Underground hard-rock mining
UNDERGROUND MINING TECHNIQUES USED TO EXCAVATE HARD MINERALS
Glory hole (mining); Hard rock mining; Sublevel open stoping; Block Caving; Block caving; Muck (mining); Deepest mine; Hard-rock mining; Underground mining (hard rock)
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. It also involves the same techniques used to excavate ores of gems, such as diamonds and rubies.