- 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 ...
In dissolution of gold by dilute aerated cyanide solution this reads: 4Au + 8NaCN + O<sub>2</sub>+ 2H<sub>2</sub>O = 4NaAU(CN)<sub>2+4</sub>NaOH . Analogous equation is given for silver. Other mechanisms have been suggested by Janin and Bodlaender, the latter requiring two stages of reaction with the intermediate formation of hydrogen peroxide.
Industry:Mining
Comprises the study of the relative motion between the parts of a machine and the study of the forces that act on those parts.
Industry:Mining
Pertaining to or composed dominantly of the ferromagnesian rock-forming silicates; said of some igneous rocks and their constituent minerals. Compare: basic; felsic.
Industry:Mining
Consists of two concentric glass tubes, each expanded into a large bulb at the upper end. The lower end of the outer tube is sealed, and the inner tube reaches nearly to the bottom of the outer tube. Two liquids are used, and the movement of the interface between the 3421 two liquids down the central tube is used as an index against which the change in pressure is measured.
Industry:Mining
Essentially a U-type gage employing a micrometer to measure the change in inclination of the gage from its zero or datum position. Normally, micromanometers are used in the laboratory for such purposes as the calibration of secondary manometers and, in conjunction with pressure measurement, in low-speed atmospheric wind tunnels.
Industry:Mining
Pushing of cars by manpower. It is limited to mines of small output, to prospects, and to work where mechanical haulage would not be justified.
Industry:Mining
Isotropic, homogeneous rock with a strength that does not vary appreciably from point to point. Typical examples are igneous rocks such as granite and diorite; metamorphic 1921 rocks such as marble and quartzite; and some thick-bedded sedimentary rocks.
Industry:Mining
Full subsidence expressed as a fraction of the thickness of coal seam extracted.
Industry:Mining
