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    Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals usually those containing metals such as ore containing gold silver iron copper zinc nickel tin and lead but also involves using the same techniques for excavating ores of gems such as diamonds or rubies. Soft rock mining refers to excavation of softer minerals such as salt coal

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    Dec 21 2015 · In an opencast or strip mining operation the run of mine (ROM) material is normally transported to the primary crusher by haul trucks and in underground mining operations it is conveyed to the primary crusher. Crushing equipment is important to the mining process because it reduces the use of precious excavated resources and eliminates the

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    Jan 09 2017 · What lies below Caves and tunnels under the Quad-Cities. A dump truck unloads material into the crusher during operations at Linwood mine near Buffalo. A mile or more of underground mine

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