- Branża: 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 circular plate conveyor to effect a preliminary grading of coals and removal of stone by hand. A screened-out fraction of the run-of-mine coal is delivered to the table by chute from a conveyor. As the stream of coal revolves on the table, the various grades of coal and the dirt are raked into positions where they are diverted by plows into chutes. The operators are positioned on the inner and outer edges of the table and the coal is not handled but only raked.
Industry:Mining
A circular rock-lined pit in which broken ore is pulverized by stones attached to horizontal poles fastened in a central pillar and dragged around the pit. Also spelled arrastra.
Industry:Mining
A circular saw for cutting stone with points of the teeth made of pieces of diamonds.
Industry:Mining
A circular structure lacking evidence of shock metamorphism or of meteorite impact and therefore presumed to be of igneous origin, but lacking exposed igneous rocks or obvious volcanic features; a rock structure produced by concealed volcanic activity. Preferred term: cryptoexplosion structure.
Industry:Mining
A circular, revolving, inclined iron pan in which concentrates are ground with mercury and water by an iron ball.
Industry:Mining
A claim containing the original discovery of exploitable mineral deposits in a given locale, which may lead to claims being made on adjoining areas.
Industry:Mining
A claim corner whose position is evidenced by a monument or its accessories as described in the field note record, or whose location can be identified by the aid of acceptable testimony.
Industry:Mining
A claim made to prevent the patenting of part of the ground within the area in question; e.g., an adverse claim is made by a senior locator to exclude the part of his or her claim that is overlapped by the claim of a junior locator, when the junior locator is applying for patent.
Industry:Mining
A claim that includes the bed of a creek. Under the statute of Oregon, a tract of land 100 yd (91.5 m) square, one side of which abuts on a creek or rather extends to the middle of the stream.
Industry:Mining
