United States Geological Survey YearbookThe Survey, 1987 - Geology |
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Page 57
... coal available for mining . This estimate was determined by applying bed thickness , mining depth , and reliability factors to a geologically derived coal- resource base . However , this methodology for calculating " available " coal ...
... coal available for mining . This estimate was determined by applying bed thickness , mining depth , and reliability factors to a geologically derived coal- resource base . However , this methodology for calculating " available " coal ...
Page 58
... coal , none have used a comprehensive geologic data base and considered all of the restrictions now placed on coal mining . A new methodology is necessary to determine coal actually available for min- ing . This methodology must be ...
... coal , none have used a comprehensive geologic data base and considered all of the restrictions now placed on coal mining . A new methodology is necessary to determine coal actually available for min- ing . This methodology must be ...
Page 59
... coal econ- omy are relatively uniform . Coals are found in a variety of geologic settings , and it will therefore be necessary that similar studies be done in the other major coal - producing areas where coal characteristics differ sig ...
... coal econ- omy are relatively uniform . Coals are found in a variety of geologic settings , and it will therefore be necessary that similar studies be done in the other major coal - producing areas where coal characteristics differ sig ...
Page 60
... Upper Elkhorn No. 2 coal seam ( colored area ) , Matewan quadrangle , Kentucky , before mining . WEST VIRGINIA WEST VIRGINIA Surface Mineable Underground Mineable Figure 4B . Areas. 60 U.S. Geological Survey Yearbook 1987.
... Upper Elkhorn No. 2 coal seam ( colored area ) , Matewan quadrangle , Kentucky , before mining . WEST VIRGINIA WEST VIRGINIA Surface Mineable Underground Mineable Figure 4B . Areas. 60 U.S. Geological Survey Yearbook 1987.
Page 61
... 4B . Areas where the Up- per Elkhorn No. 2 coal seam is available for surface or under- ground mining , after applying restrictions . Figure 5. Status of the GLORIA mapping program and location. Geologic Investigations 61.
... 4B . Areas where the Up- per Elkhorn No. 2 coal seam is available for surface or under- ground mining , after applying restrictions . Figure 5. Status of the GLORIA mapping program and location. Geologic Investigations 61.
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activities Administration agencies Alaska aquifer basin Bureau Calcasieu River cartographic CD ROM Chief City City of w coal color Commission concentrations Connecticut contamination cooperative Coordination County crater data base Department of Public deposits drilling Earth Science earthquakes energy Enewetak Environmental facilities Federal feet Figure fiscal year 1987 geographic information systems geologic map Geologist geophysical gram graphic ground water hazards hydrologic Hydrologist investigations Lake Nyos land located lower Calcasieu River major Management ment miles million mineral resources mining models National Center National Mapping Division Office organic compounds Park percent Planning processes production projects Province quadrangle Regional Reston rocks samples San Andreas fault San Joaquin River scientific scientists sedimentary sediments seismic selenium Service South Stop studies surface Survey's techniques tion topographic Transportation U.S. Geological Survey United users USGS Vernalis Volcano Water District Water Resources water-use zone