Extractive Metallurgy of Copper


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Trends in Practice and Costs of Concentrating Copper Ores


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During the past 20 years the milling of copper ores as practiced in the larger concentrators has changed to such an extent that comparatively few of the machines in use at the beginning of this period remain in service today.







Bulletin


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Grade of Ore


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Information Circular


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Mineral Technology and Output Per Man Studies


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