- 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 ...
In Great Britain, every shot firer is provided with a scraper for cleaning out shotholes, and in safety lamp mines a break detector must also be provided. The two tools are combined in the scraper and break detector. It can clean out a shothole and detect breaks in the walls of 1/8 in (3 mm) or more in width. The firing of a shot in a hole traversed by a crack exceeding 1/8 in in width is forbidden.
Industry:Mining
In Great Britain, tests of every type of apparatus are made in explosive atmospheres before it is approved and allowed to use the official letters F.L.P. (flameproof).
Industry:Mining
In Great Britain, the arbitrary standards laid down by the National Coal Board in 1949 as representing comparative dust-free conditions in coal mines. These are as follows: stone dust, 450 particles/cm<sub>3</sub>(size range, 0.5 to 5.0 mu m); anthracite, 650 particles/cm<sub>3</sub>(size range, 1 to 5 mu m); and coal, 850 particles/cm<sub>3</sub>(size range, 1 to 5 mu m).
Industry:Mining
In high-intensity electrical fields, discharge from sharp points along a conductor. Electricity concentrates at these points and charges ambient molecules of air, which are then repelled, carrying away charge. The phenomenon is exploited in mineral processing in high-tension separation.
Industry:Mining
In ground water hydrology, a field technique for estimating transport parameters by injecting a tracer (e.g., dye, radioactive substance, or chemical not naturally present in the flow system) and monitoring the time and concentrations at a downgradient location.
Industry:Mining
In Great Britain, under the regulations made by the Minister (Smoke Control Areas- Authorized Fuels-Regulations, 1956), authorized fuels include coke of all kinds, anthracite, low-volatile steam coals, Phurnacite, Coalite, Rexco, etc., as well as oil, gas, and electricity.
Industry:Mining
In hydraulic mining, driving the gravel forward with the stream from the giant. Opposite of drawing.
Industry:Mining
In hydraulics, the condition of a river with respect to the rate of its flow as measured by the volume of water passing different cross sections in a given time.
Industry:Mining
In igneous rock, a joint dipping at an angle of 45 degrees or less. Rarely applied to joints dipping more than 20 degrees .
Industry:Mining
In inclined shaft timbering, a joint in which the end pieces are checked into the cap and sill for a distance of approx. 1 in (2.5 cm), with a bevel on the inner side.
Industry:Mining
