- Branża: Mining
- Number of terms: 33118
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- 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 ...
A construction of timbering made by piling logs or beams horizontally one above another, and spiking or chaining them together, each layer being at right angles to those above and below it.
Industry:Mining
A container for carrying detonators in mines. It is so constructed that, when closed, a detonator or the leads of a detonator cannot come into contact with either the metal of the case or any metal outside the case.
Industry:Mining
A container in which diamond screens are inserted and in which the material (diamond particles) that passes through a sieve or screen collects and is retained.
Industry:Mining
A continental method of shaft sinking through sand that is water bearing. The shaft is formed by boring in stages, increasing in size from the pilot hole of about 4 ft (1.2 m) in diameter to the final excavation size. Once the shaft is bored, mud flush circulation continues while the lining is lowered. The lining consists of two steel cylinders, one within the other, and the annular space is filled with concrete. The cylinders are lowered into the shaft, and 10-ft (3-m) lengths are added and welded in position at the shaft top.
Industry:Mining
A continuous analysis of the drilling mud and well cuttings during rotary drilling for entrained oil or gas. Visual observation, ultraviolet fluoroscopy, partition gas chromatograph, and hydrogen-flame ionization analyzer may be used. A drilling-time log is kept concurrently.
Industry:Mining
A continuous beam or slab, both supports of which are continuous with adjacent spans.
Industry:Mining
