- Branża: 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 cylinder of inert material that enshrouds a detonator, but that does not interfere with the detonation of the explosive charge.
Industry:Mining
A cylinder, operated by compressed air, that is used to assist the main engine of a compressed-air shaker conveyor, esp. where the conveyor cannot develop a sufficient amount of forward acceleration because of grades. The auxiliary cylinder is attached to the conveyor by a driving chain and to a prop by a fixing chain.
Industry:Mining
A cylindrical amygdule whose longer axis is at right angles to the bedding.
Industry:Mining
A cylindrical container made of steel or some other substance, which contains 25 lb (11.4 kg) of blasting powder or gunpowder. Any small cask or barrel having a capacity of 5 to 10 gal (18.9 to 37.9 L).
Industry:Mining
A cylindrical dense-medium washer developed in the United States. It uses a magnetite water suspension as medium. The bath resembles a drum in shape, its longitudinal axis being horizontal; within the stationary outer casing there is a rotor divided into compartments. Raw coal is fed near the top of the separator, and separation takes place as the rotor revolves. The machine produces clean coal and shale; the magnetite is recovered. It can handle coal up to 10 in (254 mm) in size, the lower limit being about 1/4 in (6.4 mm). Magnetite consumption runs at about 1/2 lb/st (0.25 kg/t) of feed.
Industry:Mining
A cylindrical drill-round cut whose spiral hole pattern gives the widest opening and permits opposite holes to be ignited successfully. This gives the best cleaning of the opening and safety in the advance is increased, since one section of the double spiral can give breakage irrespective of the other.
Industry:Mining
A cylindrical fishing tool having an upward-tapered inside surface provided with hardened threads. When slipped over the upper end of lost, cylindrical, downhole drilling equipment and turned, the threaded inside surface of the bell tap cuts into and grips the outside surface of the lost equipment.
Industry:Mining
A cylindrical fishing tool having an upward-tapered inside surface provided with hardened threads. When slipped over the upper end of lost, cylindrical, downhole drilling equipment and turned, the threaded inside surface of the bell tap cuts into and grips the outside surface of the lost equipment.
Industry:Mining
