- 行业: 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 dry sample of soft rock material, such as clay, soil, sand, etc., obtained by forcing, without rotation, a short, tubular device into the formation being sampled by hydraulic pressure or the piledriver action of a drive hammer.
Industry:Mining
A dry sampler equipped with an Iwan auger shoe or cutterhead. See: post-hole digger.
Industry:Mining
A dryer whose moving element consists of two strands of roller chain with specially designed flights, suspended in such a way as to provide means for keeping the bed in a constantly flowing mass. The material flows in a shallow bed over the ascending flights and at the same time is gradually moved across the dryer from the feed point to the discharge point. The gases are pulled from the furnace and through the flowing bed of 2081 coal. The entire area of the dryer is covered by suction from the exhaust fan.
Industry:Mining
A drying out, as in loss of water from sediments, or evaporation from water bodies in arid regions, producing evaporites.
Industry:Mining
A drying unit that differs from the ordinary round tank in that it houses several horizontal trays that divide it into compartments. Each has its own set of rakes and its 3368 own underflow for settled material and peripheral overflow. Used where space is limited or in subarctic conditions that call for antifreeze housing.
Industry:Mining
A dry-stone wall built along the side of a roadway, or in the waste area, of a coal or metal mine. The wall helps to support the roof and also to retain the packing material and prevent it spreading into the roadway.
Industry:Mining
A dual-scale, direct-reading instrument for measuring the combustible gases percentage in mine air. It gives combustible gases readings over the range from 0.2% to 5% and is graduated 0.1% per division on the scale.
Industry:Mining
A duckbill-shaped coal-cutter pick that is forged by the roller type of machine from dies and is the type largely used today. The machine shaping of the pick ensures uniformity. It gives a constant clearance as the point wears down and is particularly suitable for fused-carbide tipping.
Industry:Mining
A dull white hydrous borate of sodium, Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>.5H<sub>2</sub>O . Rhombohedral. An alteration film on borax. Locally, octahedral borax (same as tincalconite). From the Mohave Desert, CA.
Industry:Mining
A dull, dark green rock, uniformly fine-grained with conchoidal fracture, containing grains of greenalite in a matrix of chert, carbonate minerals, and ferruginous amphiboles.
Industry:Mining
