- 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 ...
A test to determine the hardness of metals by measuring the rebound from them of a standard diamond-tipped hammer dropped from a given height.
Industry:Mining
A test to determine the relative densities of noncohesive soils, sands, or silts; e.g., the standard penetration test that determines the number of blows required by a standard weight, when dropped from a standard height (30 in or 76.2 cm per blow), to drive a standard sampling spoon a standard penetration (12 in or 30.5 cm); or the dynamic penetration test, which determines the relative densities of successive layers by recording the penetration per blow or a specified number of blows.
Industry:Mining
A test to determine whether, and to what extent, the course of a well deviates from vertical.
Industry:Mining
A test to determine whether, and to what extent, the course of a well deviates from vertical.
Industry:Mining
A test to distinguish calcite from aragonite. After boiling for 20 min in a cobalt nitrate solution, aragonite becomes lilac, the color showing in thin section, while calcite and dolomite become pale blue, the color not showing in thin section.
Industry:Mining
A test to indicate the effect of weather on coal, in which the coal is alternately exposed to freezing, wetting, warming, and light; the alternation may be varied to suit. This test may be applied to other bituminous materials.
Industry:Mining
A test used in microscopy to determine the index of refraction of a mineral grain relative to that of an immersion liquid. When transmitted light is blocked, the grain acts as a lens and the ocular inverts the image of the obstacle, causing a shadow to appear on the same side as the obstacle when the grain has the higher refractive index, but on the opposite side when the grain has the lower index.
Industry:Mining
A test used in microscopy to determine the index of refraction of a mineral grain relative to that of an immersion liquid. When transmitted light is blocked, the grain acts as a lens and the ocular inverts the image of the obstacle, causing a shadow to appear on the same side as the obstacle when the grain has the higher refractive index, but on the opposite side when the grain has the lower index.
Industry:Mining
A test used to determine impact sensitivity of an explosive conducted by allowing standard hammer weights to fall on an amount of confined explosive charge and measuring the fall height required to decompose or detonate the charge.
Industry:Mining
A test used when selecting materials for stabilized road construction and concrete. Soil, after pretreatment, is shaken up in water and allowed to settle out. The change in specific gravity of the suspended matter with time is measured, and the equivalent diameter is calculated from Stokes' law.
Industry:Mining
