- 行业: 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 rotary or percussive-type drill equipped with core-cutting tools or bits, the cutting points of which are not inset with diamonds.
Industry:Mining
A rotary- or percussive-type drill used to drill underground blastholes to depths exceeding 3 m. Compare: long hole
Industry:Mining
A rotary-type drill machine using equipment and tools designed to recover rock samples in the form of cylindrical cores from rocks penetrated by boreholes.
Industry:Mining
A rotary-type drill on which a rotary bucket is fastened to the kelly bar. The bucket is equipped with a hinged bottom, which has straight-edged cutting blades or teeth. When rotated by the kelly bar, the bucket loads from the bottom; when filled, it is withdrawn from the hole and dumped by unlatching the bottom. Holes 30 to 250 cm in diameter can 2707 be drilled with this machine in soft, boulder-free ground.
Industry:Mining
A rotary-type drill on which a rotary bucket is fastened to the kelly bar. The bucket is equipped with a hinged bottom, which has straight-edged cutting blades or teeth. When rotated by the kelly bar, the bucket loads from the bottom; when filled, it is withdrawn from the hole and dumped by unlatching the bottom. Holes 30 to 250 cm in diameter can 2707 be drilled with this machine in soft, boulder-free ground.
Industry:Mining
A rotary-type drill on which a rotary bucket is fastened to the kelly bar. The bucket is equipped with a hinged bottom, which has straight-edged cutting blades or teeth. When rotated by the kelly bar, the bucket loads from the bottom; when filled, it is withdrawn from the hole and dumped by unlatching the bottom. Holes 30 to 250 cm in diameter can 2707 be drilled with this machine in soft, boulder-free ground.
Industry:Mining
A rotary-type drill on which a rotary bucket is fastened to the kelly bar. The bucket is equipped with a hinged bottom, which has straight-edged cutting blades or teeth. When rotated by the kelly bar, the bucket loads from the bottom; when filled, it is withdrawn from the hole and dumped by unlatching the bottom. Holes 30 to 250 cm in diameter can 2707 be drilled with this machine in soft, boulder-free ground.
Industry:Mining
A rotatable coupling on a Thompson retrievable wedge-setting assembly that may be set and locked in a predetermined position in reference to the gravity-control member. This places the deflection wedge so as to direct the branch borehole in the desired course.
Industry:Mining
A rotating cylinder with a machined inner or outer surface upon which a brake band or brakeshoe presses.
Industry:Mining
