- 업종: 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 historical method of drilling blastholes in rock by hammer and a hand-held steel or bit. Single-jack drilling was done by one miner. In double-jack drilling, one miner held the steel for one or two strikers with hammers.
Industry:Mining
A hoist with two drums that can be driven separately or together by a clutch.
Industry:Mining
A hoisting device that does its lifting by means of an electromagnet.
Industry:Mining
A hold or grip on a drill rod, casing, or pipe by means of serrated-face steel wedges or slips.
Industry:Mining
A hole at or near the bottom of a furnace or ladle through which molten metal, matte, or slag can be tapped or drawn from a furnace.
Industry:Mining