- 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 ...
The last-formed interstitial material between the larger mineral grains in an igneous rock or in a microcrystalline groundmass. Compare: groundmass
Industry:Mining
The lateral distance between the center lines of each strand of a multiple-strand chain, or between the tooth profiles on a sprocket for a multiple-strand roller chain.
Industry:Mining
The law governing a twinning observed in the hexagonal system commonly shown by quartz in which two righthand or two lefthand crystals interpenetrate after one has revolved 180 degrees about the twinning axis.
Industry:Mining
The law, discovered by Sir Isaac Newton, that every particle of matter attracts every other particle of matter, and the force between them is proportional to the product of their masses divided by the square of their distance apart.
Industry:Mining
The layer of the Earth's crust below the zone of weathering in which percolating waters cement unconsolidated deposits by the deposition of dissolved minerals from above.
Industry:Mining
The layer or seam of shale occurring immediately above the Pittsburgh coal seam. Because of its friable nature, this shale or slate is taken down in most mining operations.
Industry:Mining
The lead or stagger that exists between planing blades in the same vertical plane of a plow.
Industry:Mining
The lead rail of an ordinary mine switch is the turnout rail lying between the rails of the main track.
Industry:Mining
The leasable minerals include oil, gas, sodium, potash, phosphate, coal, and all minerals within acquired lands. Acquisition is by application for a Government lease and permits to mine or explore after lease issuance.
Industry:Mining
The leaving of a small thickness of coal at the bottom of the seam in a working place, usually in back water. The coal so left is termed "cropper coal."
Industry:Mining
