- 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 ...
In metal mining, a person who operates a power-driven winch on a gold dredge to move it from one working position to another during dredging operations, winding up the cables anchored at points in advance of the dredge.
Industry:Mining
In metal mining, a person who, with a cable drill rig, drills down through gravel to bedrock along a present or an old creek bed that usually has been prospected by a handdug hole. The panner saves the drillings and pans them to discover the possible presence of paydirt (gold-bearing gravel), and weighs gold particles recovered. In the event of the discovery of gold in quantities sufficient for profitable removal, the panner moves drill and continues operations to determine the boundaries of the gold-bearing strata.
Industry:Mining
In metal mining, one who extracts ore located in pockets or other parts not accessible for machine drilling in an open pit mine.
Industry:Mining
In metal mining, one who operates a heavy, mounted, compressed-air, rock-drilling machine in driving drifts (horizontal passages running parallel to the vein opened up to facilitate mining of the ore).
Industry:Mining
In metal mining, one who operates the hoisting engine of a scraper loader, known as a slusher, to load ore into cars or to scrape it into chutes, or to move sand or rock fill in the stopes.
Industry:Mining
In metal mining, one who tends riffles, sluices, and does other work in connection with the hydraulic placer mining of gold. In this type of mining, gold bearing gravel, usually in a bank, is excavated by the erosive action of a high-pressure stream of water being directed at the bank through a nozzle. The gravel is then forced into sluices where the gold particles sink and are caught by riffles (cleats) along the sluice bottom.
Industry:Mining
In metal smelting, the scoria of previous operations, mixed with the ores to retard or prevent fusion of the nonmetallic portions. Also spelled slakin.
Industry:Mining
In metallurgy, a concentration based on the fact that liquid films in laminar flow possess a velocity that is not the same in all depths of the film. There is no flow at the bottom but maximum at or very near the top resulting from the internal friction of one layer upon another. By this principle, lighter particles are washed off while the heavier particles accumulate and are intermittently removed. This is basis of the stationary table, which has been known for thousands of years. Vanners and round tables have been developed from this basic principle, whereas bumping and shaking tables jointly utilize flowing film and other principles.
Industry:Mining
In metallurgy, a heavy suspension method for the concentration of ores in which the waste has a specific gravity of 2.7 or more. Minerals having a specific gravity in excess of 5.25 must be used, since a suspension containing over 40% solids by volume is too plastic for use. Galena (sp gr, 7.4 to 7.6) and ferrosilicon (sp gr, 6.7 to 7.0) have been used.
Industry:Mining
In metallurgy, a laborer who sorts scrap metal and removes foreign matter preparatory to use in recasting.
Industry:Mining
