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Filter Total Items: 944
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Year Published: 2001

Sulfur and lead isotope geochemistry of hypogene mineralization at the Barite Hill Gold Deposit, Carolina Slate Belt, southeastern United States: A window into and through regional metamorphism

The Barite Hill gold deposit, at the southwestern end of the Carolina slate belt in the southeastern United States, is one of four gold deposits in the region that have a combined yield of 110 metric tons of gold over the past 10 years. At Barite Hill, production has dominantly come from oxidized ores. Sulfur isotope data from...

Seal, Robert R.; Ayuso, Robert A.; Foley, Nora K.; Clark, Sandra H.B.
Sulfur and lead isotope geochemistry of hypogene mineralization at the Barite Hill Gold deposit, Carolina Slate belt, southeastern United States: A window into and through regional metamorphism; 2001; Article; Journal; Mineralium Deposita; Seal, II, R. R.; Ayuso, R. A.; Foley, N. K.; Clark, S. H. B.

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Year Published: 2000

Geochemistry of sulfur in the Florida Everglades; 1994 through 1999

In this report, we present data on the geochemistry of sulfur in sediments and in surface water, groundwater, and rainwater in the Everglades region in south Florida. The results presented here are part of a larger study intended to determine the roles played by the cycling of carbon, nitrogen, phosphorus, and sulfur in the ecology of the south...

Bates, Anne L.; Orem, W.H.; Harvey, J.W.; Spiker, E. C.
Geochemistry of sulfur in the Florida Everglades; 1994 through 1999; 2000; OFR; 2001-7; Bates, Anne L.; Orem, W. H.; Harvey, J. W.; Spiker, E. C.

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Year Published: 2000

Airborne electromagnetics (EM) as a three-dimensional aquifer-mapping tool

The San Pedro River in southeastern Arizona hosts a major migratory bird flyway, and was declared a Riparian Conservation Area by Congress in 1988. Recharge of the adjacent Upper San Pedro Valley aquifer was thought to come primarily from the Huachuca Mountains, but the U. S. Army Garrison of Fort Huachuca and neighboring city of Sierra Vista have...

Wynn, Jeff; Pool, Don; Bultman, Mark; Gettings, Mark; Lemieux, Jean
Airborne electromagnetics (EM) as a three-dimensional aquifer-mapping tool; 2000; Conference publication; Conference publication; Proceedings Volume, SAGEEP-2000 Conference; Wynn, Jeff; Pool, Don; Bultman, Mark; Gettings, Mark; Lemieux, Jean

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Year Published: 2000

Mineral-Resource Databases

Lipin, Bruce R.
Mineral-Resource Databases; 2000; FS; 122-00; Lipin, Bruce R.

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Year Published: 2000

Analytical data for reconnaissance geochemical samples from mine dumps, stream sediments and waters at the Thompson Creek Tungsten Mine, Custer County, Idaho

The Thompson Creek mine is an inactive and abandoned tungsten mine located along Thompson Creek about 10.5 miles (17 km) northwest of Clayton, Idaho (see location map in file LOCATION.PDF). The mine consisted initially of open pit mining of outcrops and later of underground workings accessed by a single adit. The mine was worked through 1955 and...

Van Gosen, B. S.; Eppinger, R.G.; Hammarstrom, J.M.; Briggs, P.H.; Crock, J.G.; Gent, C.; Meier, A.L.; Sutley, S.J.; Theodorakos, P.M.
Analytical data for reconnaissance geochemical samples from mine dumps, stream sediments and waters at the Thompson Creek Tungsten Mine, Custer County, Idaho; 2000; OFR; 2000-239; Van Gosen, B. S.; Eppinger, R. G.; Hammarstrom, J. M.; Briggs, P. H.; Crock, J. G.; Gent, C.; Meier, A. L.; Sutley, S. J.; Theodorakos, P. M.

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Year Published: 2000

Sm-Nd dating of the giant Sullivan Pb-Zn-Ag deposit, British Columbia

We report here Sm and Nd isotope data for hydrothermal tourmalinites and sulfide ores from the giant Sullivan Pb-Zn-Ag deposit, which occurs in the lower part of the Mesoproterozoic Purcell (Belt) Supergroup. Whole-rock samples of quartz-tourmaline tourmalinite from the footwall alteration pipe yield a Sm-Nd isochron age of 1470 ± 59 Ma, recording...

Jiang, Shao-Yong; Slack, John F.; Palmer, Martin R.
Sm-Nd dating of the giant Sullivan Pb-Zn-Ag deposit, British Columbia; 2000; Article; Journal; Geology; Jiang, Shao-Yong; Slack, John F.; Palmer, Martin R.

