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

gum copal

Mining; General mining

An inclusive term for a wide variety of hard, brittle, semitransparent, yellowish to red fossil resins from various tropical trees (e.g., Copiafera and Agathis), being nearly insoluble in the ...

An inclusive term for all volcanic subsidence structures regardless of shape or size, depth of erosion, or connection with the surface. The term thus includes cauldron subsidences, in the classical ...

heaving shale

Mining; General mining

An incompetent or hydrating shale that runs, falls, swells, or squeezes into a borehole.

Colorado ruby

Mining; General mining

An incorrect name for the fiery-red garnet (pyrope) crystals obtained from Colorado.

caballing

Mining; General mining

An increase in density occurring when the contents of two pipes carrying water with different temperature and salinity characteristics, but having the same density, are mixed; the resulting fluid ...

dilatancy

Mining; General mining

An increase in the bulk volume of a granular mass during deformation, caused by a change from close-packed structure to open-packed structure, accompanied by an increase in the pore volume. The ...

monotron

Mining; General mining

An indentation hardness testing machine by which measurements are obtained by the pressure required to indent a specimen with a diamond 5/8 mm in diameter, the depth of indentation remaining ...