- 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 broad term encompassing the intrusion and extrusion of magma and its derivative. Adj. pyrogenic.
Industry:Mining
A broad, gently sloping rock-floored erosion surface or plain of low relief, typically developed by running water in an arid or semiarid region at the base of an abrupt and receding mountain front or plateau escarpment; underlain by bedrock that may be bare, but is more often partly mantled with a thin discontinuous veneer of alluvium derived from the upland masses and in transit across the surface.
Industry:Mining
A brown earth that is darker than ocher and sienna, consisting of iron oxide and oxyhydroxide with manganese oxides, clay, and lime. Highly valued as a permanent pigment, it may be used in its greenish brown natural state (raw umber) or in the dark or reddish brown calcined state (burnt umber). Compare: ocher; sienna.
Industry:Mining
A brown earthy substance found in peat and lignite beds and used as a pigment; originally found near Cassel, Germany. Cologne brown or Cologne earth is a similar substance originally found near Cologne, Germany.
Industry:Mining
A brown or reddish-brown sandstone with grains generally coated with iron oxide; specif. a dark, reddish-brown, ferruginous quartz sandstone of Triassic age.
Industry:Mining
A brown to deep-red variety of natural ferric oxide containing an appreciable portion of clay (or sand).
Industry:Mining
A brown to deep-red variety of natural ferric oxide containing an appreciable portion of clay (or sand).
Industry:Mining
A brown to garnet-red resinous material forming lenticular masses in the coal of Carusthia.
Industry:Mining
A brown to red deep-sea deposit, which usually contains manganese nodules or a film of manganese. It is the finest divided clay suspension that is derived from the land and transported by ocean currents, accumulating far from land and at the greatest depths. It has a high proportion of volcanic material due to lesser dilution of this material owing to slowness of accumulation of the clay portion. The color is believed to be caused by oxidation.
Industry:Mining
