Eric D. Anderson, Ph.D.

Science and Products

• Science
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  September 13, 2023

  Porphyry Copper Systems of the Boulder batholith, Montana

  The project seeks to better understand the mineral systems of the Boulder batholith and surrounding region in Montana using new airborne geophysical data in conjunction with geologic mapping.

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

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  September 13, 2023

  Porphyry Copper Systems of the Boulder batholith, Montana

  The project seeks to better understand the mineral systems of the Boulder batholith and surrounding region in Montana using new airborne geophysical data in conjunction with geologic mapping.

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  September 30, 2022

  A Shallow to Deep View Inside the Hydrothermally Altered and Mineralized Silverton Caldera Complex: New Geologic Insights Gained From Modern Geophysical Interpretations

  The Silverton caldera complex in southwest Colorado hosts base and precious metals that have been mined since the late 1800s. Extensive mine workings, excellent bedrock exposures, and deeply incised drainages make this area a natural laboratory ideally suited for furthering our understanding of the mineral systems in a volcanic environment. In addition, state-of-the-art geophysical data processing...

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

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  September 30, 2022

  A Shallow to Deep View Inside the Hydrothermally Altered and Mineralized Silverton Caldera Complex: New Geologic Insights Gained From Modern Geophysical Interpretations

  The Silverton caldera complex in southwest Colorado hosts base and precious metals that have been mined since the late 1800s. Extensive mine workings, excellent bedrock exposures, and deeply incised drainages make this area a natural laboratory ideally suited for furthering our understanding of the mineral systems in a volcanic environment. In addition, state-of-the-art geophysical data processing...

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  September 30, 2015

  National Geophysical Data Retrieval and Integration Project

  This project helped to streamline the workflow from geophysical data acquisition to data distribution, and additionally provided user support for integration and interpretation of these complex data sets. There were four main objectives: 1) contracting geophysical surveys, 2) converting data from analog to digital format, 3) archiving, retrieving, and integrating geophysical data, and 4) outreach.

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

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  September 30, 2015

  National Geophysical Data Retrieval and Integration Project

  This project helped to streamline the workflow from geophysical data acquisition to data distribution, and additionally provided user support for integration and interpretation of these complex data sets. There were four main objectives: 1) contracting geophysical surveys, 2) converting data from analog to digital format, 3) archiving, retrieving, and integrating geophysical data, and 4) outreach.

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• Data
  Filter Total Items: 14

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  TypeData ReleaseReal-time Data

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  Year20232022202120202019201820172016201520142013201220112010200920082007200620052004200320022001200019991998199719961995

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  March 1, 2023

  Airborne magnetic and radiometric survey of the Wet Mountains and surrounding region, Custer and Fremont Counties, south-central Colorado, 2021

  This data release provides digital flight-line and gridded data for a high-resolution airborne magnetic and radiometric survey over the region surrounding the Wet Mountains of southern Colorado, including parts of Custer and Fremont Counties. Data for this survey were collected by Sander Geophysics Limited International (SGL) under contract with the USGS. The survey was flown in June and July of 2

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

  January 12, 2023

  Airborne electromagnetic and magnetic survey data, Silverton, Colorado, 2019

  Airborne electromagnetic (AEM) and magnetic survey data were collected during April and May 2019 along 1,467 line-kilometers in the San Juan-Silverton Caldera complex, Colorado, in the Southern Rocky Mountain Volcanic Field. Data were acquired by Geotech, Ltd. with the versatile time-domain electromagnetic (VTEM-ET) system together with a Geometrics optically pumped cesium vapor magnetometer. The

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

  January 6, 2023

  Gravity data in the Wet Mountains area, southcentral Colorado, 2021 to 2022

  The U.S. Geological Survey (USGS) collected gravity data in the Wet Mountains, CO from September 2021 to July 2022 to compliment newly collected airborne magnetic data for surface and subsurface geologic mapping. A total of 261 measurements were collected across two Ediacaran-Ordovician alkaline complexes (Gem Park and McClure Mountain) and gabbroic outcrops suspected Ediacaran-Ordovician in age.

