- 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 rubber-tired, self-propelled loading, transporting, and dumping machine.
Industry:Mining
A rubble-filled trench system in the slope of a railway cutting, laid out in herringbone fashion and leading surface water into buttress drains arranged along the line of steepest slope.
Industry:Mining
A rudely cylindrical orebody that decreases at the ends like a cigar or a potato.
Industry:Mining
A rule by which the capacity of hydraulic elevators is computed. It is as follows: M = H x N/C, where M = cubic yards of material lifted per hour, H = available head of water in feet, N = water flow in cubic feet per second, C = the efficient working height of the elevator, taken as head H in hundreds of feet multiplied by 15.
Industry:Mining
A rule for estimating the area of an irregular figure after dividing it into an even number of parallel strips of equal width.
Industry:Mining
A rule for estimating the area of an irregular figure by dividing it into parallel strips of equal width, each strip being a trapezium.
Industry:Mining
A rule of thumb for estimating the depth of a magnetic body, which is valid if the body may be regarded as magnetically equivalent to a single pole. The depth of such a pole is equal to the horizontal distance from the point of maximum vertical magnetic intensity to the points where the intensity is one-third of the maximum value.
Industry:Mining
A rule stating that rock breaks from the surface inward toward the explosive rather than from the explosive charge outward.
Industry:Mining
A rule stating that rock breaks from the surface inward toward the explosive rather than from the explosive charge outward.
Industry:Mining
A rule stating that when a pillar has to be left in an inclined seam for the support of a shaft or of a surface structure, a greater width should be left on the rise side of the shaft or structure than on the dip side.
Industry:Mining
