- 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 ...
An apple-green silicate mineral belonging to the phyllosilicate group and occurring in foliated hexagonal plates.
Industry:Mining
An appliance fixed in the headgear to limit the drop of a cage after an overwind. The upward speed and momentum of the loaded cage (after its release from the rope) may be such that its subsequent drop is so severe as to fracture the suspension gear, resulting in the cage falling down the shaft. The amount of drop is limited by the catch gear, which consists of a series of catches suspended from beams supported on hydropneumatic buffers to reduce the impact shock. The cage is released by raising it slightly and retracting the catches.
Industry:Mining
An appliance for approx. sizing crushed minerals or ores by means of currents of air.
Industry:Mining
An appliance for attaching and detaching mine trams or cars without manual effort. It is generally attached at inby clipping stations and detached at the shaft bottom.
Industry:Mining
An appliance for controlling mine cars at loading points, for marshalling trains, and for loading cars into cages, tipplers, and other points. It consists of a carrying chain running between the rails. The dummy or live axles of the cars are held firmly by the chain's profile, and an overload slipping action is provided.
Industry:Mining
An appliance for cutting metals by means of a flame obtained from acetylene and compressed oxygen, which are stored in separate steel cylinders. Oxyhydrogen and oxycoal gas flames are also used.
Industry:Mining
An appliance for handling broken rock in flat mine stopes. A sheet-steel trough is hung from chains and arrested at one end of its swing by a bump stop, so that the ore slides forward.
Industry:Mining
An appliance for holding stones or other heavy objects that are to be hoisted by crane. It consists of a pair of bars hinged together like scissors, the points of which are bent inwards for gripping the load, while the handles are connected by short lengths of chain to a common hoist ring.
Industry:Mining
An appliance for loosening coal by means of high-pressure water and oil. It consists of a round, stainless steel bar with small telescopic rams acting on a steel liner in a shot hole. The bar is connected to a hand- or power-operated pump placed near the face. The highpressure liquid from the pump causes the rams and liner to exert a pressure sufficient to loosen or break down the coal. It is a safe method of coal breaking without the use of explosives. It has not, however, made the progress originally anticipated.
Industry:Mining
