- 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 ...
Usually has a built-in gasoline engine as prime mover, flushing being provided by the exhaust gases or by compressed air produced in the machine. Total weight varies between 50 lb and 120 lb (22.7 kg and 54.4 kg). Motor hammer drills are used for oddjob operations, on forest roads, in prospecting, etc., where it is not worthwhile to lay air supply lines on account of transport difficulties or insufficient volume of work.
Industry:Mining
Usually hollow ware, such as, saggers, pyrometer tubes, crucibles, etc.; also refractory brick and shapes.
Industry:Mining
Usually refers to cyanide solution in circulation in a mill treating gold or silver ores. The stock or solution is of two main types: barren, from which all possible value has been extracted, and pregs or pregnant, which is charged with gold or silver and awaits their removal.
Industry:Mining
Usually refers to Forsterite brick. Strictly, most bricks are silicate bricks of one kind or other.
Industry:Mining
Usually some cryptocrystalline variety of quartz stained green. Also may be chalcedony of natural green color.
Industry:Mining
Valuation formula used to ascertain present value (Vp) of a mining share.
Industry:Mining
Value calculated from a number of samples, each of which has been assigned an importance in accord with its position and general trustworthiness. In this connection a sample which was cross-checked by others would be more reliable than one which was isolated, particularly if the latter showed abnormal values or was for any other reason suspect. The cross-checked sample is sometimes called a weighted sample in mineral valuation of a deposit.
Industry:Mining
Value of ore or product shipped plus value of the ore, waste, and tailings dumped.
Industry:Mining
