- 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 slaty or schistose argillaceous rock whose spotted appearance is the result of incipient growth of porphyroblasts in response to contact metamorphism of low to medium intensity. Compare: desmosite; spilosite; adinole.
Industry:Mining
A slaty or schistose argillaceous rock whose spotted appearance is the result of incipient growth of porphyroblasts in response to contact metamorphism of low to medium intensity. Compare: desmosite; spilosite; adinole.
Industry:Mining
A sleeve joint packed to allow longitudinal expansion. A slip expansion joint.
Industry:Mining
A slice of rock or mineral that has been highly polished for examination by reflectedlight or electron microbeam techniques, a procedure mostly applied to opaque minerals.
Industry:Mining
A slide of homogeneous earth or clay in which the slip surface of failure closely follows the arc of a circle.
Industry:Mining
A slide produced by shear failure, usually along a plane of weakness, as bedding or cleavage.
Industry:Mining
A slide wire or cable extending from a work platform in a drill tripod or derrick at an oblique angle downward to an anchor on the ground, which the derrick or tripod worker could grasp and use when sliding to safety in an emergency.
Industry:Mining
A sliding piece in percussive boring designed to reduce the vibration and jarring effects when the downward movement of the chisel is suddenly arrested by striking the bottom of the borehole. The lower portion (which is attached to the chisel) is free to slide up and down in a slot provided in the upper part of the joint. When the chisel strikes the bottom of the hole, the slot allows the rods to continue the downward movement without being jarred by the blow of the chisel.
Industry:Mining
A slight refinement of grab sampling in which the material to be sampled is spread out flat and channeled in one direction with a shovel, and the material for the sample is taken at regular intervals along the channel. The procedure is repeated with several other channels in different directions until a sample of the proper size has been secured.
Industry:Mining
A slight refinement of grab sampling in which the material to be sampled is spread out flat and channeled in one direction with a shovel, and the material for the sample is taken at regular intervals along the channel. The procedure is repeated with several other channels in different directions until a sample of the proper size has been secured.
Industry:Mining
