20 Terms
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Mineral mining
The extraction of valuable minerals or other geological materials from the earth for economic interests.
Industry: Mining
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Mineral mining
crystal tuff
Mining; General mining
An indurated deposit of volcanic ash dominantly composed of intratelluric crystals and crystal fragments. Compare: tuff; crystal-vitric tuff; lithic tuff; vitric tuff.
lithic tuff
Mining; General mining
An indurated deposit of volcanic ash in which the fragments are composed of previously formed rocks; e.g., accidental particles of sedimentary rock, accessory pieces of earlier lavas in the same ...
pisolitic tuff
Mining; General mining
An indurated pyroclastic deposit composed chiefly of accretionary lapilli or pisolites.
siltstone
Mining; General mining
An indurated silt having the texture and composition of shale but lacking its fine lamination or fissility; a massive mudstone in which the silt predominates over clay; a nonfissile silt shale. It ...
siltite claystone
Mining; General mining
An indurated silt having the texture and composition of shale but lacking its fine lamination or fissility; a massive mudstone in which the silt predominates over clay; a nonfissile silt shale. It ...
calcareous crust
Mining; General mining
An indurated soil horizon cemented with calcium carbonate; caliche.
silica sand
Mining; General mining
An industrial term for a sand or an easily disaggregated sandstone that has a very high percentage of silica (quartz). It is a source of silicon and a raw material of glass and other industrial ...
