4 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
magnetite
Mining; General mining
An igneous rock consisting essentially of magnetite and having an iron content of 65% to 70% or more. Apatite may accompany the magnetite.
cumulate
Mining; General mining
An igneous rock formed by the accumulation of crystals that settle out from a magma by the action of gravity; examples include layered igneous deposits such as the Bushveld complex in South Africa ...
accumulative rock
Mining; General mining
An igneous rock formed by the accumulation of crystals that settle out from a magma by the action of gravity; examples include layered igneous deposits such as the Bushveld complex in South Africa ...
phanerite
Mining; General mining
An igneous rock having the grains of its essential minerals large enough to be seen macroscopically.
porphyry
Mining; General mining
An igneous rock of any composition that contains conspicuous phenocrysts in a finegrained groundmass; a porphyritic igneous rock. The term (from a Greek word for a purple dye) was first applied to a ...
platy flow structure
Mining; General mining
An igneous rock structure of tabular sheets suggesting stratification. It is formed by contraction during cooling; the structure is parallel to the surface of cooling and is commonly accentuated by ...
helium
Mining; General mining
An inert, monatomic, colorless, odorless element, the lightest of the rare gases. Except for hydrogen, helium is the most abundant element found in the universe. The bulk of the world's supply is ...
