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By 2000 bc the process of purifying goldsilver alloys with salt to remove the silver was developed.The mining of alluvial deposits and, later, lode or vein deposits required crushing prior to gold extraction, and this consumed immense amounts of manpower.By ad 100, up to 40,000 slaves were employed in gold mining in spain.
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Adopt sealed dust removal design, less dust, low noise, low carbon and environmental protection
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Provide door-to-door installation services, guide the training of operating personnel, and ensure the effective operation of the machine
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