Underground Mining (hard Rock)
Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, mainly 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. In contrast soft rock mining refers to excavation of softer minerals such as salt, coal, or tar sands.
Read more about Underground Mining (hard Rock): Development Mining Vs. Production Mining, Ventilation, Ground Support, Ore Removal, Deepest Mines
Famous quotes containing the words underground and/or mining:
“Political correctness is driving machismo underground and recalling effeminacy from exile.”
—Mason Cooley (b. 1927)
“It’s a mining town in lotus land.”
—F. Scott Fitzgerald (1896–1940)