- 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 ...
Orbicular jasper containing spherical inclusions of colorless or nearly colorless quartz.
Industry:Mining
Ordinarily referred to as a dobe shot. A stick or part of a stick of dynamite is laid on the rock to be broken and covered with mud to add to the force of the explosion. A mudcap shot.
Industry:Mining
Ordinary field and topographic surveying in which Earth curvature is disregarded and all measurements are made or reduced parallel to a plane representing the surface of the Earth. The accuracy and precision of results obtained by plane surveying may decrease as the area surveyed increases in size. Compare: geodetic surveying
Industry:Mining
Ordinary lay rope has the wires twisted in a direction opposite to the twist of the strands in the rope. The pitch of wire is from 2-1/2 to 3 times the diameter of the rope, and the pitch of the strands is from 6-1/2 to 9 times the diameter of the rope, the wires being exposed only in short lengths at intervals.
Industry:Mining
Ordinary water, H<sub>2</sub>O , as distinguished from heavy water, D<sub>2</sub>O , D being the symbol for deuterium (heavy hydrogen or hydrogen 2).
Industry:Mining
Ore deposited from ascending hydrothermal solutions of magmatic origin.
Industry:Mining
