- 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 ...
Detailed analysis of a proven placer deposit that should determine: (1) the volumetric measurements of both overburden and gravel; (2) the estimation of the gold or other mineral contents; (3) the average value of the area in pence, cents, carats, or other unit per unit of volume; and (4) all possible information regarding the nature of the overburden and gravel--i.e., whether it is clayey, free wash, etc.--as well as of the bedrock.
Industry:Mining
Determination of flow rate and channels taken by water by the introduction of suitable chemicals upstream and measurement of dilution. (Radiotracers and fluorescin are also used for tracing flow direction.)
Industry:Mining
Determining the proper proportions of ore, coke, and limestone for a blast furnace charge.
Industry:Mining
Deuterium oxide, D<sub>2</sub>O , in which D is the symbol for deuterium (heavy hydrogen or hydrogen 2). Water in which ordinary hydrogen atoms have been replaced by deuterium atoms. Natural water contains 1 heavy-water molecule per 6,500 ordinary water molecules. Deuterium oxide has a low neutron absorption cross section; hence, it is used as a moderator in some nuclear reactors.
Industry:Mining
Developing, building, and operating plants in which materials are chemically worked up to desired end products.
Industry:Mining
Development of bauxite from primary aluminum silicates (such as feldspars) or from secondary clay minerals under aggressive tropical or subtropical weathering conditions of good surface drainage, such as the dissolving (usually above the water table) of silica, iron compounds, and other constituents from alumina-containing material.
Industry:Mining
Development of, or conversion into, gypsum; e.g., the hydration of anhydrite.
Industry:Mining
Deviation of portions of a radiation beam by scattering centers in the medium through which the beam passes. In ultrasonics, it occurs by reflection, refraction, or diffraction at any acoustical discontinuity comparable in size with, or larger than, the wave length used; in radiography, the scatter occurs by the Compton, photoelectric, and pairproduction processes.
Industry:Mining
Device or signal system that warns underground workers of dangerous concentration of combustible gases.
Industry:Mining
