Mineral mining

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

Sounding rod

Mining; General mining

A closed pipe, 1 in (2.5 cm) in diameter, with a flush point and a driving tip, used in sounding.

Bipyramid

Mining; General mining

A closed form consisting of orthorhombic, trigonal, tetragonal, or hexagonal positive and negative pyramids.

Dipyramid

Mining; General mining

A closed form consisting of orthorhombic, trigonal, tetragonal, or hexagonal positive and negative pyramids.

Box groove

Mining; General mining

A closed groove between two rolls, formed by a collar on one roll and fitting between collars on another.

Continental basin

Mining; General mining

A closed structural depression of regional extent in the interior of a continent.

A coarse-threaded joint in the head of a double-tube core barrel. If the core barrel becomes lodged in the borehole, the safety joint, inner tube, and core can be removed by backing off at the safety ...

Cellular cofferdam

Mining; General mining

A cofferdam, with a double wall, consisting of steel sheet piling arranged in intercepting rings about 50 ft (15 m) in diameter. The space between the lines of piling is filled with sand.