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    The term "mining" is used in the broad sense to include ore extraction, quarrying, . such as heat treatments, take place in both stages: the beneficiation and the . as gold and silver, can be transformed into bullion before leaving the mine site.

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    Lead ores were smelted to obtain an impure lead silver alloy, which was then fire refined by cupellation. The best known of the ancient mines were located at.

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    What you need is what we can do! In the future, Xinhai will continue to rely on three big supporting "technology, talents, management", adhere to the international development strategy, and concentrate on providing customers with modern, efficient, energy-saving mine overall construction and operational solution, to create international leading enterprises in mining industry.