- 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 ...
A motor-driven blower (fan) to provide secondary ventilation into spaces inadequately ventilated by the main ventilating system; the air is directed to such spaces through a duct.
Industry:Mining
A motor-driven disk, propeller, or wheel for blowing (or exhausting) air to provide ventilation of a mine.
Industry:Mining
A motor-driven disk, propeller, or wheel for blowing (or exhausting) air to provide ventilation of a mine.
Industry:Mining
A mottled green variety of pumpellyite used as a semiprecious stone; forms grains, small nodules, or a radial, fibrous structure in geodes in mafic igneous rocks; resembles prehnite; occurs in the Lake Superior region (esp. on Isle Royale).
Industry:Mining
A mottled variety of jasper found in New South Wales, Australia; much sought by miners, it commonly occurs with diamonds.
Industry:Mining
A mound, ridge, or other distinct accumulation of unsorted, unstratified glacial drift, predominantly till, deposited chiefly by direct action of glacier ice, in a variety of topographic landforms that are independent of control by the surface on which the drift lies.
Industry:Mining
A moundlike or circumscribed mass of rock built up by sedentary organisms such as corals, mollusks, and algae. Compare: biostrome
Industry:Mining
A mountain range that extends parallel to the continental margins in mid-ocean in both the North and South Atlantic Oceans. It rises 6,000 ft above the ocean floor and surfaces as the Azores, Ascension Island, Saint Helena, and Tristan da Cunha islands.
Industry:Mining
A mountain range that owes its elevation and structural form mainly to faulting and tilting of strata and that is flanked by alluvium-filled basins or valleys. Etymol: from the Great Basin, a region in the Southwestern United States characterized by fault-block mountains.
Industry:Mining
