- Industry: 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 ...
Eng. A channel or passage partitioned off from a shaft or left behind the lining, usually running along one corner of the latter. Used for ventilation.
Industry:Mining
Eng. A clause inserted in some mining leases providing for an abatement of royalty or allowance on weight for certain weight of small coal or breakage sent out in every ton of large coal, for example, 120 lb (54.5 kg) in every collier's ton of 2,640 lb (1,200 kg).
Industry:Mining
Eng. A clause that, in granting leases of minerals (coal, ironstone, and clay in particular), provides that lessees may, during every year of the term, make up any deficiency in the quantity of coal, etc., stipulated to be worked, so as to balance the dead or minimum rent.
Industry:Mining
Eng. A deposit of rubbish and waste or unsalable coal that ignites spontaneously.
Industry:Mining
Eng. A donkey engine; a small engine employed in sinking a shallow shaft.
Industry:Mining
Eng. A drill hole in the mine roof with a wooden plug driven into it from which to hang a plumbline.
Industry:Mining
Eng. A form of the longwall system of working coal, in which all the main and branch roadways are made and maintained in the goaves.
Industry:Mining
