- 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 small instrument that is capable of estimating methane in the range of 0% to 2% .
Industry:Mining
A small lightweight device, used in pairs that straddle and are locked to each of the rails to retrack railroad cars and locomotives. Of Y-shaped design, they permit both wheels to be retracked from either or both sides of the rail at the same time. As the car is pulled across the device, the derailed wheels are channeled back onto the tracks.
Industry:Mining
A small locomotive for use in underground haulage, sometimes consisting of a car bearing a powerful electric motor, built very low and operated through a trolley. May also be operated by electricity from batteries.
Industry:Mining
A small magnetic compass held in the hand when in use and equipped with peep sights and a glass prism so arranged that the magnetic bearing or azimuth of a line can be read (through the prism) from a circular graduated scale at the same time that the line is sighted over.
Industry:Mining
A small metal keg for black blasting powder, usually having a capacity sufficient for 25 lb (13.5 kg) of powder. Compare: powder barrel
Industry:Mining
A small metal tag or wooden block placed in the core box at the bottom of the core recovered from each run, on which is marked the depth at which the core was cut in the borehole.
Industry:Mining
