- 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 simplest, most widely used type of geophone. It consists of a coil and a magnet, one rigidly fixed with respect to the Earth and the other suspended from a fixed support by a spring. Any relative motion between the coil and magnet produces an electromotive force across the coil's terminals that is proportional to the velocity of the motion.
Industry:Mining
The simultaneous control, within prescribed limits, of the quality, quantity, temperature, and humidity of the air in a designated space. It is essentially atmospheric environmental control. Control of only one or two of these properties of the atmosphere does not constitute air conditioning. The definition and correct usage require that the purity, motion, and heat content of the air must all be maintained within the prescribed limits.
Industry:Mining
The simultaneous exchange of material from magma to wall rock and vice versa, tending to develop the same phases in both.
Industry:Mining
The sink-float or dense-media process used for coal cleaning. The separating fluid is a clay-barite water pulp.
Industry:Mining
The sinking of part of the roof of an intrusion within a closed system of peripheral faults into which magma has penetrated, often to form ring dikes.
Industry:Mining
The situation when the cash or spot price of a metal is greater than its forward price. A backwardation occurs when a tight nearby situation exists in a metal. The size of the backwardation is determined by differences between supply and demand factors on the nearby positions compared with the same factors on the forward position. There is no official limit to the backwardation. The backwardation is also referred to as the "back."
Industry:Mining
The situation when the price of a metal for forward or future delivery is greater than the cash or spot price of the metal. Contangos occur when the metal is in plentiful supply. The size of the contango does not normally exceed the cost of financing, insuring, and storing the metal over the future delivery period.
Industry:Mining
The situation when, for a prescribed temperature, pressure, concentration of reactants, and pH, the rate of dissociation of molecules into ions is approx. in balance with that of their recombination.
Industry:Mining
The size analysis of fine-grained sediment made by removing samples from a suspension with a pipette.
Industry:Mining
