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Sierra Minerals Holdings is the only company mining bauxite in the country, and the second largest employer in the mining industry. It runs the Sieromco Bauxite Mine as well as holding the mining lease to 321.7 km2. In 2009 production of bauxite fell by 22.17 percent to 742,820 tons. This was due to Sierra Minerals ceasing production from June ...
In 1964 and 1966, Sentry entered into mining lease agreements with the tribes for 64,848 acres. The first lease was made in 1964 for 24,858 acres of land held exclusively by the Navajo Tribe, designated Navajo Coal Lease No. 14-20-0603-8580, or N-8580 for short.
Modular Mining is a privately held company that develops, manufactures, markets, and services mining equipment management systems, headquartered in Tucson, Arizona, U.S.A. Modular's DISPATCH Fleet Management System is available in eight languages, and has been deployed at more than 250 active mine sites; among these are nine of the ten highest-producing surface mines in the world.
History. In 1923 the orebody containing lead, zinc and silver was discovered by the miner John Campbell Miles. Prominent mining engineer William Henry Corbould was invited to the field by Douglas MacGilvray, who held options over several tenements, and immediately noted similarities between the Mount Isa orebodies and those of Broken Hill, New South Wales.
After a JV was formed on 1 June 2002 Koidu Limited acquired the remainder of the 25-year mining lease agreement originally signed in 1995. After the second successful post-war democratic election in 2007, the Government of Sierra Leone undertook to review all mining agreements in the country. The Mining Review Process commenced in July 2008 and ...
Net smelter return. Net Smelter Return (NSR) is the net revenue that the owner of a mining property receives from the sale of the mine's metal/non metal products less transportation and refining costs. As a royalty it refers to the fraction of net smelter return that a mine operator is obligated to pay the owner of the royalty agreement.
Automated mining. Automated mining involves the removal of human labor from the mining process. [1] The mining industry is in the transition towards automation. It can still require a large amount of human capital, particularly in the developing world where labor costs are low so there is less incentive for increasing efficiency.
Deep sea mining is the extraction of minerals from the ocean floor at depths of 200 metres (660 ft) to 6,500 metres (21,300 ft). Deep-sea mining uses hydraulic pumps or bucket systems that carry deposits to the surface for processing. The environmental impact of deep sea mining is controversial.
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