- 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 general collective term for extrusive igneous and pyroclastic material and rocks.
Industry:Mining
A general failure of the hanging wall. In the gold mines of South Africa and the Michigan copper mines, block movements have been experienced.
Industry:Mining
A general investigation of superficial deposits. The sampling procedure may include augers, boreholes, and trial pits, and tests are made to cover soil identification. This type of survey aims at establishing soil profiles and locating areas requiring special investigation.
Industry:Mining
A general law upon which all geologic chronology is based: In any sequence of sedimentary strata (or of extrusive igneous rocks) that have not been overturned, the youngest stratum is at the top and the oldest at the base; i.e., each bed is younger than the bed beneath, but older than the bed above it. The law was first clearly stated by Steno (1669).
Industry:Mining
A general name for any of a large group of bottom-dwelling, sessile, marine invertebrate organisms (polyps) that belong to the class Anthozoa (phylum Coelenterata), are common in warm intertropical modern seas and abundant in the fossil record in all periods later than the Cambrian, produce external skeletons of calcium carbonate, and exist as solitary individuals or grow in colonies.
Industry:Mining
A general name for igneous rocks of fine grain size, normally occurring as lava flows, and thus in direct contrast with plutonites.
Industry:Mining
A general name for marbles of cream, yellow, pink, and red color, found in northern Africa. The quarries were worked by the ancient Romans.
Industry:Mining
