Underground hard rock refers to various underground 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 refers to excavation of softer minerals such as salt, coal
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the U.S. Bureau of Mines USBM, the Homestake Co., a section that allowed for sequential, lift-by-lift simulation and the University of Utah, Salt Lake City, UT. Table 1 shows of cut-and-fill extraction of the ore reserves in the pillar and
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