- 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 ...
High-temperature, high-pressure remelting of preexisting rock to form migma. Compare: anatexis
Industry:Mining
Hills and valleys in electrolytic deposits caused by streams of hydrogen or other gas rising continuously along the surface of the deposit while it is forming.
Industry:Mining
Hinged doors at the bottom of a cupola furnace, which drop down to allow the furnace to be cleaned.
Industry:Mining
Historically, a plot of the airflow friction coefficient against the Reynolds number is referred to as a Stanton diagram.
Industry:Mining
Hoisting device having two cable spools or drums rotating in opposite directions.
Industry:Mining
Hole drilled by means of an apparatus known as a well drill, or similar to that, and used in groups for blasting on a comparatively large scale. Such holes are usually 5 in or 6 in (12.7 cm or 15.2 cm) in diameter and from 30 to 150 ft (9.1 to 45.7 m) deep.
Industry:Mining
Hole to be blasted that contains explosive material and a detonator; for blasting operations under the jurisdiction of the Mine Safety and Health Administration (MSHA), charged holes must be detonated within 72 h of charging unless prior approval has been obtained from MSHA (CFR 30, 1988 - 56.6094).
Industry:Mining
Holes bored into the face at an angle which may vary from 30 degrees to 60 degrees to the line of face and 6 to 7 ft (1.8 to 2.1 m) long. The distance between shot holes, the angle of the hole, and the charge, depend to a great extent on the hardness of the coal. As the coal grows harder, the burden on each shothole must be reduced by placing the shotholes closer together and reducing the angle of the hole to the face.
Industry:Mining
Holes drilled around the cut to enlarge the cut area so that the trimmers may break out the ground to the required dimensions. The positioning and number of the easer holes will depend upon the pattern of the cut shots.
Industry:Mining
Holes in a ring around one central hole used to carry a cavity forward, usually six.
Industry:Mining
