- 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 mine subsidence theory that is a variant or extension of the vertical theory. In this theory, allowance is made for movements beyond the undermined area, but the dip of the beds is considered to be of little or no influence. Rziha maintained that if rock is 2729 undercut, it will stay undisturbed if cohesion exceeds gravity and will fall if gravity exceeds cohesion. S
Industry:Mining
A mine support frame used esp. in inclined shafts where protection from rock pressure is needed on all sides. This completely closed set is provided at the bottom with a sill. The joint is usually effected by tenons, so that when the pressure is exerted in a downward direction the timbers interlock.
Industry:Mining
A mine that has not obtained the necessary permits and licenses from the appropriate State and Federal agencies before commencement of mining.
Industry:Mining
A mine ventilation system in which the air is led through a shaft in the middle of the field into the mine and out again at the periphery of the mining field.
Industry:Mining
A mine ventilation system in which the fresh intake air flows down to the bottom end of the workings and then ascends along the faces to the main return.
Industry:Mining
A mine ventilation system in which the upcast shaft for taking air out of a mine is situated at the limits of the mining field or away from the downcast shaft.
Industry:Mining
A mine ventilation system in which the upcast shaft for taking air out of a mine is situated at the limits of the mining field or away from the downcast shaft.
Industry:Mining
A mine ventilation system in which the upcast shaft for taking air out of a mine is situated at the limits of the mining field or away from the downcast shaft.
Industry:Mining
A mine waste management practice whereby mill tailings or mine waste rock are emplaced under a body of water to minimize sulfide oxidation and acid formation, and eliminate airborne particulate pollution. If a natural sedimentation basin is utilized, erosion hazards inherent to subaerial impoundments are eliminated.
Industry:Mining
