- المجال: 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 method of projection which has the advantage of containing a true plan, and can therefore be set up from drawings already in existence for other purposes. The plan is turned through 45 degrees , vertical lines being drawn from the angles on the plan to show the elevations.
Industry:Mining
A method of quarry blasting in which the explosive charges are placed in rows of vertical holes. The loading ratio varies from about 3 st of rock per pound (6 t/kg) of explosive up to about 7 st (14 t/kg) under favorable conditions. Deck loading is usually employed, and a powerful gelatinous explosive is loaded at the bottom of the holes.
Industry:Mining
A method of quarry blasting in which the explosive is confined in small tunnel chambers inside the quarry face. The charges are placed at suitable intervals according to the burden to be blasted. In large blasts, several tunnels and cross tunnels may be employed.
Industry:Mining
A method of quarry blasting in which the explosive is confined in small tunnel chambers inside the quarry face. The charges are placed at suitable intervals according to the burden to be blasted. In large blasts, several tunnels and cross tunnels may be employed.
Industry:Mining
A method of rapid surveying using the tachymeter; e.g., the stadia method of surveying used in United States.
Industry:Mining
A method of reclaiming iron and other metals from the waste materials produced in the smelting of zinc and lead ores. The process differs from the Krupp-Renn method in that it is a volatilization process for recovering molten metals in oxide form. The metal vapors are oxidized by excess air and carried off in the flue gases from which they are subsequently filtered.
Industry:Mining
A method of recovering flue dust and also sublimed lead, whereby furnace gases and fumes are passed through bags suspended in a baghouse. The furnace gases thus are filtered, and the particles in suspension collected.
Industry:Mining
A method of reducing iron ores in which an electric furnace is fitted with two or more hollow electrodes, through which the finely divided ore, intimately mixed with reducing materials, is introduced.
Industry:Mining
