- 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 double-tube core barrel in X-group sizes. The distinguishing feature of the Pickard barrel is that when blocked, the inner barrel slides upward into the head, closing the water ports and stopping the flow of the circulating liquid; no additional drilling can be done without irreparably damaging the bit until the barrel is pulled and the blocked inner tube is cleared.
Industry:Mining
A double-tube core barrel with the inner tube split lengthwise.
Industry:Mining
A double-tube soil-sampling device designed to be rotated by hand to obtain soil samples from relatively shallow depths. The inner tube is a swivel type, and its cutting end leads the bottom of the spiral on the outside of the outer tube.
Industry:Mining
A doubtful sulfide containing bismuth, gold, and silver; lead-gray in color. It may be a mixture of (Bi,Au,Ag<sub>2</sub>)S , or possibly of a gold-silver alloy, and bismuthinite, Bi<sub>2</sub>S<sub>3</sub>. From Nacozari, Sonora, Mex.
Industry:Mining
A doughnut-shaped accelerator in which electrons are accelerated by a changing magnetic field.
Industry:Mining
A downward current of air or other gas (as in a mine shaft, kiln, or carburetor).
Industry:Mining
A downward current of air or other gas (as in a mine shaft, kiln, or carburetor).
Industry:Mining
A downward projection of country rock into an igneous intrusion. Compare: cupola.
Industry:Mining
A drag or trailer fixed at the back of a haulage train (or set) as a safety device when going uphill.
Industry:Mining
