- 行业: 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 borehole drill bit having cutters that may be expanded to cut a larger size hole than the size of the bit in its unexpanded state; also, a device equipped with cutters that may be expanded inside casing or pipe to sever, or cut slits or holes in, the casing or pipe. Compare: paddy.
Industry:Mining
A borehole drill, either rotary or churn-drill type, driven by a combustion-type engine using a combustible liquid, such as gasoline, or a combustible gas, such as bottle gas, as the source of the motivating energy.
Industry:Mining
A borehole drilled at an angle from the vertical not exceeding 45 degrees. The drilling technique is called angle drilling.
Industry:Mining
A borehole drilled at an angle through the rock strata generally for the purpose of combustible gases drainage.
Industry:Mining
A borehole drilled for the express purpose of using it as a means by which grout may be injected into the rock surrounding the borehole. Compare: consolidation hole.
Industry:Mining
A borehole drilled specif. to obtain a detailed record of the character and composition of the rock formation penetrated and not for the purpose of locating a mineral deposit.
Industry:Mining
A borehole drilled to determine the character of bedrock and the character and depth of overburden overlying such bedrock.
Industry:Mining
A borehole drilled to determine the character of bedrock and the character and depth of overburden overlying such bedrock.
Industry:Mining
