- المجال: 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 tufa deposit of fibrous calcite pseudomorphous after an unknown precursor occurring on an enormous scale in northwestern Nevada; also occurs about Mono Lake, CA. It forms layers of interlaced pale yellow or light brown crystals, commonly skeletal with pyramidal terminations.
Industry:Mining
A tuff containing both pyroclastic and detrital material, but predominantly pyroclasts.
Industry:Mining
A tuff that consists of fragments of crystals and volcanic glass. Compare: crystal tuff; vitric tuff.
Industry:Mining
A tuff that consists predominantly of volcanic glass fragments. Compare: crystal tuff; crystalvitric tuff.
Industry:Mining
A tuff whose pyroclastic fragments are in the place in which they fell, rather than having been washed into place after they landed.
Industry:Mining
A tumbling mill used in dry grinding, from which finished material is removed by means of regulated air currents that can be so controlled as to produce a closed circuit.
Industry:Mining
A tungsten carbide drill bit for percussive boring. The cutting edge is concave, while in the conventional type the edge is convex. The new bit remains sharper for a longer period before regrinding becomes necessary and gives a higher penetration speed.
Industry:Mining
A tungsten carbide drill bit for percussive boring. The cutting edge is concave, while in the conventional type the edge is convex. The new bit remains sharper for a longer period before regrinding becomes necessary and gives a higher penetration speed.
Industry:Mining
