- 行业: Mining
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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 ...
Strata not differentiated between the Permian and Carboniferous systems, particularly in regions where there is no conspicuous stratigraphic break and fossils are transitional.
Industry:Mining
Strata not differentiated between the Permian and Triassic systems, particularly in regions where the boundary occurs within a nonmarine, red beds succession.
Industry:Mining
Stream tin, or cassiterite pebbles in the gravel along the courses of valleys and rivers on the bedrock. Generally, the purest tin ore. See: stream tin
Industry:Mining
Street clothes into which the miner changes on emerging from a mine.
Industry:Mining
Stress fields can be represented by lines, each of which represents a definite force, so that their distance apart is a measure of the intensity of stress. The concept is similar to that of a magnetic field represented by lines of force.
Industry:Mining
Stress in a structural member due to a rise or fall of temperature.
Industry:Mining
Stress rings are force lines drawn on the cross section of an excavation to indicate the distribution of the additional stress in the rock caused by that excavation.
Industry:Mining
