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smelting is a form of extractive metallurgy its main use is to produce a base metal from its ore this includes production of silver iron copper and other base

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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

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lab 2 physical separation techniques introduction when two or more substances that do not react chemically are blended together the result is a mixture in which

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the basic processes of gold recovery introduction man has held a fascination with recovering and acquiring gold almost since the beginning of time

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minerals an international peer-reviewed open access journal

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sulfur or sulphur see spelling and etymology is a chemical element with symbol s and atomic number 16 it is abundant multivalent and nonmetallic

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how is gold made? answer 1 gold is made in the interior of massive stars when these stars end their lives they often blow up and produce supernova

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