- 업종: 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 ...
A direction of more than 45 degrees to the main natural line of cleat or cleavage in the coal. Also spelled horn. Compare: long awn.
Industry:Mining
A direction of single refraction in a doubly refracting mineral. Hexagonal and tetragonal minerals have one such axis, and are termed uniaxial; rhombic, monoclinic, and triclinic minerals have two optic axes and are thus biaxial. Compare: extinction.
Industry:Mining
A discharge chute equipped with a screen section, either stationary or vibrating, to remove the finer portions of the material being handled from the major line of flow.
Industry:Mining
A discredited mineral name for an amorphous mixture of calcium sulfate, tantalite, and heterogeneous microlite.
Industry:Mining
A discredited mineral since it is a mixture of wittichenite and emplectite.
Industry:Mining