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Page 274, results 6826 - 6850

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Not all publications have extents, not all extents are completely accurate
Technology advancement: A factor in increasing resource use
David R. Wilburn, Thomas G. Goonan, Donald I. Bleiwas
2001, Open-File Report 2001-197
The specter of mineral resource scarcity has been repeatedly raised as a concern because ever-growing populations with seemingly insatiable appetites for minerals place claims against a finite resource endowment. This report analyzes how technology has helped to ease resource constraints, and uses case studies of aluminum, copper, potash, and sulfur...
A simplified economic filter for open-pit mining and heap-leach recovery of copper in the United States
Keith R. Long, Donald A. Singer
2001, Open-File Report 2001-218
Determining the economic viability of mineral deposits of various sizes and grades is a critical task in all phases of mineral supply, from land-use management to mine development. This study evaluates two simple tools for estimating the economic viability of porphyry copper deposits mined by open-pit, heap-leach methods when only...
Sedimentology of the Pennsylvanian and Permian Strathearn Formation, Northern Carlin Trend, Nevada; with a section on microfossil controls on age of the Strathearn Formation
Vladimir I. Berger, Donald A. Singer, Ted G. Theodore, Anita G. Harris, Calvin H. Stevens
2001, Open-File Report 2001-402
Two framework-supported, poorly bedded conglomerate units of the middle Upper Pennsylvanian and middle Lower Permian Strathearn Formation belonging to the overlap assemblage of the Antler orogen are prominent in the northern Carlin trend. These horizons stratigraphically and temporally bracket thrust emplacement of a major allochthonous thrust plate of mainly quartzarenite...
Statistical compilation of NAPAP chemical erosion observations
Victor G. Mossotti, A. Raouf Eldeeb, Michael M. Reddy, Terry L. Fries, Mary Jane Coombs, Ron L. Schmiermund, Susan I. Sherwood
2001, Open-File Report 98-755
In the mid 1980s, the National Acid Precipitation Assessment Program (NAPAP), in cooperation with the National Park Service (NPS) and the U.S. Geological Survey (USGS), initiated a Materials Research Program (MRP) that included a series of field and laboratory studies with the broad objective of providing scientific information on acid...
Core descriptions, core photographs, physical property logs and surface textural data of sediment cores recovered from the continental shelf of the Monterey Bay National Marine Sanctuary during the research cruises M-1-95-MB, P-2-95-MB, and P-1-97-MB
Kevin M. Orzech, Wendy E. Dahl, Brian D. Edwards
2001, Open-File Report 2001-107
In response to the 1992 creation of the Monterey Bay National Marine Sanctuary (MBNMS), the United States Geological Survey (USGS) initiated a multiyear investigation of the Sanctuary continental margin. As part of the investigative effort, this report summarizes the shipboard procedures, subsequent laboratory analyses, and data results from three seafloor...
Digital database of mining-related features at selected historic and active phosphate mines, Bannock, Bear Lake, Bingham, and Caribou counties, Idaho
J. Douglas Causey, Phillip R. Moyle
2001, Open-File Report 2001-142
This report provides a description of data and processes used to produce a spatial database that delineates mining-related features in areas of historic and active phosphate mining in the core of the southeastern Idaho phosphate resource area. The data have varying degrees of accuracy and attribution detail. Classification of areas...
1:100,000-scale topographic contours derived from digital elevation models, San Francisco Bay region, California: a digital database
Heather M. Wright, Carl M. Wentworth
2001, Open-File Report 2001-101
This report presents a consistent set of 1:100,000-scale vector topographic contours for all eleven 30x60-minute quadrangles in the San Francisco Bay region for use in visualizing the topography and preparing maps of the region. The contours were prepared by contouring an areally continuous 30-m altitude grid (National Elevation Dataset, Jan.,...
Paleoliquefaction studies in continental setting; geologic and geotechnical factors in interpretations and back-analysis
Stephen F. Obermeier, Eric C. Pond, Scott M. Olson, Russell A. Green, Timothy D. Stark, James K. Mitchell
2001, Open-File Report 2001-29
Paleoliquefaction research in the last 15 years has greatly improved our ability to interpret the paleoseismic record throughout some large geographic areas, especially in regions of infrequent large earthquakes. Paleoliquefaction studies have been used extensively in the central and eastern U.S. to assess seismic hazards, and could be used elsewhere...
