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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.

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Auger mining is method for recovering coal by boring into a coal seam at the base of strata exposed by excavation. Normally one of the lowest-cost techniques of mining, it is limited to horizontal or slightly pitched seams that have been exposed by geologic erosion.

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Miners dug deep holes, or shafts which would be approximately one meter squared and could be up to 50 meters deep. The miners would put timber along the sides of the shaft to stop it from collapsing and would use a windlass or winch to bring up buckets full of soil.

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Geologists make use of satellites equipped with cameras, radar and other sensors to search for geological features that are likely to contain high concentrations of minerals.

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Minerals in the crust dissolve in rain and running water and are washed into creeks and rivers

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to search for mineral deposits, especially by drilling and excavation.