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    Bauxite is generally extracted by open cast mining, being almost always found near the surface, with processes that vary slightly depending on the location. Before mining can commence the land needs to be cleared of timber and vegetation.

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    Processing of Bauxite Ores To Obtain Aluminum Bauxite, the primary aluminum ore, uses the Bayer Process to extract alumina from the ore. The processing begins with crushing to 1-2 inch particles and wet screening, to remove some silica fines, which are generally present with bauxite.

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    The Bayer Process was invented and patented in 1887 by Austrian scientist Karl Josef Bayer. Two to three tonnes of bauxite are required to produce one tonne of alumina. 90% of the global alumina supply of around 90 million tonnes is used in aluminium production.

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    Lowongan Tambang 2014 PT Adaro Indonesia operates under a Coal Cooperation Agreement with the Government of Indonesia which gives it the right to mine coal within its Agreement Area in the Tanjung district of Kalimantan Selatan Province until the year 2022 with Rights to extend by mutual agreement are available. There are three deposits within the Agreement Area which contain total coal

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    Apr 27, 2012· LOWONGAN KERJA 2012 Jumat, 27 April 2012. PT Atlas Resources, Tbk; 7 positions; 1 of 2 ads Posting date: April 27, 2012 Expiry date: May 11, 2012 MINE OPERATIONAL SUPERVISOR • 8 10 years experience as a Production Section Head/Manager in open pit coal mining area • Expatriate with suitable competency is welcomed

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    5. Senior Supervisor Mining Operation Training ( Job No. 798722) • Minimum graduated from Senior High School with 3 5 years experiences as Leading Hand or Supervisor Mining and 10 years experience as heavy equipment operator in mining industry. • Able to operate all excavators and shovel types at the maximum of the equipment”s capability.

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