- 行业: 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 ...
A channel dispersion pattern in which the minor elements of the walls of the channels have been modified. Wall-rock dispersion patterns of importance usually are those formed at the time the orebodies were being deposited.
Industry:Mining
A channel excavated at the top of earth cuts, or at the foot of slopes, or at other critical places to intercept surface flow; a catch drain.
Industry:Mining
A channel in a sand mold having over it a bridge that removes the dross from the molten metal as it passes through.
Industry:Mining
A channel or groove incised into and across the face of a bit, the depth and/or width of which gradually increases from the inside to the outside walls of the bit.
Industry:Mining
A channel or spillway designed to carry surplus water from a dam, reservoir, or aqueduct in order to prevent overflow.
Industry:Mining
A channel-type, steel-arch support consisting of three elements or sections set close to the face of a tunnel. These elements overlap and yield by sliding one upon the other under the constraint of bolted clamps. The center or crown element is usually foreset to give temporary protection until the complete arch is erected.
Industry:Mining
A characteristic association or occurrence of minerals or mineral assemblages in ore deposits, connoting contemporaneous formation. Compare: mineral sequence.
Industry:Mining
A characteristic of some minerals where substitution for one or more elements by others does not change the crystal structure. An example is the substitution of iron for zinc in sphalerite, wherein the iron content can range up to more than 15% without changing the sphalerite structure. Similarly, iron, manganese, and magnesium ions can replace each other in the calcite structure common to siderite, rhodochrosite, and magnesite.
Industry:Mining
A charge in a borehole separated by a quantity of inert material for the purpose of distributing the effect, or for preventing part of the charge blowing out at a seam or fissure, in which case the inert material is placed so as to include the seam.
Industry:Mining