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

  January 6, 2023

  Magnetic susceptibility measurements in the Wet Mountains, Colorado, 2021 to 2022

  The U.S. Geological Survey (USGS) collected rock magnetic susceptibility measurements to understand the causative sources of airborne magnetic survey anomalies in the Wet Mountains, Colorado. A total of 808 measurements were collected over 50 locations from August 2021 to June 2022 on rocks ranging from Paleoproterozoic to Oligocene age. These measurements aid the interpretation of newly collected

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

  July 29, 2022

  Magnetic susceptibility measurements on hydrothermally altered rocks in the Silverton caldera, southwest Colorado

  The U.S. Geological Survey (USGS) collected magnetic susceptibility measurements on rock outcrops to help understand causative sources of magnetic survey anomalies in the Silverton caldera region, southwest Colorado. A total of 1,400 measurements of magnetic susceptibility from 87 locations have been conducted on Paleogene volcanic and plutonic rocks that have been hydrothermally altered. Magnetic

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

  December 9, 2021

  Airborne Geophysical Survey Inventory of the Conterminous United States, Alaska, Hawaii, and Puerto Rico (ver. 4.0, April 2023)

  This data release is a compilation of the locations of airborne geophysical surveys in the United States. The inventory documents public airborne geophysical surveys primarily flown by or contracted by the USGS from 1943 to present. In addition, surveys from the State of Alaska, Department of Natural Resources, Division of Geological and Geophysical Surveys (DGGS): Airborne GeophysWeb, the Bureau

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

  August 27, 2021

  A snapshot of stakeholder science needs related to drought in the Colorado River Basin

  Stakeholder science needs were determined by reviewing more than 200 recently published literature items and web pages from Colorado River Basin (CRB) stakeholders. These stakeholder communications were used to characterize over 400 stakeholder science needs by reviewing their priorities, strategies, issues, missions, and concerns related to drought in the CRB. Members of the CRB Integrated Scienc

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  Arizona Water Science Center, California Water Science Center, Colorado Water Science Center, Fort Collins Science Center, Geology, Geophysics, and Geochemistry Science Center, Nevada Water Science Center, New Mexico Water Science Center, Southwest Biological Science Center, Utah Water Science Center, Wyoming-Montana Water Science Center, Colorado River Basin: Actionable and Strategic Integrated Science and Technology

  June 24, 2021

  Data and results for GIS-based identification of areas that have resource potential for lode gold deposits in Alaska

  This data release contains the analytical results and evaluated source data files of geospatial analyses for identifying areas in Alaska that may be prospective for different types of lode gold deposits, including orogenic, reduced-intrusion-related, epithermal, and gold-bearing porphyry. The spatial analysis is based on queries of statewide source datasets of aeromagnetic surveys, Alaska Geochemi

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  Alaska Science Center

  September 23, 2020

  Principal facts of regional gravity data in the central Upper Peninsula, Michigan, and northeastern Wisconsin

  Gravity data were collected from 2016 through 2019 to assist in mapping surface and subsurface geology in the central Upper Peninsula of Michigan and in neighboring northeastern Wisconsin. This data release provides principal facts for 1536 new gravity stations that were acquired to supplement existing public gravity data coverage.

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

  September 2, 2020

  Airborne electromagnetic and magnetic survey data of the San Juan-Silverton Caldera complex, Silverton, Colorado, 2019

  Airborne electromagnetic (AEM) and magnetic survey data were collected during April and May 2019 along 1,467 line-kilometers in the San Juan-Silverton Caldera complex, Colorado, in the Southern Rocky Mountain Volcanic Field. Data were acquired by Geotech, Ltd. with the versatile time-domain electromagnetic (VTEM) system together with a Geometrics optically pumped cesium vapor magnetometer. The sur

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

  August 6, 2020

  Density and magnetic susceptibility measurements on Precambrian rocks in the Iron Mountain-Menominee region, Michigan-Wisconsin

  The U.S. Geological Survey (USGS) collected rock physical property measurements to help understand causative sources of gravity and magnetic survey anomalies in the Iron Mountain-Menominee region, Michigan-Wisconsin. A total of 2,356 measurements of magnetic susceptibility and density from 152 locations have been conducted on Precambrian rocks. The measurements aid in interpretation of newly acqui

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  Geology, Geophysics, and Geochemistry Science Center

  December 20, 2018

  Updated aeromagnetic and gravity anomaly compilations and elevation-bathymetry models over Lake Superior

  New gravity and magnetic compilations and elevation-bathymetry models have been compiled for the Lake Superior region. These data provide continuous sets of observations for geologic interpretations spanning political boundaries such as US States and the US-Canada border where bedrock geology is largely concealed beneath glacial deposits and surface water. These data are providing constraints for

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
• Maps
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  September 26, 2011

  Geologic map of Big Bend National Park, Texas

  The purpose of this map is to provide the National Park Service and the public with an updated digital geologic map of Big Bend National Park (BBNP). The geologic map report of Maxwell and others (1967) provides a fully comprehensive account of the important volcanic, structural, geomorphological, and paleontological features that define BBNP. However, the map is on a geographically distorted plan

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  Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center

  July 12, 2008

  Precambrian basement structure map of the continental United States - An interpretation of geologic and aeromagnetic data

