- 行业: 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 ...
The ratio of lead-206 to uranium-238 and/or lead-207 to uranium-235, formed by the radioactive decay of uranium within a mineral. The ratios are frequently used as part of the uranium-thorium-lead age method.
Industry:Mining
The ratio of pithead output (tons) to length of face (yard) or tons per yard of face. The management objective is to keep this figure as high as practicable.
Industry:Mining
The ratio of pithead output in tons (P) to length of main haulage roads in yards (L) or tons per yard of main haulage roads; i.e., P/L.
Industry:Mining
The ratio of radiant energy emitted by a body to that emitted by a perfect black body. A perfect black body has an emissivity of 1; a perfect reflector an emissivity of 0.
Industry:Mining
The ratio of radiant energy reflected by a body to that falling upon it.
Industry:Mining
The ratio of solid phases crystallizing from the eutectic liquid at the eutectic temperature. It is such as to yield a gross composition for the crystal mixture that is identical with that of the liquid. It is most frequently stated in terms of weight percent.
Industry:Mining
The ratio of the air-indicated horsepower to the indicated horsepower in a power cylinder, in the case of compression driven by steam or internal-combustion engines, and to the brake horsepower delivered to the shaft in the case of a power-driven machine.
Industry:Mining
The ratio of the amount of carbon monoxide produced over the oxygen absorbed varies with the temperature of oxidation of coal and also with the time of coal exposure to oxidation, thereby allowing this ratio to be used as an index of the rate of oxidation in a mine.
Industry:Mining
The ratio of the apparent specific gravities of the mineral against the suspension (not against the liquid) raised to a power between one-half and unity.
Industry:Mining