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Year Published: 2000

U.S. Geological Survey mineral databases; MRDS and MAS/MILS

These two CD-ROM's contain the latest version of the Mineral Resources Data System (MRDS) database and the Minerals Availability System/Minerals Industry Location System (MAS/MILS) database for coverage of North America and the world outside North America. The records in the MRDS database each contain almost 200 data fields describing metallic and...

McFaul, E.J.; Mason, G.T.; Ferguson, W.B.; Lipin, B.R.
U.S. Geological Survey mineral databases; MRDS and MAS/MILS; 2000; DS; 52; McFaul, E. J.; Mason, G. T.; Ferguson, W. B.; Lipin, B. R.

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Year Published: 2000

Hydrologic budget of the late Oligocene Lake Creede and the evolution of the upper Rio Grande drainage system

The filling history, hydrologic budget, and geomorphic development of ancient Lake Creede and its tributary basin are evaluated to determine the factors that controlled its character. The lake filled the Creede caldera that formed in the late Oligocene as a consequence of the eruption of the Snowshoe Mountain Tuff. The caldera's sedimentary fill...

Barton, Paul B.; Steven, Thomas A.; Hayba, Daniel O.
Hydrologic budget of the late Oligocene Lake Creede and the evolution of the upper Rio Grande drainage system; 2000; Article; Journal; GSA Special Papers; Barton, Paul B.; Steven, Thomas A.; Hayba, Daniel O.

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Year Published: 2000

Climatic variability in the eastern United States over the past millennium from Chesapeake Bay sediments

Salinity oscillations caused by multidecadal climatic variability had major impacts on the Chesapeake Bay estuarine ecosystem during the past 1000 yr. Microfossils from sediments dated by radiometry (14C, 137Cs, 210Pb) and pollen stratigraphy indicate that salinity in mesohaline regions oscillated 10-15 ppt during periods of extreme drought (low...

Cronin, Thomas M.; Willard, Debra A.; Karlsen, A.; Ishman, S.; Verardo, S.; McGeehin, John; Kerhin, R.; Holmes, C.; Colman, S.; Zimmerman, A.

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Year Published: 2000

The mountain that moved: geologic wonders of the George Washington and Jefferson National Forests

Prehistoric, giant landslides in Montgomery and Craig Counties, Va., in the Blacksburg/Wythe Ranger Districts of the Jefferson National Forest, are the largest known landslides in eastern North America and are among the largest in the world. One of the landslides is more than 3 miles long! The ancient, giant landslides extend for more than 20...

U.S. Department of the Interior, U.S. Geological Survey, and U.S. Department of Agriculture, Forest Service, Southern Region, 2000, The mountain that moved, no. 2 (Blacksburg/Wythe Ranger Districts) of Geologic wonders of the George Washington and Jefferson National Forests: Reston, Va., U.S. Geological Survey General Interest Publication,

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Year Published: 1999

Lithogeochemical character of the near-surface bedrock in the Connecticut, Housatonic, and Thames River Basins

This data layer shows the generalized lithologic and geochemical (lithogeochemical) character of near-surface bedrock in the Connecticut, Housatonic, and Thames River Basins and several other small basins that drain into Long Island Sound from Connecticut. The area includes most of Connecticut, western Massachusetts, eastern Vermont, western New...

Robinson, Gilpin R.; Peper, John D.; Steeves, Peter A.; Desimone, Leslie A.
Lithogeochemical character of the near-surface bedrock in the Connecticut, Housatonic, and Thames River Basins; 1999; WRI; 99-4000; Robinson, Gilpin R., Jr.; Peper, John D.; Steeves, Peter A.; DeSimone, Leslie A.

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Year Published: 1999

Relation of arsenic, iron, and manganese in ground water to aquifer type, bedrock lithogeochemistry, and land use in the New England coastal basins

In a study of arsenic concentrations in public-supply wells in the New England Coastal Basins, concentrations at or above 0.005 mg/L (milligrams per liter) were detected in more samples of water from wells completed in bedrock (25 percent of all samples) than in water from wells completed in stratified drift (7.5 percent of all samples). Iron and...

Ayotte, Joseph D.; Nielsen, Martha G.; Robinson, Gilpin R.; Moore, Richard B.
Relation of arsenic, iron, and manganese in ground water to aquifer type, bedrock lithogeochemistry, and land use in the New England coastal basins; 1999; WRI; 99-4162; Ayotte, Joseph D.; Nielsen, Martha G.; Robinson, Gilpin R., Jr.; Moore, Richard B.