- 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 narrow roadway driven in a coal seam parallel and close to a winning headway chiefly for ventilation; it usually acts as a return and is connected at intervals of 10 yd (9 m) or so to the headway by crosscuts.
Industry:Mining
A narrow, flat, rock-floored tongue extending upslope from the main pediment and penetrating a mountain sufficiently to meet another pediment slope extending into the mountain from the other side.
Industry:Mining
A narrowing of two single railway tracks almost into the space of one, as on a bridge or in a tunnel, without breaking the continuity of either track by a switch, the two tracks overlapping each other.
Industry:Mining
A native alloy of argentiferous gold with palladium, the palladium content varying up to 10%. From Porpez, Brazil.
Industry:Mining
A native alloy of argentiferous gold with palladium, the palladium content varying up to 10%. From Porpez, Brazil.
Industry:Mining
A native compound of arsenic and antimony of which the antimony forms a comparatively small part. Compare: allemontite
Industry:Mining
A native ferrous carbonite, also called siderite, containing 48% iron and usually traces of manganese. It is the best native ore for making steel tools by the direct method formerly used.
Industry:Mining
