- 行业: 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 ...
The carrying down by a precipitate of substances that are normally soluble under the condition of precipitation.
Industry:Mining
The catalytic action of bacteria, such as Thiobacillus ferroxidans and Thiobacillus thiooxidans to accelerate chemical oxidation reactions by as much as 10<sub>6</sub>times those of chemical reactions alone; esp. useful in leaching copper and uranium systems.
Industry:Mining
The cauliflowerlike blowout or outcrop of a lode that extends beyond the limits of the defined vein deeper down.
Industry:Mining
The cementation sinking method. The process was introduced into Great Britain in 1911.
Industry:Mining
The cementing of casing in the hole. The cement is introduced between the casing and the wall of the hole and then allowed to harden, thus sealing off intermediate formations and preventing fluids from then entering the hole. It is customary to set casing in the completion of a producing well.
Industry:Mining
The central part of the Earth's core, extending from a depth of about 5,100 km to the center (6,371 km) of the Earth; its radius is about one-third of the whole core. The inner core is probably solid, as evidenced by the observation of S waves that are propagated in it, and because compressional waves travel noticeably faster through it than through the outer core. Density ranges from 10.5 to 15.5 g/cm<sub>3</sub>. It is equivalent to the G layer. Compare: outer core
Industry:Mining
The central point about which matter accumulates to form a larger mass, esp. of a growing crystal or pearl. Plural: nuclei.
Industry:Mining
The central, removable, and replaceable portion or pilot of a noncoring or other type of bit. Compare: core
Industry:Mining
The cgs (centimeter-gram-second) unit of magnetic flux. One maxwell = 10 <sub>-8</sub>Wb, or the flux through 1 cm<sub>2</sub>normal to a field of magnetic induction of 1 Gs.
Industry:Mining
