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Of or pertaining to the process or business of extracting materials, such as ore or minerals, from the earth's crust.

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Mining > Mining tools

Mohs scale

Mining; Mining tools

A scale used to measure and compare the hardness of minerals based on how easy it is to scratch them.

placer deposit

Mining; Mining tools

A placer deposit or placer is an accumulation of valuable minerals formed by gravity separation during sedimentary processes. Placer mining is an important source of gold, and ...

alluvial placers

Mining; Mining tools

Alluvial placers are those formed in river or stream sediments. Typical locations for alluvial gold placer deposits are on the inside bends of rivers and creeks; in natural ...


Mining; Mining tools

A jig is a type of tool used to control the location and/or motion of another tool. A jig's primary purpose is to provide repeatability, accuracy, and interchangeability in the ...

drill jig

Mining; Mining tools

A drill jig is a type of jig that expedites repetitive hole center location on multiple interchangeable parts by acting as a template to guide the twist drill or other boring ...

jig borer

Mining; Mining tools

The jig borer is a type of machine tool invented at the end of World War I to make possible the quick-yet-very-precise location of hole centers. It was invented independently in ...


Mining; Mining tools

Extraction of valuable minerals or other geological materials from the earth from an orebody, lode, vein, seam, or reef, which forms the mineralized package of economic interest ...