- 行业: Mining
- Number of terms: 33118
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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 ...
The machinery and equipment used to lower and raise loads through a shaft.
Industry:Mining
The magnetic field spontaneously induced in a volume of rock by the uniform action of an applied field. Its direction and magnitude are parallel and proportional, respectively, to the applied field. In the absence of remanent magnetization, induced magnetization is the magnetic moment per unit volume.
Industry:Mining
The main air splits occur at the shaft bottom. In most cases, these splits are again separated at some point inby and these are called secondary splits.
Industry:Mining
The main development heading from the pit bottom, usually driven along the strike of the coal seam. Because it will carry heavy traffic and large volumes of air, a trunk roadway is at least 14 ft (4.3 m) wide and wide enough for two rail tracks. At intervals, crossheadings are excavated for opening out conveyor panels in the coal seam. Trunk roadways are usually driven in pairs for ventilation, storage space, and access.
Industry:Mining
The main use of this type of bucket elevator has been in handling the product of the larger crushers. Steel buckets of large capacity, which may be as long as 7 ft (2.1 m), are attached rigidly to a heavy flat bar chain, each strand made of two bars with a pitch of 2 and with self-oiling flanged rollers at each intersection. The elevator rises at an angle of about 60 degrees , and the rollers run on ways made of light T-rails. The buckets have overlapping edges, so that there is no spill between them.
Industry:Mining
The major group of ore deposits of magmatic origin, designated as young by European mineralogists, which have been formed under near-surface conditions and very often in Tertiary or younger volcanic rocks. In a strict sense, deposits formed in relation to surface eruptions.
Industry:Mining
