- 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 hoisting in shallow lead-zinc mines in areas of the United States. Instead of the conventional engine house, operation is controlled at the top of the shaft. The onsetter below hooks the can on, then signals by a lamp attached to the wrist of the hoister sitting above. The can is hoisted, swinging free. At the surface a tail rope is snapped to the underside, a deflection plate is swung into place, and the can is lowered. It capsizes and discharges its load to the surge bin. The empty can is then again hoisted, freed of its tail rope, and wound down the shaft, where it is replaced by a full can.
Industry:Mining
A method of holding mine timber sets in place. Blocks of wood are set on the caps directly over the post supports and have a grain of block parallel with the top of the cap; wedges are driven tightly between the blocks and the roof.
Industry:Mining
A method of imparting longitudinal movement to the drill rods on a diamond or other rotary-type drill by a hydraulic mechanism instead of mechanically by gearing.
Industry:Mining
A method of isotope separation based on the fact that atoms or molecules of different masses will diffuse through a porous barrier at different rates. The method is used to enrich uranium with the uranium-235 isotope.
Industry:Mining
A method of isotope separation in which heavy atoms are separated from light atoms by centrifugal force.
Industry:Mining
A method of lashing on to the rope in which the chain, after lapping two to five times around the rope, depending on the load and the inclination, is brought forward across the laps and threaded through the hook at the front. This method keeps the last lap tight and prevents the laps from spreading.
Industry:Mining
A method of lighting in which the well glass surrounding the bulb is flushed out with compressed air through a special valve before a self-contained generator commences to run; afterwards the exhaust from the turbine is passed through the lamp fitting with a small back pressure of 1-1/2 to 2 psi (10.3 to 13.8 kPa), preventing ingress of methane. The equipment can be used underground where the use of electricity is prohibited and for both roadway and face lighting.
Industry:Mining
A method of loading blast holes in which the explosive charges, called decks or deck charges, in the same hole are separated by stemming, air cushion, or a plug.
Industry:Mining
A method of logging boreholes by observing the natural radioactivity of the rocks through which the hole passes. It was developed for logging holes that cannot be logged electrically because they are cased.
Industry:Mining
A method of manufacturing pig iron in which the ore is mixed with a proportionate amount of coal sufficient to smelt it; after adding a binder the mixture is briquetted by means of a roller press into ovoids, which are subjected to low temperature carbonization between 550 degrees C and 600 degrees C, followed by smelting in a low shaft furnace.
Industry:Mining
