- Отрасли: 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 ...
A foliated rock formed by regional metamorphism, in which bands or lenticles of granular minerals alternate with bands or lenticles in which minerals having flaky or elongate prismatic habits predominate. Generally less than 50% of the minerals show preferred parallel orientation. Although a gneiss is commonly feldspar- and quartz-rich, the mineral composition is not an essential factor in its definition. Varieties are distinguished by texture (e.g., augen gneiss), characteristic minerals (e.g., hornblende gneiss), or general composition and/or origins (e.g., granite gneiss).
Industry:Mining
A force represented with separate values for the heat liberated by the explosive decomposition and the detonating rate.
Industry:Mining
A force such as the force applied when a haulage rope pulls a set of tubs.
Industry:Mining
A forced circulation heat treatment furnace designed to operate at a maximum temperature of 760 degrees C, which is either gas fired or electrically heated. The gas circulates at the rate of 0.89 m/s.
Industry:Mining
A foreign inclusion in an igneous rock. Compare: autolith; xenocryst.
Industry:Mining
