- Industry: Mining
- Number of terms: 33118
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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 ...
In pillar extraction, it refers to a stall or roadway working a slice or lift of coal along the side of a pillar.
Industry:Mining
In placer mining, applied to streams brought to the pit in ditches, not under pressure.
Industry:Mining
In placer mining, the minerals recoverable from the alluvium. These include cassiterite, gold, diamond, gemstones, zirconia, rutile, monazite, and platinum.
Industry:Mining
In plant design, calculations of required capacities, machine sizes, etc., from data obtained in batch and pilot testing.
Industry:Mining
In plastics, rigid material that temporarily becomes soft when heated and can then be molded into a shape that it will retain on cooling. Ant. for thermosetting, a material that reacts chemically on heating (curing) and is then resistant to deformation when reheated.
Industry:Mining
In polarized-light microscopy with crossed polars and an anisotropic mineral in the light train, when the two electric vectors (permitted light or vibration directions) of a 1135 randomly oriented crystal are each parallel to those of the polars, no light is transmitted and the crystal is at extinction. Isotropic crystals and anisotropic crystals viewed parallel to an optic axis remain extinct upon stage rotation, while randomly oriented anisotropic crystals go extinct four times upon stage rotation of 360 degrees . Compare: anisotropy; extinction angle; extinction direction; inclined extinction; optic axis; parallel extinction; undulatory extinction.
Industry:Mining
In polarized-light microscopy, a method or test for determining relative indices of refraction between two adjacent mineral grains or between a mineral grain and its host medium; e.g., Canada balsam, Lakeside cement, an epoxy resin, or an immersion oil of known index of refraction. On defocusing by increasing the working distance between 274 the microscope stage and the objective lens, the Becke line moves toward the higher index of refraction. Compare: van der Kolk method
Industry:Mining
In polarized-light microscopy, an optical device of variable compensation for analysis of birefringence. Compare: accessory plate
Industry:Mining
In polarized-light microscopy, the angular position of extinction with respect to a crystallographic axis, a crystal face, a cleavage plane, or a twin plane. Compare: extinction
Industry:Mining
