- 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 ...
A steel headgear consisting of two heavy plate A-frames, set astride the shaft mouth. They are braced together and carry the heavy girders that support the winding sheaves platform. It is a completely self-supporting and rigid structure that leaves usable space around the shaft collar and includes a guide-tower structure built over the shaft collar. A number of these headgears have been erected in the Republic of South Africa.
Industry:Mining
A steel or invar tape of a minimum length of 100 ft (30.5 m) used for accurate surveying, graduated in feet.
Industry:Mining
A steel or iron pipe used for transporting the material in hydraulic stowing. Ordinary pipes wear very rapidly owing to the chippings in the water; therefore, they are lined with abrasion-resistant material. This lining gives a very much longer life to the pipe.
Industry:Mining
A steel or timber prop fixed firmly between the roof and the floor at the end of a longwall face and from which a coal cutter is hauled by rope when cutting. A stell prop may also be used as part of a belt-tensioning arrangement or a return sheave.
Industry:Mining
A steel or timber prop fixed firmly between the roof and the floor at the end of a longwall face and from which a coal cutter is hauled by rope when cutting. A stell prop may also be used as part of a belt-tensioning arrangement or a return sheave.
Industry:Mining
A steel pipe lining used in a borehole, particularly when passing through loose, running ground. Flush-jointed casing that is smooth inside and outside may be either screwed or welded.
Industry:Mining
A steel produced by heating blister steel (sheared to short lengths) to a high heat, welding by hammering or rolling, or both, and finally finishing under the hammer at the same or slightly greater heat.
Industry:Mining
A steel produced by the Jupiter process; it is about as strong and as ductile as forged steel.
Industry:Mining
A steel prop in which yield is controlled by friction between two sliding surfaces or telescopic tubes. Although crude when compared with the hydraulic prop, the friction yield prop is very robust, is cheap, and requires little maintenance.
Industry:Mining
A steel reinforcing bar embedded in the concrete and projecting through a construction joint to bind adjoining masses of concrete together.
Industry:Mining
