- 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 ...
The usual die casting process in which the molten metal is forced into highly finished molds under heavy pressure by plungers, compressed air, or combined methods.
Industry:Mining
The usual method of setting timber or steel supports in mines--they are spaced from 2 to 5 ft (0.6 to 1.5 m) apart, with laggings and struts to secure the ground between each set. The method is used in ground that does not crumble or flow.
Industry:Mining
The utilization based on the phenomena of conduction of electricity in a vacuum (thermionic valves), in a gas (thyratrons), and in semiconductors (transistors).
Industry:Mining
The valuable constituents of an ore; their percentage in an orebody, or assay grade; their quantity in an orebody, or assay value.
Industry:Mining
The value of a property (e.g., density or size) at which a separation into two fractions is desired or achieved.
Industry:Mining
The value used when calculating the slenderness ratio of pillars and struts. If A is the cross-sectional area in inches of the pillar or strut and I is its moment of inertia, the radius of gyration is (I/A), generally known as K.
Industry:Mining
The valueless minerals in an ore; that part of an ore that is not economically desirable but cannot be avoided in mining. It is separated from the ore minerals during concentration. Compare: ore mineral
Industry:Mining
The valve that controls the alternate admission and release of compressed air to each cell of a Baum-type washbox.
Industry:Mining
The valve-timing cycle determining the periods of air admission and exhaust.
Industry:Mining
