Mining - Wikipedia
Mining is the extraction of valuable minerals or other geological materials from the earth, usually from an orebody, lode, vein, seam, reef or placer deposit.These deposits form a mineralized package that is of economic interest to the miner. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay.gold mineral processing machines for sale in austria vienna,gold mineral processing machines for sale in austria vienna;,and 6 years alibaba gold supplier. . One sales representative serves you from inquiry to products shipped out. Chat Online.,gold mining china factory offer; flotation mineral separator for gold;Mining in Austria - Wikipedia,Mining in Austria is an industry on the decline.. After a period of postwar expansion, mineral production has stagnated in recent decades, and metals mining continues to decline, because of high operating costs, increased foreign competition, low ore grades, and environmental problems.