- Sektör: 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 former name for ulexite, a triclinic mineral, NaCaB<sub>5</sub>O<sub>6</sub>(OH)<sub>6</sub>.5H<sub>2</sub>O ; soft; forms silky white, saline crusts and masses of extremely fine acicular crystals; in saline lake deposits as in Nevada and Chile.
Industry:Mining
A former name for yttromicrolite, a discredited mineral name for an amorphous mixture of calcium sulfate, tantalite, and heterogeneous microlite.
Industry:Mining
A former name for zincite, a red to yellow brittle mineral; (Zn,Mn)O. It is an ore of zinc, as in New Jersey where it is associated with franklinite and willemite.
Industry:Mining
A former named for gersdorffite, an isometric mineral, NiAsS ; cobaltite group; massive; sp gr, 5.9 to 6.0; in sulfide veins intergrown with maucherite, nickeline, and chalcopyrite at the Garson and Falconbridge Mines, Sudbury, ON, Can.; with cobaltite and rammelsbergite in the silver-arsenide ores of Cobalt, ON, Can.; a source of nickel.
Industry:Mining
A former outcrop concealed by or buried beneath younger unconformable strata.
Industry:Mining
A former spelling of kyanite, a triclinic mineral, 4(Al<sub>2</sub>SiO<sub>5</sub>) ; trimorphous with andalusite and sillimanite; in blades that are distinctly harder across than along; a common rock-forming mineral in schist and gneiss.
Industry:Mining
A forming or swaging tool having a semicylindrical groove; a blacksmith's swage or collar tool.
Industry:Mining
A formula used for calculating the thickness of tubbing: T = 0.03 + HD/50,000, where T is the required thickness of tubbing in feet, H is the vertical depth in feet, D is the diameter of the shaft in feet, and 0.03 is an allowance for possible flaws or corrosion.
Industry:Mining
