- 行业: Mining
- Number of terms: 33118
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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 thin alteration film that forms on mineral surfaces, esp. on copper minerals, with color and luster different from that on fresh fractures.
Industry:Mining
A thin bed of unconsolidated dirt; a parting between the top of coal seam and the roof.
Industry:Mining
A thin dark shiny film or coating, composed of iron oxide accompanied by traces of manganese oxide and silica, formed on the surfaces of pebbles, boulders, and other rock fragments in desert regions after long exposure, as well as on ledges and other rock outcrops. It is believed to be caused by exudation of mineralized solutions from within and deposition by evaporation on the surface.
Industry:Mining
A thin pillar of coal, adjacent to the gob, left for protection while driving a lift through the main pillar.
Industry:Mining
A thin plate of gold spread upon a layer of base metal by soldering the metals in the bar and then rolling the whole out into plate, forming a thinner plate of gold than that of the ware known as gold-filled.
Industry:Mining
A thin plate of gold spread upon a layer of base metal by soldering the metals in the bar and then rolling the whole out into plate, forming a thinner plate of gold than that of the ware known as gold-filled.
Industry:Mining
A thin scale, leaf, lamina, or layer; e.g., one of the units of a polysynthetically twinned mineral, such as plagioclase. Plural, lamellae.
Industry:Mining
