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
Ore boat
Mining; General mining
A boat constructed esp. for transporting iron ore on the Great Lakes.
Lithodeme
Mining; General mining
A body of intrusive, pervasively deformed, or highly metamorphosed rock, generally nontabular and lacking primary depositional structures, and characterised by lithic homogeneity. It is mappable at ...
Horseback
Mining; General mining
A body of clay, usually roughly tabular in form like an ore vein, that fills a crevice in a coal seam. It is believed to have originated where the pressure was high enough to force 616 clay from the ...
Time-stratigraphic unit
Mining; General mining
A body of rock established to serve as the material reference for all rocks formed during the same span of time. Each of its boundaries is synchronous. Chronostratigraphic units in order of ...
Chronostratic unit
Mining; General mining
A body of rock established to serve as the material reference for all rocks formed during the same span of time. Each of its boundaries is synchronous. Chronostratigraphic units in order of ...
Aquiclude
Mining; General mining
A body of relatively impermeable rock that is capable of absorbing water slowly but does not transmit it rapidly enough to supply a well or spring. Compare: confining bed.
