- 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 ...
Substance originally described as a variety of oil shale but later proved to be similar to torbanite.
Industry:Mining
Substance used in flotation processes to control the hydrogen-ion concentration.
Industry:Mining
Substance used to combine with the residual oxygen in an electric bulb or tube. Its use is called gettering.
Industry:Mining
Substance, solution, or gas susceptible to chemical change, or used in influencing such change.
Industry:Mining
Substances, such as wood meal and wheat flour, that are forms of low explosive when mixed with metallic nitrates and tend to reduce the blasting power of the explosives, making them suitable for coal blasting.
Industry:Mining
Successful meeting of two approaching tunnel heads, or of winze and raise.
Industry:Mining
Successive beds or strata are conformable when they lie one upon another in unbroken and parallel order and no disturbance or denudation took place at the locality while they were being deposited. If one set of beds rests upon the eroded or the upturned edges of another, showing a change of conditions or a break between the formations of the two sets of rocks, they are unconformable. Compare: unconformable
Industry:Mining
Sudden outburst of coal and rock that occurs when stresses in a coal pillar, left for support in underground workings, cause the pillar to rupture without warning, sending coal and rock flying with explosive force.
Industry:Mining
Sudden, violent expulsion of coal from one or more pillars, accompanied by loud reports and earth tremors. Bumps occur in coal mines where a strong, thick, massive sandstone roof rests directly on the coal with no cushioning layer of shale between. The breaking of this strong roof as the seam is mined causes violent bumps and the crushing and bursting of pillars left for support. There are two distinctive types of bumps: (1) pressure bumps, which appear to be due to the unit loading of a pillar being too great for its bearing strength, and where the coal roof and floor are strong, the pillar is ruptured suddenly and with violence; and (2) shock bumps, which are thought to be due to the breaking of thick, massive, rigid strata somewhere above the coalbed, which causes a great hammerlike blow to be given to the immediate roof, which it transmits as a shock wave to the coal pillar or pillars.
Industry:Mining
Suggested by Johannsen as an alternative to graphic texture, since the intergrown quartz and feldspar resemble runic characters.
Industry:Mining
