21 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
Bauxite cement
Mining; General mining
A cement made from bauxite and lime in an electric furnace; it hardens rapidly. Sometimes called ciment fondu.
Pozzolana cement
Mining; General mining
A cement produced by grinding together portland cement clinker and a pozzolana, or by mixing together a hydrated lime and a pozzolana.
Divided cell
Mining; General mining
A cell containing a diaphragm or other means for physically separating the anolyte and catholyte.
Vesicle
Mining; General mining
A cavity of variable shape in a lava, formed by the entrapment of a gas bubble during solidification.
Principal meridian
Mining; General mining
A central meridian on which a rectangular grid is based; specif. one of a pair of coordinate axes (along with the base line) used in the U.S. Public Land Survey system to subdivide public lands in a ...
Roman cement
Mining; General mining
A cement produced by grinding together portland cement clinker and a pozzolana, or by mixing together a hydrated lime and a pozzolana.
Replaceable pilot
Mining; General mining
A central interchangeable pluglike portion of a noncoring bit protruding or leading the outside portion of such bits.
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