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

Keweenawan

Mining; General mining

A provincial series of the early Proterozoic in Michigan and Wisconsin.

Pahrump

Mining; General mining

A provincial series of the Precambrian in California.

A pseudochromatic optical effect resulting in flashes of colored light from certain minerals, such as fire opal and labradorite, as they are turned in white light. Periodic spacings of phases with ...

cyanide process

Mining; General mining

A process for the extraction of gold from finely crushed ores, concentrates, and tailings by means of cyanide of potassium or sodium used in dilute solutions. The gold is dissolved by the solution ...

cyanide mill

Mining; General mining

Soisson Rodange process

Mining; General mining

A process for the manufacture of high-quality killed basic Bessemer steel in which the steel, after dephosphorization, is poured into another ladle containing the solid components of a basic ...

rustless process

Mining; General mining

A process for the manufacture of stainless steels in an electric furnace that uses a chrome ore as a source of chromium with or without the addition of silicoferrochromium, conjointly with stainless ...