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United States Bureau of Mines
行业: Mining
Number of terms: 33118
Number of blossaries: 0
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 ...
Water-filled plastic bags with a self-sealing valve classified as a permissible stemming device by the U.S. Mine Safety and Health Administration.
Industry:Mining
Watertight stone walling of a shaft cemented at the back.
Industry:Mining
Wavelengths in the electromagnetic spectrum too short or too long to be detected by the human eye; e.g., ultraviolet and infrared light. Compare: visible light
Industry:Mining
Waves that travel only on a free surface where the solid elastic materials transmitting them are bounded by air or water.
Industry:Mining
Weak coal pillars left in workings to give warning of an impending collapse.
Industry:Mining
Weak forces in crystal structures caused by induced dipoles resulting from juxtaposition of molecules; e.g., the bonding between electrostatically neutral layers in the talc structure.
Industry:Mining
Weak form of dynamite, based on nitroglycerin and a semiactive carrying dope.
Industry:Mining
Wear of abrasive grains in grinding such that sharp edges gradually become rounded. A grinding wheel that has undergone such wear usually has a glazed appearance.
Industry:Mining
Weathered argillaceous material forming a layer immediately overlying bedrock.
Industry:Mining
Weave used in screens and filters, in which two or more warp threads interweave one wood thread.
Industry:Mining
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