- 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 contour line shown on a map in a distinctive manner for ease of identification, being printed more heavily than other contour lines and generally labeled with a value (such as figure of elevation) along its course. It appears at regular intervals, such as every fifth or sometimes every fourth contour line (depending on the contour interval).
Industry:Mining
A contour line shown on a map in a distinctive manner for ease of identification, being printed more heavily than other contour lines and generally labeled with a value (such as figure of elevation) along its course. It appears at regular intervals, such as every fifth or sometimes every fourth contour line (depending on the contour interval).
Industry:Mining
A contour line that forms a closed loop and does not intersect the edge of the map area on which it is drawn; e.g., a depression contour indicating a closed depression, or a normal contour indicating a hilltop.
Industry:Mining
A contour map that depicts the continuity and extent of color stains on geologic formations.
Industry:Mining
A contour ridge, built of soil moved from its uphill side, that serves to divert surface water from a field.
Industry:Mining
A contour that portrays a structural surface such as a formation boundary or a fault.
Industry:Mining
A contour that portrays a structural surface such as a formation boundary or a fault.
Industry:Mining
A contracted form of the names leucite and nephelite; suggested as an alternative group name for the feldspathoid minerals. Compare: feldspathoid.
Industry:Mining
A contraction in a tube or duct to accelerate the flow and lower the static pressure. It is used for metering and other purposes.
Industry:Mining
