Coal Mining Methods Underground Mining Longwall & Room and Pillar Mining Longwall mining and room-and-pillar mining are the two basic methods of mining coal
Mining is the extraction of valuable minerals or other geological materials from the earth usually from an orebody, lode, vein, seam, reef or placer deposits.
History of the old west including information on overland trails, stage routes, railroads, mining & geology, native americans and other historical figures
Placer Mining. The stereotypical grizzled gold-rush prospector panning for gold was searching for "placer gold", or gold deposited in a waterway.
Mining techniques have dramatically transformed over many years, with technological advances improving efficiency and the safety and health of our people, while ...