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Rand Leases Mine, Johannesburg, Johannesburg District . Age: Siderian (2300 - 2500 Ma) Lithology: Mafic-intermediate undivided volcanic rocks Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767.

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Underground mining (hard rock) - Wikipedia. Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals[1] 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.

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