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Page 4432, results 110776 - 110800

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Methods for hydrologic monitoring of surface mining in the central-western United States
J.T. Turk, R. S. Parker, R.S. Williams Jr.
1986, Open-File Report 84-600
The regulations promulgated pursuant to the Surface Mining Control and Reclamation Act require the monitoring of potentially impacted hydrologic systems before, during, and after mining operations. This report details characteristics and processes that commonly determine the most acceptable approaches to hydrologic monitoring in the arid and semiarid central-western United States....
Geologic and grade-tonnage information on Tertiary epithermal precious- and base-metal vein districts associated with volcanic rocks
Dan L. Mosier, W. David Menzie, Frank J. Kleinhampl
1986, Bulletin 1666
Data on grades, tonnages, and geology of selected Tertiary epithermal precious- and base-metal vein districts associated with volcanic rocks were tabulated for ease of examination and comparison of characteristics between districts. There are 215 districts listed, with a cumulative tonnage of 709 million metric tons and average grades of...
Median-permeability contour maps of the J sandstone, Dakota Group, in the Denver Basin, Colorado, Nebraska, and Wyoming
D.K. Higley, D. L. Gautier
1986, Miscellaneous Field Studies Map 1837
The Lower Cretaceous J sandstone of the Dakota Group (MacKenzie, 1965) is present in the Denver basin in eastern Colorado, southeastern Wyoming, and southwestern Nebraska. This informally named unit deposited during a regression of the Cretaceous epi continental sea and is composed primarily of sandstone and shale of deItaic and...
Ground-water levels in the alluvial aquifer in eastern Arkansas, 1985
Maria Plafcan
1986, Open-File Report 86-242
This report, prepared by the U.S. Geological Survey in cooperation with the Arkansas Soil and Water Conservation Commission, the U.S. Soil Conservation Service and local Conservation Districts, contains groundwater level measurements in 485 wells tapping the Mississippi River Valley alluvial aquifer of eastern Arkansas. The measurements were made by district...
Principal facts for gravity stations in Paradise and Stagecoach valleys, Humboldt and Lyon counties, Nevada
D. H. Schaefer, B.G. Duffrin, R. W. Plume
1986, Open-File Report 85-694
Principal facts for 178 gravity stations in Paradise Valley and 117 stations in Stagecoach Valley, are tabulated; they consists of latitude, longitude, altitude, observed gravity, free-air anomaly, terrain correction, and Bouguer gravity anomaly values at a bedrock density of 2.67 grams per cubic centimeter. (USGS)...
Trace-element contents of postorogenic granites of the eastern Arabian Shield, Kingdom of Saudi Arabia
J. S. Stuckless, R. B. Vaughn, George VanTrump Jr.
1986, Open-File Report 86-261
Trace-element contents for 46 postorogenic granitoids vary by as much as two orders of magnitude; most samples are strongly enriched in incompatible elements (such as the heavy rare earths, yttrium, niobium, and uranium) and depleted in the compatible elements (such as barium, strontium, scandium, europium, and cobalt). These trace-element characteristics...