2012 1 1ensp;0183;ensp;Chalcopyrite ores are usually processed by means of hydrometallurgical or pyrometallurgical processes, but due to environmental aspects and the possibility of increased exploitation of mixed and lower grade ores and relatively small isolated deposits, there has been a worldwide upsurge of interest in the hydrometallurgical processes of this ore as compared to pyrometallurgy.
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2018 10 23ensp;0183;ensp;The crown had a monopoly on mercury and set its price. During the Bourbon reforms of the eighteenth century, the crown increased mercury production at Almad233;n and lowered the price to miners by half resulting in a huge increase in Mexico's silver production. As production costs dropped, mining became less risky so that there was a new surge of mine openings and improvements.
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2018 10 26ensp;0183;ensp;Insight, analysis and ideas about gold investments from the best experts in the gold industry
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