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    Both these processes are used on a commercial scale for separating silver and . by 2000 bce mining and smelting of silver bearing lead ores was under way. .. for telephone relays, circuit breakers, and other electrical switching equipment.

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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.