- 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 ...
An ore deposit that has been reliably established as to its volume, tonnage, and quality by approved sampling, valuing, and testing methods supervised by a suitably qualified person. The proved reserve is the overridingly important asset of a mine, and by its nature is a wasting one from the start of exploitation unless it is increased by further development.
Industry:Mining
An ore deposit that has been reliably established as to its volume, tonnage, and quality by approved sampling, valuing, and testing methods supervised by a suitably qualified person. The proved reserve is the overridingly important asset of a mine, and by its nature is a wasting one from the start of exploitation unless it is increased by further development.
Industry:Mining
An ore deposit that has been subjected to great pressure, high temperature, and alteration by solutions. It may have become warped, twisted, or folded, and the original minerals may have been rearranged and recrystallized.
Industry:Mining
An ore mineral of any metal or metals with which sulfur and arsenic are united chemically.
Industry:Mining
An ore mineral that crystallized as a primary magmatic mineral of igneous rocks.
Industry:Mining
An ore mineral that was deposited during the original period or periods of metallization. The term has also been used to designate the earliest of a sequence of ore minerals, as 2459 contrasted with later minerals of the same sequence, which some writers have called secondary. To avoid confusion, Ransome proposed the terms hypogene and supergene. Hypogene, as the word implies, indicates formation by ascending solutions. All hypogene minerals are necessarily primary, but not all primary ore minerals are hypogene; e.g., sedimentary hematite is of primary deposition even though it formed as a low-temperature precipitate.
Industry:Mining
An ore of sufficiently high grade to be acceptable for shipment to market without preliminary treatment. Compare: second-class ore
Industry:Mining
An ore of sufficiently high grade to be acceptable for shipment to market without preliminary treatment. Compare: second-class ore
Industry:Mining
An ore pillar at the top of an open stope left for wall support and protection from wall sloughing above.
Industry:Mining
