- 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 ...
Orogeny and accompanying granitic emplacement that affected Precambrian rocks of northern Minnesota and adjacent Ontario about 2.4 billon years ago; it is synonymous with the Kenoran orogeny of the Canadian classification.
Industry:Mining
Orthoclase, albite, or oligoclase that is more or less transparent, with fiery reflections from enclosed flat mineral particles, which are probably hematite or goethite. Sunstone is aventurine oligoclase.
Industry:Mining
Orthorhombic Cu<sub>5</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>.3H<sub>2</sub>O ; perhaps the mineral antlerite.
Industry:Mining
Orthorhombic minerals, synchysite-(Ce) CaCe(CO<sub>3</sub>)<sub>2</sub>F , synchysite-(Nd) CaNd(CO<sub>3</sub>)<sub>2</sub>F , and synchysite-(Y) CaY(CO<sub>3</sub>)<sub>2</sub>F (doverite) of the bastnaesite group; pseudohexagonal. See: doverite
Industry:Mining
Outpouring of lava from a line or system of fissures, so that vast areas have become covered by nearly horizontal sheets of extrusive flows.
Industry:Mining
Overburden in excess of the average overburden-to-ore ratio that must be removed in opencut mining.
Industry:Mining
