- 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 ...
Sound waves in the surface layers of the ocean tend to be refracted downward due to decrease of temperature with depth. In deep waters the sound waves are refracted upward by high and increasing pressure, which has a greater influence on the resulting refractive index of these layers than the decreasing temperature. The result is the formation at mid-depth of a wave guide that permits compressional waves of acoustic frequencies to travel great distances.
Industry:Mining
Source material, special nuclear material, or byproduct material received, possessed, used, or transferred under a general or special license issued by the Nuclear Regulatory Commission.
Industry:Mining
(Spanish origina) A deep-red ocher originally from Andalusia, Spain, similar to Indian red. Used as a pigment and in polishing glass and metals. Also spelled almagre.
Industry:Mining
Sp. Any rock or mineral; tierra blanca (Mex.), a calcareous tufa; tierra de batan, fuller's earth; tierra de fluor (Venez.), a bed of reddish clayey earth; tierra de porcelana, china clay; tierra pesada, heavy spar.
Industry:Mining
(Spanish origina) Land league used in the original surveys of the Philippines, California, and Texas. It is equal to 2.63 miles or 4.24 km.
Industry:Mining
(Spanish origina) Lump ore. The term is used at the mercury mines in California.
Industry:Mining
