- Industry: 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 breaking oversize stones after primary blasting at a quarry.
Industry:Mining
A method of breaking oversize stones left after quarry blasting. The balls weigh from 30 hundredweight (1,360 kg) to 2 st (1.8 t) (many use old cones from gyratory breakers) and are dropped from a crane on to the oversize stone. The drop height varies from about 20 to 33 ft (6.1 to 10.1 m). The method is economical and avoids secondary blasting.
Industry:Mining
A method of burning the coal in place to produce a combustible gas that can be burned to generate power or processed into chemicals and fuels. Air and/or steam is blown underground to support the controlled combustion in the coal seam. The resultant gaseous mixture is a low-heating-value fuel gas.
Industry:Mining
A method of burning the coal in place to produce a combustible gas that can be burned to generate power or processed into chemicals and fuels. Air and/or steam is blown underground to support the controlled combustion in the coal seam. The resultant gaseous mixture is a low-heating-value fuel gas.
Industry:Mining
A method of calculating bending moments, in redundant frames and continuous beams, using successive approximations.
Industry:Mining
A method of carburizing open hearth steel that consists of treating the molten steel with carbon in the form of charcoal, graphite, or coke.
Industry:Mining
A method of carrying out a triaxial test on a sand sample by maintaining a partial vacuum in the rubber bag containing the sample.
Industry:Mining
A method of carrying out mining works in which the owners, Board, or Authority, carry out the scheme by employing labor and purchasing the necessary equipment. The method is in contrast to work entrusted to outside contractors for performance at a fixed sum.
Industry:Mining
A method of casting molten metal, in which the molds are spun and centrifugal force helps to fill them.
Industry:Mining
A method of caving by which all the ground around a central raise might be worked in a series of slices arranged like the spokes of a wheel.
Industry:Mining
