- 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 ...
The number of near-equal-size diamonds having a total weight of 1 carat or 200 mg; hence, 40 small diamonds weighing 1 carat would be called 40-count diamonds, or 8 diamonds weighing 1 carat would be called 8-count diamonds.
Industry:Mining
The number of ounces of coal dust per cubic foot (or grams per cubic meter) of space, suspended in the air or gases in a specified zone.
Industry:Mining
The number of revolutions a drill stem and bit must turn to advance the drill bit 1 in (2.54 cm) when the stem is attached to and rotated by a screw- or gear-feed-type drill swivel head with a particular pair of the set of gears engaged. (E.g., when a screw-feed swivel head of a diamond drill equipped with three pairs of gears, having a feed ratio of 100, 200, and 400, is operated with the 100-pair engaged, the drill stem must revolve 100 times to advance the bit 1 in, if the 200-pair is engaged, the drill stem rotates 200 times/in (508 times/cm) advanced, and if the 400-pair is engaged the stem must rotate 400 times to advance the bit 1 in).
Industry:Mining
The number of sprocket teeth that engage the chain rollers during one revolution of the sprocket. Applies to sprockets for double-pitch roller chains.
Industry:Mining
The number of that standard pyrometric cone whose tip would touch the supporting plaque simultaneously with a cone of the refractory material being investigated when tested in accordance with ASTM Test Method C-24. Abbrev. PCE.
Industry:Mining
The number that defines, by reference to a series of standard profiles, the size and shape of the residue produced when a standard weight of coal is heated under standard conditions.
Industry:Mining
