
نام کتاب : Gold_Mining_Formation_and_Resource تعداد صفحات : 241 فایل : pdf زبان : انگلیسی رشته : جامعه معدن و علوم زمین مقدمه : Gold, a chemical element with the symbol Au, is a highly sought-after precious metal, having been used as money, in jewelry, in sculpture, and for ornamentation since the beginning of recorded history. The metal occurs as nuggets or grains in rocks, in veins and in alluvial deposits. Gold mining consists of the processes and techniqu ...