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    methods and brief explanations of the techniques of room-and-pillar mining, sublevel stoping, cut-and-fill, longwall mining, sublevel caving, and block caving. The second section describes underground mining equipment, with particular focus on excavation machinery such as boomheaders, coal cutters, continuous miners and shearers. 1. Underground ...

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    Mining is the extraction of valuable minerals or other geological materials from the earth, usually from an ore body, 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.

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    The mining techniques adopted to extract gemstones invariably reflect the nature of the deposit: primary deposits (in hard rocks, worked underground or in open pits) and secondary deposits (found in sedimentary, soft-rock, placers). The mineralogy of a gem dictates the type of geological environment in which it can be found.

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  • When Gem Mining Is a Dirty Business - Condé Nast Traveler

    Sep 09, 2011· Even novice gem shoppers know to consider a stone''s color, cut, and clarity before making a purchase. What they may not take into account is that gem mining.

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  • Mining and metallurgy in medieval Europe - Wikipedia

    Throughout the medieval period these technical innovations, and the traditional techniques, coexisted. Their application depended on the time period, and geographical region. Water power in medieval mining and metallurgy was introduced well before the 11th century, .

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