- Industry: 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 ...
Igneous rock formed deep within the Earth under the influence of high heat and pressure, hypogene rocks; distinguished from eruptive rock formed at the surface.
Industry:Mining
Igniter cord consisting of three central paper strings coated with a black powder composition and held together with cotton countering. These are then enclosed in an extruded layer of plastic incendiary composition and finished with an outer plastic covering. The overall diameter of fast igniter cord is approximateiy 0.10 in (2.5 mm).
Industry:Mining
Illite that has lost much of its potassium as the result of prolonged leaching.
Industry:Mining
Imaginary dome of rock above underground working, matched by a similar inverted dome below the stope. The dome lies inside the zone of stress due to an unsupported ground, but it is partially destressed owing to expansion and peripheral transfer of load.
Industry:Mining
Imaginary lines passing through a crystal in important symmetry directions, intersecting in the origin at the center of the crystal. The axes are usually three in number, and they are chosen to act as a frame of reference by means of which the relative positions of the crystal faces can be described.
Industry:Mining
Immersion of iron or steel articles in a bath of melted spelter, to produce a zinc coating.
Industry:Mining
Imperfect quartz crystals that meet at an angle of a crystallographic plane so that a cross section somewhat resembles a feather.
Industry:Mining
