- Industria: 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 ...
A roast in which conditions in a furnace allow sulfur in feed to recombine with calcined products to form sulfates.
Industry:Mining
A roasting process in which the ore or concentrate enters at the top of a multiple hearth roaster and drops from hearth to hearth in succession until it is discharged at the bottom. 1480 In the downward progress of the ore, the sulfide particles are roasted as they come in contact with the heated air.
Industry:Mining
A rock composed chiefly of sutured quartz crystals of pegmatitic or hydrothermal origin and commonly of variable size.
Industry:Mining
A rock composed essentially of ilmenite and apatite, with or without rutile. The ratio of ilmenite to apatite varies widely. Compare: ilmenitite
Industry:Mining
A rock resulting from the consolidation of loose sediment that has accumulated in layers; e.g., a clastic rock (such as conglomerate or tillite) consisting of mechanically formed fragments of older rock transported from its source and deposited in water or from air or ice; or a chemical rock (such as rock salt or gypsum) formed by precipitation from solution; or an organic rock (such as certain limestones) consisting of the remains or secretions of plants and animals. The term is restricted by some authors to include only those rocks consisting of mechanically derived sediment; others extend it to embrace all rocks other than purely igneous and completely metamorphic rocks, thereby including pyroclastic rocks composed of fragments blown from volcanoes and deposited on land or in water.
Industry:Mining
A rock composed of quartz and albite, formed by interaction between a nephelinesyenite magma and graywacke.
Industry:Mining
A rock composed primarily of particles or fragments detached from preexisting rocks either by erosion or by weathering; specif. a sedimentary rock having more than 50% detrital material. Compare: chemical rock
Industry:Mining
A rock consisting almost wholly of serpentine-group minerals, e.g., antigorite and chrysotile or lizardite, derived from the alteration of ferromagnesian silicate minerals, such as olivine and pyroxene. Accessory chlorite, talc, and magnetite may be present.
Industry:Mining
A rock consisting almost wholly of serpentine-group minerals, e.g., antigorite and chrysotile or lizardite, derived from the alteration of ferromagnesian silicate minerals, such as olivine and pyroxene. Accessory chlorite, talc, and magnetite may be present.
Industry:Mining
