Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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A geochemical module for "AMDTreat" to compute caustic quantity, effluent quantity, and sludge volume A geochemical module for "AMDTreat" to compute caustic quantity, effluent quantity, and sludge volume
Treatment with caustic chemicals typically is used to increase pH and decrease concentrations of dissolved aluminum, iron, and/or manganese in largevolume, metal-laden discharges from active coal mines. Generally, aluminum and iron can be removed effectively at near-neutral pH (6 to 8), whereas active manganese removal requires treatment to alkaline pH (~10). The treatment cost depends...
Authors
Charles A. Cravotta, David L. Parkhurst, Brent P Means, Bob McKenzie, Harry Morris, Bill Arthur
Modeling the dynamic geochemistry of prairie pothole wetlands Modeling the dynamic geochemistry of prairie pothole wetlands
No abstract available.
Authors
M.C. Goldhaber, C.T. Mills, Craig A. Stricker, J. W. LaBaugh, D. Mushet, N.H. Euliss
Comparison of turbidity to multi-frequency sideways-looking acoustic-Doppler data and suspended-sediment data in the Colorado River in Grand Canyon Comparison of turbidity to multi-frequency sideways-looking acoustic-Doppler data and suspended-sediment data in the Colorado River in Grand Canyon
Water clarity is important to biologists when studying fish and other fluvial fauna and flora. Turbidity is an indicator of the cloudiness of water, or reduced water clarity, and is commonly measured using nephelometric sensors that record the scattering and absorption of light by particles in the water. Unfortunately, nephelometric sensors only operate over a narrow range of the...
Authors
Nicholas Voichick, David J. Topping
The upper crust on its side---Steeply tilted slabs in the basin and range The upper crust on its side---Steeply tilted slabs in the basin and range
No abstract available.
Authors
Keith A. Howard
Evaluation of the role of magmatic volatiles from Eocene mafic to felsic igneous rocks in the formation of Carlin-type gold deposits of the Carlin trend and Jerritt Canyon District as constrained by preliminary He, Pb, Sr, and Nd isotopic data Evaluation of the role of magmatic volatiles from Eocene mafic to felsic igneous rocks in the formation of Carlin-type gold deposits of the Carlin trend and Jerritt Canyon District as constrained by preliminary He, Pb, Sr, and Nd isotopic data
No abstract available.
Authors
Albert H. Hofstra, Gary P. Landis, Wayne R. Premo, M.W. Ressel, Christopher D. Henry
Paleozoic stratigraphy and kinematics of the Roberts Mountains allochthon in the Independence Mountains, northern Nevada Paleozoic stratigraphy and kinematics of the Roberts Mountains allochthon in the Independence Mountains, northern Nevada
New biostratigraphic, stratigraphic, and structural data from deformed lower Paleozoic sedimentary units of the Roberts Mountains allochthon (RMA), Independence Mountains, Nevada, have enabled the identification of stratigraphic units within the allochthon that range in age from Late Cambrian through Late Devonian. The McAfee thrust fault emplaced a relatively thick (>200 m) sheet of...
Authors
Christopher S. Holm-Denoma, Albert H. Hofstra, Stephen A. Leslie, Paula J. Noble
'Forensic' geochemical approaches to constrain the source of Au-Ag in low-sulfidation epithermal ores 'Forensic' geochemical approaches to constrain the source of Au-Ag in low-sulfidation epithermal ores
In order to better constrain genetic processes involved in forming mineral deposits (and ultimately exploration models), it helps to know from where the metals of interest are derived. How the metals arrived at their point of deposition, and why they were deposited there, are separate issues. We are using three different techniques in an attempt to better understand these processes for...
Authors
James A. Saunders, G. D. Kamenov, Albert H. Hofstra, D. L. Unger, R. A. Creaser, F. Barra
Petrology and hydrothermal alteration of Jurassic intrusive rocks associated with gold deposits in the Bald Mountain mining district, White Pine County, Nevada Petrology and hydrothermal alteration of Jurassic intrusive rocks associated with gold deposits in the Bald Mountain mining district, White Pine County, Nevada
No abstract available.
Authors
Edward A. du Bray, J. Thomas Nash, Gregory P. Meeker, David Adams, William A. Wright
An overview of the Landsat Data Continuity Mission An overview of the Landsat Data Continuity Mission
The Landsat Data Continuity Mission (LDCM) is the follow-on mission to Landsat 7 and will be the eighth mission in the Landsat series. The mission is in development via an interagency partnership between the National Aeronautics and Space Administration (NASA) and the Department of Interior (DOI) / United States Geological Survey (USGS). The LDCM satellite will carry two earth-observing...
Authors
James R Irons, John L. Dwyer
The binding nature of humic substances with arsenic in alluvial aquifers of Chianan Plain, southwestern Taiwan The binding nature of humic substances with arsenic in alluvial aquifers of Chianan Plain, southwestern Taiwan
No abstract available.
Authors
Jiin-Shuh Jean, A. H. M. Selim Reza, Chia-Chuan Liu, Ming-Kuo Lee, Hua-Fen Hsu, Yao-Chang Lee, Thomas R. Kulp
Supply of and demand for selected energy related mineral commodities Supply of and demand for selected energy related mineral commodities
In this report, subjects discussed include components of mineral supply, production, and consumption data, and information on selected mineral commodities in which the Energy Critical Elements Study Group has an interest, and U.S. Geological Survey (USGS) recycling studies, with some results of these studies.
Authors
Scott F. Sibley
Payload-directed control of geophysical magnetic surveys Payload-directed control of geophysical magnetic surveys
No abstract available.
Authors
Ritchie Lee, Yoo-Hsiu Yeh, C. Ippolito, John Spritzer, Geoffrey Phelps