- 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 geometrically determining the detonation velocity of an explosive material by using a lead witness plate and detonating cord ignited by the test explosive.
Industry:Mining
A method of geophysical prospecting in which vibrations are set up by firing small explosive charges in the ground or by other artificial sources. Precise measurements of the resulting waves are taken, from which the nature and extent of underlying strata are revealed.
Industry:Mining
A method of geophysical prospecting, that embraces the mapping of variations in the Earth's gravitational field.
Industry:Mining
A method of gold recovery in which cyanidation dissolves the metal from an ore pulp and the aurocyanide is simultaneously absorbed by activated carbon. This last is then retrieved by froth flotation.
Industry:Mining
A method of grinding and mixing material, with or without liquid, in a rotating cylinder or conical mill partially filled with grinding media such as balls or pebbles.
Industry:Mining
A method of growing refractory crystals; similar in many respects to crystallization for aqueous solutions, but the fluxes are salts with relatively high melting temperatures.
Industry:Mining
A method of growing single crystals of refractory oxides, and of other compounds, by pulling from the pure melt; the compound must melt congruently.
Industry:Mining
A method of haulage in which one rope--the main rope--is attached to the front end of a trip of cars and another rope--the tail rope--is attached to the rear end of the trip. It is operated by a hoisting engine and two separate drums.
Industry:Mining
A method of heavy blasting in which a heading is driven into the rock and afterwards filled with explosives in large quantities. This is similar to a borehole on a large scale, except that the heading is usually divided into two parts on the same level at right angles to the first heading. This forms a T, the ends of which are filled with explosives and the intermediate parts of which are filled with inert material like an ordinary borehole. Similar to gopher hole blasting.
Industry:Mining
A method of high-frequency heating in which the object to be heated, which must be nonconducting, is placed in a high-frequency alternating field where it is heated by the continually reversed polarization of the molecules. Applied in the foundry for drying sand cores.
Industry:Mining
