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the process of metallurgy is one of the oldest branches of science it can be traced back to bc in the 17th century only 12 elements were known and this number

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martin 39 s new words 3 1 13 thursday april 10th assay - noun the testing of a metal or ore to determine its ingredients and quality a procedure for measuring

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from the start of copper mining in the michigan copper district ore has been divided into two classes the rock with higher copper content was smelter ore also

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the following outline is provided as an overview of and topical guide to mining mining extraction of valuable minerals or other geological materials from the

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copper processing the extraction of copper from its ores and the preparation of copper metal or chemical compounds for use in various products

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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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