  The Precambrian basement rocks of the continental United States are largely covered by younger sedimentary and volcanic rocks, and the availability of updated aeromagnetic data (NAMAG, 2002) provides a means to infer major regional basement structures and tie together the scattered, but locally abundant, geologic information. Precambrian basement structures in the continental United States have

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  Geology, Geophysics, and Geochemistry Science Center
• Publications
  Filter Total Items: 51

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  TypeArticleBookBook ChapterConference PaperNewsletterOtherReportThesis

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  Year20232022202120202019201820172016201520142013201220112010200920082007200620052004200320022001200019991998199719961995

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  September 12, 2023

  Colorado River Basin Actionable and Strategic Integrated Science and Technology (ASIST) pilot project progress toward an information management and technology plan

  Executive SummaryThe U.S. Geological Survey carries out a wide variety of multidisciplinary science projects through the Bureau’s regions, mission areas, programs, and science centers. However, this structure can limit interactions among individual scientists, segregate data holdings, and make it difficult to apply holistic, interdisciplinary science. In addition, technological advances in sensors

  Authors

  Eric D. Anderson, Jennifer R. Erxleben, Sharon L. Qi, Adrian P. Monroe, Katharine G. Dahm

  March 30, 2023

  Ediacaran-Ordovician magmatism and REE mineralization in the Wet Mountains, Colorado, USA: Implications for failed continental rifting

  Structures associated with Ediacaran-Ordovician alkaline magmatism and the timing of rare earth element (REE) mineralization in the Wet Mountains, CO, were analyzed using field, geophysical, and U-Th-Pb isotope methods to interpret their tectonic setting in the context of previously proposed rift models. The Wet Mountains are known for thorium and REE mineralization associated with failed rift-rel

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  Benjamin Patrick Magnin, Yvette Kuiper, Eric D. Anderson

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

  January 30, 2023

  Colorado River Basin Actionable and Strategic Integrated Science and Technology Project—Science strategy

  The U.S. Geological Survey (USGS) conducts a wide variety of science that improves understanding of droughts and their effects on ecosystems and society. This work includes data collection and monitoring of aquatic and terrestrial systems; assessment and analysis of patterns, trends, drivers, and impacts of drought; development and application of predictive models; and delivery of information and

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  Katharine G. Dahm, Todd Hawbaker, Rebecca J. Frus, Adrian P. Monroe, John B. Bradford, William J. Andrews, Alicia Torregrosa, Eric D. Anderson, David Dean, Sharon L. Qi

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  Geosciences and Environmental Change Science Center, Colorado River Basin: Actionable and Strategic Integrated Science and Technology

  November 29, 2022

  U.S. Geological Survey Colorado River Basin Actionable and Strategic Integrated Science and Technology (ASIST)—Information Management Technology Plan

  IntroductionMore than 840 publications, 575 data releases, and 330 project web pages from the U.S. Geological Survey (USGS) pertain to the Colorado River Basin. Limited interconnections between Colorado River Basin publications, data, and web pages restrict the ability to synthesize and interpret scientific resources. Currently, these pieces are spread across multiple isolated locations, internal

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  Eric D. Anderson, Jennifer R. Erxleben, Sharon L. Qi, Adrian P. Monroe, Katharine G. Dahm

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  Ecosystems Mission Area, Water Resources Mission Area, Fort Collins Science Center, Oregon Water Science Center, Colorado River Basin: Actionable and Strategic Integrated Science and Technology

  November 22, 2022

  Geophysical data provide three dimensional insights into porphyry copper systems in the Silverton caldera, Colorado, USA

  The Silverton caldera in southwest Colorado, USA hosts polymetallic veins and pervasively altered rocks indicative of porphyry copper systems. Nearly a kilometer of erosion has exposed multiple levels of the hydrothermal systems from shallow lithocaps down to quartz-sericite-pyrite veins. New airborne electromagnetic and magnetic survey data are integrated with previous alteration mapping and porp

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  Eric D. Anderson, Douglas Yager, Maria Deszcz-Pan, Bennett Eugene Hoogenboom, Brian D. Rodriguez, Bruce Smith

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

  June 29, 2021

  GIS-based identification of areas that have resource potential for lode gold in Alaska

  Several comprehensive, data-driven geographic information system (GIS) analyses were conducted to assess prospectivity for lode gold in Alaska. These analyses use available geospatial datasets of lithologic, geochemical, mineral occurrence, and geophysical data to build models for recognizing different types of gold deposits within physiographic units defined by stream drainage basins that are app