Molluscan fauna from core 25B, Whipray Basin, central Florida Bay, Everglades National Park
Carleigh A. Trappe, G. Lynn Brewster-Wingard
2001, Open-File Report 2001-143
Molluscan assemblages preserved in an 80-cm core from Whipray Basin in central Florida Bay, Everglades National Park, illustrate changes in the environmental conditions within the basin over the last two centuries. Salinity remained polyhaline to euhaline throughout the time of deposition (1800-1997), with alternating periods of stability and increased fluctuations. Since 1800, a Brachidontes...
Concentrations and loads of cadmium, zinc, and lead in the main stem Coeur d'Alene River, Idaho—March, June, September, and October 1999
P. F. Woods
2001, Open-File Report 2001-34
The Remedial Investigation/Feasibility Study conducted by the U.S. Environmental Protection Agency within the Spokane River Basin of northern Idaho and eastern Washington included extensive data-collection activities in numerous studies to determine the nature and extent of trace-element contamination within the basin. The objective of this particular study was to improve...
Surficial geology and distribution of post-impoundment sediment in Las Vegas Bay, Lake Mead
David C. Twichell, VeeAnn A. Cross, Mark J. Rudin, Kenneth F. Parolski, Richard R. Rendigs
2001, Open-File Report 2001-70
Sidescan sonar imagery and seismic-reflection profiles were collected in the northwestern part of Las Vegas Bay to map the distribution and volume of sediment that has accumulated in this part of Lake Mead since impoundment. The mapping suggests that three ephemeral streams are the primary source of this sediment, and...
Fish-community composition in Otselic River, in the vicinity of Whitney Point Lake, Broome and Cortland counties, New York, 2000
R.A. Brightbill, Michael D. Bilger
2001, Open-File Report 2001-78
The U.S. Army Corps of Engineers, Baltimore District, has been conducting biological surveys of the inflow and outflow streams of Whitney Point Lake since the early 1980's. These surveys are made to identify possible detrimental effects as well as benefits of the reservoir and to better understand the aquatic communities...
Geochemical baseline studies and relations between water quality and streamflow in the Upper Blackfoot watershed, Montana: Data for July 1997-December 1998
Sonia A. Nagorski, Johnnie N. Moore, David B. Smith
2001, Open-File Report 2001-59
We used ultraclean sampling techniques to study the solute (operationally defined as <0.2 ?m) surface water geochemistry at five sites along the Upper Blackfoot River and four sites along the Landers Fork, some in more detail and more regularly than others. We collected samples also from Hogum Creek, a tributary to the Blackfoot,...
Volcanism in national parks: summary of the workshop convened by the U.S. Geological Survey and National Park Service, 26-29 September 2000, Redding, California
Steven R. Brantley, Lindsay McClelland
Marianne Guffanti, editor(s)
2001, Open-File Report 2001-435
Spectacular volcanic scenery and features were the inspiration for creating many of our national parks and monuments and continue to enhance the visitor experience today (Table 1). At the same time, several of these parks include active and potentially active volcanoes that could pose serious hazards - earthquakes, mudflows, and...
Seismic images and fault relations of the Santa Monica thrust fault, West Los Angeles, California
R. D. Catchings, G. Gandhok, M. R. Goldman, D. Okaya
2001, Open-File Report 2001-111
In May 1997, the US Geological Survey (USGS) and the University of Southern California (USC) acquired high-resolution seismic reflection and refraction images on the grounds of the Wadsworth Veterans Administration Hospital (WVAH) in the city of Los Angeles (Fig. 1a,b). The objective of the seismic survey was to better understand...
Fish-community composition in Canacadea Creek, in the vicinity of Almond Lake, Allegany and Steuben counties, New York, 2000
R.A. Brightbill, Michael D. Bilger
2001, Open-File Report 2001-79
The U.S. Army Corps of Engineers, Baltimore District, has been conducting biological surveys of the inflow and outflow streams of Almond Lake since the early 1980's. These surveys are made to identify possible detrimental effects as well as benefits of the reservoir and to better understand the aquatic communities in...