- 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 surveyor's chain, containing 100 links of 7.92 in (20.12 cm) each.
Industry:Mining
A surveyor's compass with a vernier, used for measuring angles without the use of the magnetic needle by means of a compensating adjustment made for magnetic variation.
Industry:Mining
A surveyor's compass with diametral projecting arms each carrying a vertical slit sight.
Industry:Mining
A surveyor's instrument used for setting out land or buildings to any angle and in preliminary survey work generally and made up of a horizontal graduated semicircle that surrounds a compass and is attached to a base with fixed vertical sights at each end and of a movable arm with vertical sights at each end that pivots on the center of the base.
Industry:Mining
A suspended multiple deck screen with increased slopes in the second and third deck. It is used principally for coal and other large feed materials and combines scalping and sizing operations. The oversize lump material is removed on the top deck, egg or range size on the second, and nut size on the bottom deck.
Industry:Mining
A suspension of very fine particles in air. A coal that breaks down easily when heated gives off its volatile matter very easily and perhaps more quickly than the available draft can supply the air for combustion, with the result that dark smoke containing much unburnt or partly burnt material is given off--a loss of fuel energy.
Industry:Mining
A suspension, generally aqueous, used in rotary drilling and pumped down through the drill pipe to seal off porous zones and to counterbalance the pressure of oil and gas; consists of various substances in a finely divided state among which bentonite and barite are most common. Oil may be used as a base of water. Compare: circulation fluid; mud-laden fluid.
Industry:Mining