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  Susan M. Karl, Douglas C. Kreiner, George N. D. Case, Keith A. Labay, Nora B. Shew, Matthew Granitto, Bronwen Wang, Eric D. Anderson

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  Ecosystems Mission Area, Energy and Minerals Mission Area, Mineral Resources Program, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center

  February 25, 2021

  Analytical validation of two RT-qPCR tests and detection of spring viremia of carp virus (SVCV) in persistently infected koi Cyprinus carpio

  Spring viremia of carp virus (SVCV) ia a carp sprivivirus and a member of the genus Sprivivirus within the family Rhabdoviridae. The virus is the etiological agent of spring viremia of carp, a disease of cyprinid species including koi Cyprinus carpio L. and notifiable to the World Organisation for Animal Health. The goal of this study was to explore hypotheses regarding inter-genogroup (Ia to Id)

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  Sharon C Clouthier, Tamara Schroeder, Emma K Bueren, Eric D. Anderson, Eveline Emmenegger

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  Ecosystems Mission Area, Biological Threats and Invasive Species Research Program, Species Management Research Program, Western Fisheries Research Center, Fish Health Program (FHP)

  November 10, 2020

  Alkalic-type epithermal gold deposit model; Chapter R in Mineral deposit models for resource assessment

  This report summarizes the primary characteristics of alkalic-type epithermal gold (Au) deposits and provides an updated descriptive model. These deposits, primarily of Mesozoic to Neogene age, are among the largest epithermal gold deposits in the world. Considered a subset of low-sulfidation epithermal deposits, they are spatially and genetically linked to small stocks or clusters of intrusions c

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  Karen D. Kelley, Paul G. Spry, Virginia T. McLemore, David L. Fey, Eric D. Anderson

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  Geology, Geophysics, and Geochemistry Science Center

  October 26, 2020

  Integrated geophysical analysis provides an alternate interpretation of the northern margin of the North American Midcontinent Rift System, Central Lake Superior

  The Midcontinent Rift System (MRS) is a 1.1 Ga sequence of voluminous basaltic eruptions and multiple intrusions followed by widespread sedimentation that extends across the Midcontinent and northern Great Lakes region of North America. Previous workers have commonly used seismic-reflection data (Great Lakes International Multidisciplinary Program on Crustal Evolution [GLIMPCE] line A) to demonstr

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  V. J. Grauch, Eric D. Anderson, Samuel J. Heller, Esther K. Stewart, Laurel G. Woodruff

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  Ecosystems Mission Area, Geology, Geophysics, and Geochemistry Science Center, Northern Rocky Mountain Science Center

  May 1, 2020

  Ore deposits: Origin, exploration, and exploitation

  No abstract available.

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  Eric D. Anderson

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  Geology, Geophysics, and Geochemistry Science Center

  June 4, 2019

  Geological and geophysical data for a three-dimensional view—Inside the San Juan and Silverton Calderas, Southern Rocky Mountains Volcanic Field, Silverton, Colorado

  IntroductionThe San Juan-Silverton caldera complex located near Silverton, Colorado, in the Southern Rocky Mountains volcanic field is an ideal natural laboratory for furthering the understanding of shallow-to-deep volcanic-related mineral systems. Recent advances in geophysical data processing and three-dimensional (3D) model construction will help to characterize shallow properties important for

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  Douglas B. Yager, Eric D. Anderson, Maria Deszcz-Pan, Brian D. Rodriguez, Bruce D. Smith

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

  November 7, 2018

  Descriptive models for epithermal gold-silver deposits

  Epithermal gold-silver deposits are vein, stockwork, disseminated, and replacement deposits that are mined primarily for their gold and silver contents; some deposits also contain substantial resources of lead, zinc, copper, and (or) mercury. These deposits form in the uppermost parts of the crust, at depths less than about 1,500 meters below the water table, and at temperatures below about 300 °C

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  David A. John, Peter G. Vikre, Edward A. du Bray, Richard J. Blakely, David L. Fey, Barnaby W. Rockwell, Jeffrey L. Mauk, Eric D. Anderson, Frederick T. Graybeal

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  Ecosystems Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Western Fisheries Research Center, Central Energy Resources Science Center
• News
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  July 13, 2023

  Bipartisan Infrastructure Law Funding Helps Map Critical Mineral Resources in Montana

  RESTON, Va. — The U.S. Geological Survey will invest more than $1.9 million to map critical mineral resources in Montana in partnership with the Monta...

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  July 6, 2023

  Media Alert: The Montana Bureau of Mines and Geology and U.S. Geological Survey announce low-level helicopter flights in Southwest Montana

  Editor: In the public interest and in accordance with the Federal Aviation Administration regulations, the MBMG and USGS are announcing this low-level...

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