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The conflict mineral: coltan mining in DR Congo and Australia. In recent years the 'obscure mineral' coltan—geological name Columbite Tantalite—has become widely known and politicised for being closely connected with the violence of armed groups in the Ea

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A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is t

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Mining in Europe has a very long history. Examples include the silver mines of Laurium, which helped support the Greek city state of Athens.Although they had over 20,000 slaves working them, their technology was essentially …

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