- المجال: Mining
- Number of terms: 33118
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- 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 massive, amorphous, dark-brown metamorphic hydrocarbon ranging from soft and elastic to hard and brittle; melts in a candle flame without decrepitation; conchoidal fracture.
Industry:Mining
A massive, amorphous, dark-brown metamorphic hydrocarbon ranging from soft and elastic to hard and brittle; melts in a candle flame without decrepitation; conchoidal fracture.
Industry:Mining
A massive, blue, violet-blue, or blue-black, opaque variety of quartz colored by intergrown crystals of dumortierite.
Industry:Mining
A massive, coarsely crystalline to finely granular, sedimentary rock of the mineral gypsum with bedding commonly disturbed by expansion during hydration of parent anhydrite.
Industry:Mining
A massive, coarsely crystalline to finely granular, sedimentary rock of the mineral gypsum with bedding commonly disturbed by expansion during hydration of parent anhydrite.
Industry:Mining
A massive, deep indigo-blue copper-lead sulfide, Cu<sub>2</sub>S.PbS . It contains 53.63% copper and 28.25% lead. Tarnishes quickly.
Industry:Mining
A massive, earthy mineral (apatite) consisting of an impure, altered phosphate.
Industry:Mining
A massive, honey-yellow or greenish variety of serpentine with a waxy or resinous luster.
Industry:Mining
A mass-movement landform and process characterized by downslope translation of soil and weathered rock over a discrete basal shear surface (landslide) within well-defined lateral boundaries. Little or no rotation of the slide mass occurs during displacement. Earthflows grade into mudflows with increasing fluidity. Also spelled: earth flow.
Industry:Mining
A mat made of porous material, usually canvas, and used to subdivide and distribute air in certain pneumatic-type flotation machines.
Industry:Mining