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

Tuscarora quartzite

Mining; General mining

An important source of raw material for silica refractories. A typical analysis is 97.8% SiO 2 , 0.9% Al 2 O 3 , 0.7% Fe 2 O 3 , and 0.4% alkalies.

blowout shot

Mining; General mining

An improperly placed or overcharged shot of black blasting powder in coal (where used), frequently results in a mine explosion.

An improved centrifugal-type mine fan. The vanes, of aerofoil section, are curved backward from the direction of rotation. This fan is popular in British coal mines, and total efficiencies of about ...

rapid excavation

Mining; General mining

An improved cycle and system of operation to achieve rapid advance and continuous operation in low-drillability rock.

Blair process

Mining; General mining

An improved form of the Chenot process for making sponge iron by heating crushed iron oxide and coal in retorts.

Simbal breathing apparatus

Mining; General mining

An improved liquid oxygen breathing apparatus, weighing 33 lb (15 kg) and approved for use in British mines. Air is fed to the wearer at a temperature of 50 degrees F (10 degrees C) rising to 70 ...