Mining - Wikipedia
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 commodity 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.Machines and the Coal Miner's Work | eHISTORY,Other pages reviewed the work of a coal miner and coal mining in the 1870s. These pages will be about the coal industry at the turn of the twentieth century. These pages will show the introduction of laborsaving machinery into coal mining. For the course "History 563" the machinery has no intrinsic interest as artifact.Coal Cost Guide - Costmine,Complete, Up-to-Date Mining Cost Information. One characteristic is common to all successful coal mining companies; their decisions are based on the best, most accurate cost information available. To get that information, many of them turn to Costmine’s Mining Cost Service and the Coal Cost Guide.