- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
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 ...
(South Africa) A ridge, range of hills, or highland on either side of a river valley.
Industry:Mining
(South Africa) Decomposed, soft country rock found in connection with auriferous conglomerates.
Industry:Mining
(South Africa) Development to provide an ore reserve in advance of mining operations.
Industry:Mining
(South Africa) Grade below which the mining of ore is considered to become unpayable. There has been much discussion about mining below the pay limit for technical reasons, as a result of taxation, or to conserve natural resources.
Industry:Mining
(South Africa) Mining a grade of ore above the average grade of the ore reserves. This practice has the effect of leaving the lower grade ore in the reserves. The opposite is undermining.
Industry:Mining
(South Africa) One (short) ton (0.9 t) of rock in place equals about 12 ft<sub>3</sub>(0.34 m<sub>3</sub>). Horizontally, therefore, the weight of an ore reserve covering a claim over a stoping width of 3 ft (0.91 m) is 64,000 ft<sub>2</sub>X 3 ft / 12 ft<sub>3</sub>/st = 16,000 st (14,500 t) at 100% payability. In case the vein dips downward, the resulting amount must be divided by the cosine of the angle of dip.
Industry:Mining
(South Africa) Part of the Jeppestown Series forming the footwall of the Main Reef on the Central and East Rand.
Industry:Mining
