- 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 ...
An irregular prospecting drift following or seeking the ore without regard to maintenance of a regular grade or section.
Industry:Mining
An irregular prospecting drift following or seeking the ore without regard to maintenance of a regular grade or section.
Industry:Mining
An irregular, glassy, often tubular or rodlike structure or crust produced by the fusion of loose sand (or rarely, compact rock) by lightning, and found esp. on exposed mountain tops or in dune areas of deserts or lake shores. It may measure 40 cm in length and 5 to 6 cm in diameter. Etymol. Latin fulgur, lightning.
Industry:Mining
An irregular, glassy, often tubular or rodlike structure or crust produced by the fusion of loose sand (or rarely, compact rock) by lightning, and found esp. on exposed mountain tops or in dune areas of deserts or lake shores. It may measure 40 cm in length and 5 to 6 cm in diameter. Etymol. Latin fulgur, lightning.
Industry:Mining
An irregular, terracelike tract between two fault scarps, produced on a hillside by step faulting in which the downthrow is systematically on the same side of two approx. parallel faults. Compare: fault bench
Industry:Mining
An island that is constructed by humans rather than formed by natural means, usually in waters less than 30 m deep. In the mining industry they are commonly used to support the construction of service or ventilation shafts for underground mines extending offshore.
Industry:Mining
An isochemical change in a crystal structure in which chemical bonds are broken and reformed, e.g., tridymite-quartz or diamond-graphite. Compare: dilational transformation; displacive transformation; rotational transformation; phase transformation.
Industry:Mining
An isochemical phase change involving only a shift in angle of chemical bonds, e.g., beta-quartz to alpha-quartz. Compare: phase transformation; displacive transformation; reconstructive transformation; dilational transformation.
Industry:Mining
An isogonic line that connects points of zero magnetic declination. Its position changes according to the secular variation of the Earth's magnetic field.
Industry:Mining
