- Industry: 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 ...
On exhaustion of an ore deposit or cessation of an exploitation, the value of its onsite buildings, equipment, stockpiles, untouched remnants of ore concentrates, etc.; in foundations of plant; and any other assets still having value apart from their original use.
Industry:Mining
On mechanized longwall faces, the shift during which coal-cutting, boring, and shotfiring operations are performed.
Industry:Mining
On mechanized longwall faces, the shift during which face conveyors are moved over, and the operations of ripping, packing, and drawing supports from the wastes are performed.
Industry:Mining
On silts where the groundwater contains more than 0.1% of SO<sub>3</sub>, or where a clay soil has more than 0.5% of this substance, the use of lime-free cement in all concrete work is essential to prevent the resulting chemical attack. High-alumina cement gives complete protection, but a sulfate-resisting cement to British Standard 12 may be used where conditions are less severe.
Industry:Mining
On some coal faces, the stone overlying the seam does not always fall in the wastes after withdrawing the supports. To avoid excessive weight on the face, which would cause dangerous roof conditions, it is desirable to blast down the stone in the wastes. Also, in thick seams, the overlying strata requires breaking down to provide sufficient stone for building packs. The holes for waste shots must be drilled from the face side so that the driller is working under a supported roof. Care must be taken to ensure that the holes are not drilled up into the solid strata and that the burden on the shot is not excessive.
Industry:Mining
Once a dust sample has been collected, it must be evaluated. Of principal concern is quantitation--determining how much dust or how many particles. Certain methods of quantitation are favored for the various sampling methods. The number basis is preferable for evaluating a pulmonary hazard, while the weight basis is preferred for toxic, radioactive, or explosive hazards. Number quantitation is usually employed for impinger, konimeter, molecular filter, and thermal precipitator samples. Weight quantitation is used for filter paper and electrostatic samples.
Industry:Mining
One complete breath--an inspiration followed by an expiration, including any pause that may occur between the movements.
Industry:Mining
One comprising hot tops, wood blocks, ingot mold, mold stool, lateral outlet bricks, lateral bricks, king brick, fountain bricks, funnel brick, and suitable metal supporting devices.
Industry:Mining
