- 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 ...
In trigonometry, a law stating that in any triangle (either right or oblique) the sides are proportional to the sines of their opposite angles.
Industry:Mining
In trigonometry, a law stating that in any triangle the square of one side equals the sum of the squares of the two other sides minus twice the product of these two other sides multiplied by the cosine of the included angle.
Industry:Mining
In tunnel blasting, holes that parallel the tunnel alignment drilled between the cut and the perimeter holes.
Industry:Mining
In tunnel excavation, a small heading driven in advance of the main tunnel.
Industry:Mining
In tunneling, digging in dirt and rock in the same heading at the same time.
Industry:Mining
In underground blasting, the cut obtained by the use of single cut holes inclined downward.
Industry:Mining
In underground excavation, fall of small stone and debris from roof, warning that a heavy fall may be imminent.
Industry:Mining
In underground mining, ore left adjacent to a longwall face to stop flying ore from being lost when blasting. A secondary use is to confine ventilation.
Industry:Mining
In underground mining, the weight of rock above an excavation that has been transferred to the adjoining walls.
Industry:Mining
