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Mining tools

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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 was the main technique ...

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 hollows; at the break of ...


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 manufacturing of ...

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 device into the precise ...

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 the United States and ...


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 to the miner.

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