- 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 method of obtaining sound steel by fluid compression of the ingot in the mold. The molds are divided in the center, a removable packing piece being placed between the halves of the mold. The packing piece is removed when the metal has set, and the mold is placed horizontally in the press, pressure being applied to the ingot at both ends.
Industry:Mining
A method of opencast mining of coal where the dip of the seam is relatively steep. A boxlike excavation is made to the dip, or at an angle to it, and the coal seam is worked to the right and left.
Industry:Mining
A method of ore reserve estimation based on the assumption that a linear relationship exists between grade difference and the distance between all drill holes.
Industry:Mining
A method of packing for road maintenance that consists of gate side packs 3 to 5 yd (2.7 to 4.6 m) wide, next a gap of at least the width of the road, and finally a large pack 5 to 7 yd (4.6 to 6.4 m) wide. The waste packs are made at least 2 yd (1.8 m) wide and not less in width than twice the thickness of the seam. The gaps provided in strip packing are kept clear of supports and allow the roof to break up and flow toward them. This puts the strata in tension over the roads and reduces fracture and crush.
Industry:Mining
A method of paying for the coal in proportion to the amount of lump coal it contains.
Industry:Mining
A method of placing concrete by intruding the mortar component in position; it is then converted to concrete by intruding the mortar component into its voids. One of the chief advantages of the method is that it permits the placing of concrete underwater.
Industry:Mining
A method of preparing aggregates for bituminous surfaces in which aggregates and bitumen are combined in a plant situated at the road or at a relatively long distance from the road. Also known as the premixed method.
Industry:Mining
A method of preparing aggregates for bituminous surfaces in which the aggregates and bitumen are combined on the surface of the road, using the penetration or mixed-in-place method.
Industry:Mining
A method of process operation that introduces tightly controlled variations designed to transfer laboratory-proved improvements into changes leading to better commercial production.
Industry:Mining
A method of producing refractory materials in the desired form by mixing the raw materials in the requisite proportions, heating to fusion in an electric furnace, and then casting.
Industry:Mining
