- 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 ...
The expansion of certain nonmetallic materials by heating until the exterior of the particle or shape becomes sufficiently pyroplastic or melted to entrap gases generated on the interior by the decomposition of gas-producing components.
Industry:Mining
The experimental shots and rounds fired in a sinking pit, tunnel, opencast, or quarry to determine the best drill-hole pattern to use. This is carried out when hard rocks are exposed.
Industry:Mining
The exploitation of alluvial deposits by dredging, hydraulicing, or drift mining.
Industry:Mining
The exploitation of coal or mineral deposits by underground mining methods. "Deep" is often interpreted as meaning 5,000 ft (1.5 km) or more, where stresses are high enough to cause sloughing of development openings, not to mention walls and faces in stopes. However, tectonic horizontal stresses are greater than gravitational force in many areas. Hence deep conditions can exist at lesser depths. Indeed, severe rock bursting caused the closure of a Canadian mine operating at depths of 500 to 700 ft (152 to 213 m). Also, rocks with low strength will produce deep failure patterns at modest depths, e.g., in Saskatchewan potash mines.
Industry:Mining
The exploitation of the economic concentrations of the heavy minerals rutile, zircon, monazite, ilmenite, and sometimes gold, which occur in sand dunes, beaches, coastal plains, and deposits located inland from the shoreline. High-grade concentrate is usually obtained from low-grade material by the use of suction dredges and spiral concentrators.
Industry:Mining
The exploration of an area in which geophysical properties and relationships unique to the area are mapped by one or more geophysical methods.
Industry:Mining
The exploratory drilling of boreholes in the search for minerals and petroleum.
Industry:Mining
The explosive core of detonating cord, expressed as the number of grains of explosive per foot or grams per meter.
Industry:Mining
The expression in a patent according to the official plat of survey of the land returned to the general land office by the surveyor general refers to the description of the land as well as to the quantity conveyed.
Industry:Mining
