- 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 ...
An explosive used to break rock fragments by blockholing or mudcapping methods.
Industry:Mining
An exposure limit published and enforced by the U.S. Occupational Safety and Health Administration (OSHA) as a legal standard.
Industry:Mining
An expression of the average particle size of a sediment or rock, obtained graphically by locating the diameter associated with the midpoint of the particle-size distribution; the middlemost diameter that is larger than 50% of the diameters in the distribution and smaller than the other 50%.
Industry:Mining
An expression of variety in sizes of grains that constitute a granular material.
Industry:Mining
An expression used on the Comstock lode to designate rock better than waste but too poor to be classed as "pay ore" or even "second-class ore." It became a custom to throw a wooden wedge onto a car containing very low grade ore, hence the term wedge rock.
Industry:Mining
An expression used on the Comstock lode to designate rock better than waste but too poor to be classed as "pay ore" or even "second-class ore." It became a custom to throw a wooden wedge onto a car containing very low grade ore, hence the term wedge rock.
Industry:Mining
An extended version of the Udden grade scale, adopted by Chester K. Wentworth (1891- 1969), U.S. geologist, who modified the size limits for the common grade terms but retained the geometric interval or constant ratio of 1/2. The scale ranges from clay particles (diameter less than 1/256 mm) to boulders (diameter greater than 256 mm). It is the grade scale generally used by North American sedimentologists.
Industry:Mining
An extensive level barren tract of land covered with a whitish efflorescence of sodium carbonate (natron), as in parts of southwestern and western United States and Mexico.
Industry:Mining
