- المجال: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A plutonic rock composed essentially of alkali feldspar and nepheline. It may contain an alkali ferromagnesian mineral, such as an amphibole (riebeckite, arfvedsonite, barkevikite) or a pyroxene (acmite or acmite-augite); the intrusive equivalent of phonolite. Sodalite, cancrinite, hauyne, and nosean, in addition to apatite, sphene, and opaque oxides, are common accessories. Rare minerals are also frequent accessories.
Industry:Mining
A plutonic rock composed essentially of alkali feldspar and nepheline. It may contain an alkali ferromagnesian mineral, such as an amphibole (riebeckite, arfvedsonite, barkevikite) or a pyroxene (acmite or acmite-augite); the intrusive equivalent of phonolite. Sodalite, cancrinite, hauyne, and nosean, in addition to apatite, sphene, and opaque oxides, are common accessories. Rare minerals are also frequent accessories.
Industry:Mining
A plutonic rock composed essentially of alkali feldspar and nepheline. It may contain an alkali ferromagnesian mineral, such as an amphibole (riebeckite, arfvedsonite, barkevikite) or a pyroxene (acmite or acmite-augite); the intrusive equivalent of phonolite. Sodalite, cancrinite, hauyne, and nosean, in addition to apatite, sphene, and opaque oxides, are common accessories. Rare minerals are also frequent accessories.
Industry:Mining
A plutonic rock differing in composition from gabbro by the presence of alkali feldspar.
Industry:Mining
A pneumatic drill that is used widely in mining for exploration and for blasting purposes.
Industry:Mining
A pneumatic stowing machine that consists of a paddle wheel with six compartments working inside an adjustable airtight casing. This wheel is driven at a speed of 15 to 30 rpm by means of an air turbine through gearing. Two sizes of Beien machines are used having capacities of 30 yd<sub>3</sub>and 60 yd<sub>3</sub>(22.9 m<sub>3</sub>and 45.9 m<sub>3</sub>) of stowing material per hour, respectively. The dirt falls from the paddle wheel into the airstream in the pipe underneath the paddle box and passes along 6-in (15.2-cm) diameter pipes to the outlet, where a detachable deflector guides the stream of dirt into the required place in the pack hole.
Industry:Mining
A pneumatic table for dry cleaning coal. It consists of perforated deck plates arranged in a series of lateral steps with a longitudinal inclination. A centrifugal fan provides a constant upward blast of air through the deck. The usual layering takes place, the refuse sinking to the deck plates. The capacity of the table ranges from 6 st/h per foot (17.8 t/h/m) of width for sizes 1-1/2 to 2 in (3.8 to 5.1 cm), down to 2 st/h/ft (5.9 t/h/m) for fines below 1/16 in. They are built in any width up to a maximum of about 8 ft (2.4 m).
Industry:Mining
A pneumatic table of American design, for the drycleaning of coal. A sizing ratio of 2:1 is desirably the maximum range of sizes that the table can separate in one operation.
Industry:Mining
A pneumatic table, of U.S. design, for the drycleaning of coal, an improved form of the S.J. table.
Industry:Mining
