- 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 ...
An English term for chocks, or blocks spiked into the corner of a shaft to form a bearing for the side-walling piece, or the blocks used in headings to separate the cap and poling board.
Industry:Mining
An enlargement of a level near a shaft from which ore, coal, or rock may be hoisted and supplies unloaded.
Industry:Mining
An entry driven at right angles to the face cleat and parallel to the butt cleat.
Industry:Mining
An entry driven downhill so that water will stand at the face. If it is driven directly down a steep dip it becomes a slope.
Industry:Mining
An entry driven to intersect another and furnish a more convenient outlet for the coal. Compare: cutoff
Industry:Mining
An entry in which coal is being mined from a portion thereof or from connected sections.
Industry:Mining
An entry widened or slabbed to provide a working place for a second miner.
Industry:Mining
An epidote having the composition of zoisite, Ca<sub>2</sub>Al<sub>3</sub>(SiO<sub>4</sub>)<sub>3</sub>(OH) ; monoclinic; crystals striated.
Industry:Mining
An epidote-rich granite, which also contains pink orthoclase, quartz, also minor opaque oxides, apatite, and zircon. The name is derived from the type locality, the Unaka Range, Great Smoky Mountains, in eastern Tennessee.
Industry:Mining
An epoch of the early Tertiary Period, after the Eocene and before the Miocene; also, the corresponding worldwide series of rocks. It is considered to be a period when the Tertiary is designated as an era.
Industry:Mining
