- 업종: 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 ...
A borehole in which fragments of the material making up the walls of the hole slough so much that the borehole cannot be kept open without the use of casing or cementation.
Industry:Mining
A borehole in which the charge of explosive has been fired with no other effect than to blast off a small amount of material at the mouth of the borehole; also called a bootleg or John Odges.
Industry:Mining
A borehole in which the circulating medium carrying the cuttings does not return to the surface.
Industry:Mining
A borehole in which the target could not be reached because of caving, squeezing, loose ground, or inability to recover lost tools or junk.
Industry:Mining
A borehole into which a cement slurry or grout has been forced by high-pressure pumps and allowed to harden.
Industry:Mining
A borehole measurement of gamma rays originating in a gamma-ray source in the instrument and scattering back from the rock formation to a detector shielded from the source. The amount of scattering is proportional to electron density and, therefore, proportional to mass concentration so that the measurement, after certain corrections, yields a density log of the formation penetrated.
Industry:Mining
A borehole penetrating only the uppermost part of an orebody with the intention of delineating its surface configuration. Also, a shallow hole drilled to scout for an indication of ore or to explore an area in a preliminary manner.
Industry:Mining
A borehole plugged by debris lodged at some point above the bottom of a hole. The hole may be bridged deliberately by introducing foreign material into the hole or accidentally by rock fragments sloughing off the sidewalls of the borehole.
Industry:Mining
A borehole put down through an upper impervious bed into a lower pervious one, from which a supply of water is obtained.
Industry:Mining
