Mineral mining

Mineral mining

The extraction of valuable minerals or other geological materials from the earth for economic interests.

Industry: Mining

Contributors in Mineral mining

Mineral mining

A cage containing two or more compartments or platforms to hold the mine cars supplies or workers. Every effort is made to keep the number of decks as low as possible for a given output in order to ...

Safety rope winch

Mining; General mining

A cable-winding device anchored at the upper grade of an inclined face and having its cable attached to the head of the coal cutter or cutter loader to assist overcoming frictional resistance of the ...

Sunday stone

Mining; General mining

A calcareous deposit formed inside pipes carrying waste water from collieries. It is composed of alternating dark and light bands corresponding to the day and night shifts and a broader light band ...

Dudgeonite

Mining; General mining

A calcian variety of annabergite, (Ni,Ca) 3 (AsO 4 ) 2 .8H 2 O, in which about one-third of the nickel is replaced by calcium; Pibble Mine, Scotland.

Speedy moisture tester

Mining; General mining

A calcium carbide method for the quick determination of moisture. A pressure gauge is calibrated to give direct values of moisture content percent of soil samples.

Drop-bottom cage

Mining; General mining

A cage so designed that the middle section of the floor drops a few inches when the cage is lifted from the keps. The mine car is thus kept stationary and secure.