- 업종: 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 dam constructed of earth material (such as gravel, broken weathered rock, sand, silt, or soil). It has a core of clay or other impervious material and a rock facing of riprap to protect against wave erosion.
Industry:Mining
A dam made by driving piles and filling the interstices with stones. The surfaces are usually protected with planking.
Industry:Mining
A dark brown to black asphaltic pyrobitumen with conchoidal fracture occurring as veins 1 to 16 ft (0.3 to 4.9 m) wide in the Albert Shale of Albert County, NB, Can. It is partly soluble in turpentine, but practically insoluble in alcohol. It was earlier called albert coal.
Industry:Mining
A dark green or bronze-colored monoclinic pyroxene, which in addition to the prismatic cleavages has others parallel to the vertical pinacoids. Mohs hardness, 4; sp gr, 3.2 to 3.35. Used also as a prefix to many rocks containing the mineral.
Industry:Mining
A dark variety of clay ironstone containing sufficient carbonaceous matter (10% to 20%) to make it self-calcining (without the addition of extra fuel).
Industry:Mining
A dark variety of clay ironstone containing sufficient carbonaceous matter (10% to 20%) to make it self-calcining (without the addition of extra fuel).
Industry:Mining
A dark, dense limestone containing abundant organic matter, believed to have accumulated under stagnant conditions and emitting a fetid odor when freshly broken or vigorously rubbed; e.g., the Bone Spring Limestone of Permian age in west Texas.
Industry:Mining
A dark, dense limestone containing abundant organic matter, believed to have accumulated under stagnant conditions and emitting a fetid odor when freshly broken or vigorously rubbed; e.g., the Bone Spring Limestone of Permian age in west Texas.
Industry:Mining
