- 行业: Mining
- Number of terms: 33118
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- 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 ...
Local name in Western Australia for the formation consisting essentially of pre- Cambrian rocks made up mainly of jasperoid quartzites and dolomite. Crocidolite asbestos occurs in this formation as cross-fiber seams in lodes in stratified ferruginous quartzites and shales with occasional bands of dolomite.
Industry:Mining
Locally increased stress at that point in a structural load-bearing member where the section changes at a sharp angle.
Industry:Mining
Locus of the points through which the resultant forces in an arch or retaining wall pass.
Industry:Mining
Lode that occupies a shear zone. Such a zone has no definite walls, the ore gradually shading off into country rock. It is probable that the gold of some rich alluvial fields came from shear zones.
Industry:Mining
Logwood digested in an aqueous solution of aluminum chloride; used to distinguish calcite and dolomite. Calcite and aragonite are stained violet after treatment for about 10 min, but dolomite remains unchanged.
Industry:Mining
Long arm made of a flexible board for the suspension of a shaker screen.
Industry:Mining
Long period delays used in delay blasting underground and generally available in intervals of seconds.
Industry:Mining
Long wooden edges for adjusting linings in sinking shafts during the operation of fixing the lining.
Industry:Mining
Long, inclined trough or launder containing riffles in the bottom that provide a lodging place for heavy minerals in ore concentration. The material to be concentrated is carried down through the sluices on a current of water. Sluiceboxes are widely used in placer operations for concentrating elements such as gold and platinum, and minerals such as cassiterite, from stream gravels.
Industry:Mining
