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
Orthomarble
Mining; General mining
A crystalline limestone that will take a polish; e.g., the Holston orthomarble of Tennessee. Compare: metamarble; metalimestone; ortholimestone.
Dolomite marble
Mining; General mining
A crystalline variety of limestone, containing in excess of 40% of magnesium carbonate as the dolomite constituent.
Calcite marble
Mining; General mining
A crystalline variety of limestone containing not more than 5% of magnesium carbonate.
Paper spar
Mining; General mining
A crystallised variety of calcite found in thin lamellae or paperlike plates.
Bell tap
Mining; General mining
A cylindrical fishing tool having an upward-tapered inside surface provided with hardened threads. When slipped over the upper end of lost, cylindrical, downhole drilling equipment and turned, the ...
Nelson Davis separator
Mining; General mining
A cylindrical dense-medium washer developed in the United States. It uses a magnetite water suspension as medium. The bath resembles a drum in shape, its longitudinal axis being horizontal; within ...
