- 行业: 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 ...
Map upon which is shown a portion of land having elevations indicated by a series of separate lines, each of which passes through a specified elevation; the sinuosity and spacing or crowding together of the contour lines, as they are called, indicate slope and relief of the terrain.
Industry:Mining
Mapping the force of gravity at different places with a gravimeter (gravity meter) to determine differences in specific gravity of rock masses, and, through this, the distribution of masses of different specific gravity.
Industry:Mining
Marine deposit of mud formed under anoxic conditions and containing anomalously high quantities of zinc, silver, and copper, and lesser amounts of lead and gold. The term has most often been applied to deposits of muds in the Red Sea which have been formed by submarine precipitation of metallic sulfides from hydrothermal vents. These vents occur along the axis of a spreading center which forms the Red Sea Basin.
Industry:Mining
Marine deposits formed around coral islands and coasts bordered by coral reefs, containing abundant fragments of corals. Near the reefs the particle sizes are relatively coarse and the deposit is described as coral sand; farther out, the particles become gradually smaller until the material is a coral mud.
Industry:Mining
Marking the ground surface by pegs at points where proposed new slopes in cut or fill coincide with the orginal surface.
Industry:Mining
Masonry in which the face of the stone is left unfinished just as it comes from the quarry.
Industry:Mining
Massive copper made from ground, brittle, cathode copper by briquetting and sintering in a reducing atmosphere at high temperatures with pressure.
Industry:Mining
