4 Terms
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Mineral mining
The extraction of valuable minerals or other geological materials from the earth for economic interests.
Industry: Mining
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Mineral mining
permissible exposure limit
Mining; General mining
An exposure limit published and enforced by the U.S. Occupational Safety and Health Administration (OSHA) as a legal standard.
median diameter
Mining; General 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 ...
uniformity coefficient
Mining; General mining
An expression of variety in sizes of grains that constitute a granular material.
wedge rock
Mining; General 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 ...
pin
Mining; General 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 ...
Wentworth grade scale
Mining; General 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 ...
