United States Geological Survey YearbookThe Survey, 1987 - Geology |
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Page 14
... mined from surficial geologic maps and hydrogeologic maps . Adjacent till and bed- rock areas that are not drained by peren- nial streams also contribute recharge , 2 1 2 2 1 1 1 1 either from subsurface inflow or from infil- tration of ...
... mined from surficial geologic maps and hydrogeologic maps . Adjacent till and bed- rock areas that are not drained by peren- nial streams also contribute recharge , 2 1 2 2 1 1 1 1 either from subsurface inflow or from infil- tration of ...
Page 25
... mining districts , including the Upper Mississippi Valley lead - zinc district , the Illinois - Kentucky fluorspar ... mines may be mineral resources of compa- rable value . The complex Precambrian rocks ( more than 570 million years old ) ...
... mining districts , including the Upper Mississippi Valley lead - zinc district , the Illinois - Kentucky fluorspar ... mines may be mineral resources of compa- rable value . The complex Precambrian rocks ( more than 570 million years old ) ...
Page 27
... mining indus- tries gathered at a workshop on the geol- ogy of the early Mesozoic ( 180-230 million years ( m.y. ) old ) basins of eastern North America , held at the USGS National Cen- ter during May 1987. The workshop was designed as ...
... mining indus- tries gathered at a workshop on the geol- ogy of the early Mesozoic ( 180-230 million years ( m.y. ) old ) basins of eastern North America , held at the USGS National Cen- ter during May 1987. The workshop was designed as ...
Page 28
... mined by the Stillwater Mining Company , a joint venture of Chevron Corporation , Lac Min- erals Limited , and Manville Corporation ( fig . 4 ) . The J - M Reef was discovered in 1973 and has been extensively explored since then . This ...
... mined by the Stillwater Mining Company , a joint venture of Chevron Corporation , Lac Min- erals Limited , and Manville Corporation ( fig . 4 ) . The J - M Reef was discovered in 1973 and has been extensively explored since then . This ...
Page 29
... mined occur at the part per billion to part per million level . Preliminary eval- uation of a limited data set indicates corre- lations between the trace elements and platinum - group elements . In addition to providing the data ...
... mined occur at the part per billion to part per million level . Preliminary eval- uation of a limited data set indicates corre- lations between the trace elements and platinum - group elements . In addition to providing the data ...
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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