کد فایل 1247393
قیمت: 35٬000 تومان
فرآیند لیچینگ هیدرومتالورژی طلا Gold and silver almost always occur together in the native state They are recovered from the following sources: Alluvial or placer deposits. Veins associated with quartz and various sulfides. Refining residues of nonferrous metals: Gold is usually a by-product o