- 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 ...
A steeply dipping joint plane in a pluton that is oriented parallel to the lines of flow.
Industry:Mining
A steeply dipping joint plane in a pluton that is oriented parallel to the lines of flow.
Industry:Mining
A steeply dipping joint plane in a pluton that is oriented parallel to the lines of flow.
Industry:Mining
A step cut in which the finished gem is square or rectangular and the rows (steps) of elongated facets on the crown and pavilion are parallel to the girdle with sets on each of the four sides and in some cases at the corners; commonly used on diamonds to emphasize the absence of color and on emeralds and other colored stones to enhance the color. Compare: step cut
Industry:Mining
A stereographic projection representing the statistical average distribution of poles of a specific crystalline plane in a polycrystalline metal, with reference to an external system of axes. In an isotropic metal; i.e., in one having a completely random distribution of orientations, the pole density is stereographically uniform; preferred orientation is shown by an increased density of poles in certain areas.
Industry:Mining
A stereoscope for accurately measuring the three space coordinates of the image of a point on an aerial photography; it is used in making topographic measurements by the comparison of stereoscopic photographs.
Industry:Mining
A stick, tied to the end of a rope, on which workers sit when being raised or lowered in shafts.
Industry:Mining
A stiffener between a stanchion or column and a roof truss, to ensure greater rigidity in a building frame under wind load.
Industry:Mining
