- Industry: 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 ...
Irregular, saw-shaped terminations of crystals (such as of augite) or grains due to intrastratal solution.
Industry:Mining
Irregularities in a lattice structure that affect resistance to crushing. Microdefects are due to irregular distribution of ions. Macrodefects are incipient strain areas or discontinuities in an otherwise regular lattice. Mosaic defects are orderly blocks of regular lattice that are packed together to form a larger and imperfect particle.
Industry:Mining
Irregularities of gemstone crystallization and subsequent breakage or separation, such as cleavage cracks, clouds, or feathers.
Industry:Mining
Irreversible sorption, an adsorbate being held as a product of chemical reaction with an absorbent. Activation energy is relatively high.
Industry:Mining
Issued by regulatory representatives alleging a specific condition or practice that violates mining, maritime, construction, environmental, or general industry standards.
Industry:Mining
It consists of a plastic incendiary composition extruded around a central copper wire. An iron wire is added to give greater strength, and the whole is then enclosed in a thin extruded plastic coating. The diameter of slow cord is 0.07 in (1.8 mm).
Industry:Mining
It is a common occurrence to hear miners talk of gas cutting the roof and causing it to weaken; however, this condition is seldom encountered. There are some seams where gas does cut the roof, generally where top coal is left in gassy seams. The most common cause of roof cutting is its exposure to air. Gunite or painting of the top helps a condition of this kind.
Industry:Mining
It. A fine-grained Permian sandstone suitable for sawing and finishing.
Industry:Mining
Jointed rock structures, the backs (joints) of which run in lines parallel to the strike of the strata, the cutters (cross joints) crossing them at about right angles.
Industry:Mining
Jurassic to Early Cretaceous rocks, characteristic of the Pacific coastal ranges of California, composed primarily of sandstones, cherts, serpentinites, and glaucophane schists. The Franciscan should not be visualized as a formation or sequence with ordinary physical, spatial, and temporal coherence, but rather as a disorderly assemblage of various characteristic rocks that have undergone unsystematic disturbance; a melange. The formation includes deep-water sediments and mafic marine volcanic material, locally accompanied by masses of serpentinite.
Industry:Mining
