- 업종: 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 group or series of sedimentary rocks having some characteristic in common; specif. coal measures. The term apparently refers to the old practice of designating the different seams of a coalfield by its measure or thickness.
Industry:Mining
A grouping of minerals arranged according to their persistence in nature; i.e., to their resistance to alteration or destruction by weathering, abrasion during transportation, and postdepositional solution; e.g., olivine (least stable), augite, hornblende, biotite (most stable). The most stable minerals are those that tend to be at equilibrium at the Earth's surface.
Industry:Mining
A grouping of minerals arranged according to their persistence in nature; i.e., to their resistance to alteration or destruction by weathering, abrasion during transportation, and postdepositional solution; e.g., olivine (least stable), augite, hornblende, biotite (most stable). The most stable minerals are those that tend to be at equilibrium at the Earth's surface.
Industry:Mining
A guide for making the crosshead of an engine move in a parallel line with the cylinder axis.
Industry:Mining
A gunpowder or black powder pressed and cut into large cubical grains so as to make it slow burning.
Industry:Mining
A gutter excavated in the floor of a gangway or airway to carry the water to the sump, or out to the surface.
Industry:Mining
A half-cylinder member, about 5 in (12.7 cm) long, coupled to the lower end of a Hall- Rowe deflection wedge, by means of which the deflection wedge may be oriented in a specific manner in reference to a matching half-cylinder surface on the upper end of the wedge (drive wedge). This is driven into the wooden plug placed about 8 ft (2.4 m) below the point in a borehole where a deflection is to be made.
Industry:Mining
A half-cylinder member, about 5 in (12.7 cm) long, coupled to the lower end of a Hall- Rowe deflection wedge, by means of which the deflection wedge may be oriented in a specific manner in reference to a matching half-cylinder surface on the upper end of the wedge (drive wedge). This is driven into the wooden plug placed about 8 ft (2.4 m) below the point in a borehole where a deflection is to be made.
Industry:Mining
