- المجال: 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 structure resembling network or latticework that is found in certain alteration products of minerals.
Industry:Mining
A structure resembling network or latticework that is found in certain alteration products of minerals.
Industry:Mining
A structure resembling network or latticework that is found in certain alteration products of minerals.
Industry:Mining
A structure that is associated with a combination of folding and nearly vertical faulting, in which crustal material that has been fractured into elongate strips tends to drape over the uplifted areas to resemble anticlines and to crumple into the downthrown areas to resemble synclines.
Industry:Mining
A structure that originated after the deposition or emplacement of the rock in which it is found, such as a fault, fold, or joint produced by tectonic movement; esp. an epigenetic sedimentary structure, such as a concretion or nodule produced by chemical action, or a sedimentary dike formed by infilling. Compare: primary structure
Industry:Mining
A structure, observed in certain extrusive igneous rocks, that is characterized by discontinuous pillow-shaped masses ranging in size from a few centimeters to a meter or more in greatest dimension (commonly between 30 cm and 60 cm). The pillows are close-fitting, the concavities of one matching the convexities of another. The spaces between the pillows are few and are filled either with material of the same composition as the pillows, with clastic sediments, or with scoriaceous material. Grain sizes within the pillows tend to decrease toward the exterior. Pillow structures are considered to be the result of subaqueous extrusion, as evidenced by their association with sedimentary deposits, usually of deep-sea origin.
Industry:Mining
A strut set at an angle to the vertical to support timbering during excavation.
Industry:Mining
A study of factors in any process or device involving radiation that could cause danger to any persons working near the process or device.
Industry:Mining
A study to provide the essential data on which mine management can operate in making the most effective use of workpower, machines, and materials. Method study has been applied in the mining industry for many years, although sometimes under different names.
Industry:Mining
A stull so placed as to offer support or reinforcement for a stull, prop, or other timber.
Industry:Mining
