- Industry: 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 ...
In tectonics, said of a recurrence of forces and movement along lines or over areas affected by similar forces in a previous period; overprint.
Industry:Mining
In testing or valuation of a mineral deposit, samples large enough and average in composition as to be considered representative of a specified volume of the surrounding orebody. Blended large samples from different exposures are not necessarily representative, since the mineral structure may have varied so as to introduce special problems from area to area in treatment.
Industry:Mining
In the "Becke test" a bright line, visible under a microscope under plane polarized light, that separates substances of different indices of refraction.
Industry:Mining
In the asbestos products industry, one who twists together two or more strands of wire and asbestos yarn for use in weaving asbestos products, such as brake linings.
Industry:Mining
In the basic Bessemer process of steelmaking, the continuation of the blowing cycle after the oxidation of the silicon, manganese, and carbon content of the charge is complete, and during which the phosphorus and sulfur contents of the charge are reduced.
Industry:Mining
In the Bessemer process of steelmaking, the period of the blowing cycle during which the oxidation of the silicon, manganese, and carbon content of the charge takes place.
Industry:Mining
In the block caving mining method, the ore zone is undercut until the ore material breaks apart and falls under gravity load into draw points. If the ore zone is reluctant to fall under gravity loading, the fall is sometimes induced with explosives set in boreholes drilled into the orebody. This induced caving is generally accomplished from drifts above the ore zone.
Industry:Mining
In the case of a centrifugal fan, the reversal arrangement may consist of an emergency drift connecting the fan with the downcast shaft. The drift is normally sealed off by airtight doors. In the case of an axial-flow fan, it is only necessary to reverse the rotation of the fan. This arrangement entails a reduction in volume and pressure in the reversed airflow.
Industry:Mining
