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2021year6month25day Surface mining methods most commonly employed for the extraction of metals are known as “open-pit” and “open-cut.” Placer mining (including dredging) is
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الصين -تشنغ تشو -المنطقة الوطنية للتنمية الصناعية للتكنولوجيا المتطورة، جادة العلوم رقم 169.