- 行业: Mining
- Number of terms: 33118
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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 curve obtained from the float-and-sink analysis by plotting the ash contents of successive fractions against specific gravity.
Industry:Mining
The curve obtained from the result of a float and sink analysis by plotting the cumulative yield at each specific gravity against the mean ash of the total floats at that specific gravity.
Industry:Mining
The curve obtained from the results of a float and sink analysis by plotting the cumulative yield of sinks at each specific gravity against the mean ash of the total sinks at that specific gravity.
Industry:Mining
The curve obtained from the results of a float-and-sink analysis showing, for any yield of floats (sinks), the ash content of the highest density (lowest density) fraction passing into these floats (sinks), the yield being plotted on the ordinate and the ash content on the abscissa.
Industry:Mining
The customary unit of measurement of permeability, equal to one-thousandth of a darcy.
Industry:Mining
The cut point (equal errors or partition size) at which a screening process operates in dividing the material treated into two size fractions.
Industry:Mining
The cutting bit in diamond drilling. It consists of a steel shell containing small cavities in its face and edges into which black diamonds are set. In some types of crown the diamonds can be removed and reset for further use. Grooves, called waterways, are usually provided in the face of the crown to allow the passage of the drilling fluid. For surface-set bits in diamond drilling, it is recommended that 2 to 20 stones per carat should be used in soft ground (such as shale); 10 to 80 stones per carat in medium ground (such as sandstone); and 20 to 150 stones per carat in hard ground (such as granite).
Industry:Mining
The cutting device at the lower end of cable drilling tools or rotary drill pipe, the function of which is to accomplish the actual boring or cutting.
Industry:Mining
The cutting of pieces of ore and rock from exposed faces of ore and waste. The faces may be natural outcrops or faces exposed in surface trenches and pits. Face samples may be taken by cutting grooves or channels of uniform width and depth across the face or sections of the face or by picking off small pieces all over the face, more or less at random.
Industry:Mining
The cutting tool at the end of the drill steel. Various bit shapes are used, the three commonest being the single chisel bit (used only for hand drills); the double chisel bit (used for fairly soft rock), and the cross bit (used for hard rock and for general purposes).
Industry:Mining
