovered coal mining sites in Semirara in Unong ...