Philip J. Brown
A Geophysicist having over 25 years experience with geophysical operations, multidisciplinary geophysical data processing, joint earth-science data inversion and interpretation, software development and documentation, geodetic positioning, GIS, data base architecture, as well as engineering and repairing acquisition hardware. Currently develop and administer cloud- and web-based solutions fo
- Geophysical and petrophysical technical expertise regarding ground-based, offshore, airborne, wire-line, and Measurement-While-Drilling (MWD) exploration tools utilizing multi-component (full tensor) -seismic, -potential-field, -electrical, and nuclear methods.
- Joint inversion and geologic interpretation of geophysical and petrophysical multi-dimensional data employing novel non-linear statistical methods and data-driven techniques.
- Interactive development environment (IDE) experience with Microsoft Visual Studio (VS), Eclipse, Jupyter, VS Code, and KDevelop.
- Data Base, GIS Development, and Content Management using C++, Visual Basic, JavaScript, Python, MySQL, phpMyAdmin, Joomla, WordPress, Drupal, ArcGIS Online, Oasis montaj, JSON, XML, HTML, CSS, Google Application Scripting (GAS), ScienceBase API, USGS Publications Warehouse API, USGS Metadata Wizard API, USGS Active Directory API, and Amazon Web Services (AWS).
- Earth Science related, object-oriented software development using GitHub, C++, Visual Basic, JavaScript, Python, Fortran, R, IDL, SQL, PHP, HTML, XML, CSS, DOS Script, LabView, MatLab, and Geosoft Oasis montaj GX/OMS.
- Light-Client and Web Development using HTML, PHP, JavaScript, CSS, XML, Joomla, WordPress, Drupal, USGS CMS, JSON, and Adobe Creative Design Suite.
- Computing platform application development for 32- and 64- bit MS Windows NT, 2000, 2002, XP, 7 and 10; Cygwin; Macintosh OS-X; Linux Gnome, K, and Ubuntu Desktops; Unix X-Windows; NEXT; DOS; VMS/VAX; as well as various proprietary and/or hand-held systems including real-time computing hardware used for data acquisition.
- Land Surveying, Down-Hole Directional Surveying, and Real-Time Kinematic (RTK) Differential Global Positioning Systems (GPS). Blue Marble type visualizations.
Science and Products
Data Management and Spatial Studies - GGGSC
We provide support for geospatial analyses, mobile field data collection, management of geospatial collections including documentation, and distribution of all dataset types (geophysical, geochemistry, remote sensing (hyperspectral), etc.). GIS and data management support are provided including hyperspectral and geophysical studies that improve capabilities and applications for investigating...
Mineral Resource Assessment Training
The USGS Mineral Resources Program conducts mineral resource assessments and is training USGS scientists in how to conduct these assessments for future work. As a practical exercise, the scientists will conduct an assessment for tungsten in the U.S.
Filter Total Items: 27
Density and magnetic susceptibility measurements on Archean rocks, northwestern Minnesota, 2021 Density and magnetic susceptibility measurements on Archean rocks, northwestern Minnesota, 2021
Rock physical property measurements were collected on core samples to help understand the causative sources of gravity and magnetic survey anomalies in northwestern Minnesota. A total of 410 measurements of magnetic susceptibility and density on Archean core samples from 20 boreholes have been conducted. The measurements aid in interpretation of gravity and airborne magnetic data that...
Airborne Magnetic and Radiometric Survey over parts of central and northern Florida and southeastern Georgia, 2023-2024 Airborne Magnetic and Radiometric Survey over parts of central and northern Florida and southeastern Georgia, 2023-2024
This data release provides digital flight-line and gridded data for a high-resolution airborne magnetic and radiometric survey over parts of central and northeastern Florida and southeastern Georgia. The survey was acquired as part of the USGS Earth Mapping Resource Initiative (Earth MRI) to improve our understanding of the fundamental geologic framework of the region with applications...
Airborne magnetic and radiometric survey, Sierra Madre-Elkhead Mountains-Medicine Bow Mountains region, Wyoming and Colorado, 2023-2024 Airborne magnetic and radiometric survey, Sierra Madre-Elkhead Mountains-Medicine Bow Mountains region, Wyoming and Colorado, 2023-2024
This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over the Sierra Madre-Elkhead Mountains-Medicine Bow Mountains region of southern Wyoming and northern Colorado. The airborne survey was funded by the Earth Mapping Resources Initiative. The survey was designed to meet complementary needs related to geologic mapping and...
Magnetotelluric sounding data, Rio Grande rift, New Mexico, 1997-2004 Magnetotelluric sounding data, Rio Grande rift, New Mexico, 1997-2004
This data set includes the magnetotelluric (MT) sounding data collected from 1997 to 2004 in and near the Rio Grande rift, New Mexico. The U.S. Geological Survey conducted a series of multidisciplinary studies, including audiomagnetotelluric (AMT) surveys, in the Rio Grande rift to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits...
Audiomagnetotelluric sounding data, Rio Grande rift, New Mexico, 1997-2004 Audiomagnetotelluric sounding data, Rio Grande rift, New Mexico, 1997-2004
This data set includes the audio-magnetotelluric (AMT) sounding data collected from 1997 to 2004 in and near the Rio Grande rift, New Mexico. The U.S. Geological Survey conducted a series of multidisciplinary studies, including magnetotelluric surveys, in the Rio Grande rift to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits...
Principal facts of regional gravity data in the Medicine Bow Mountains, Wyoming, 2022-2024 Principal facts of regional gravity data in the Medicine Bow Mountains, Wyoming, 2022-2024
Gravity data were collected in 2022-2024 to assist in mapping surface and subsurface geology in the Medicine Bow Mountains of southern Wyoming. This data release provides principal facts for 738 new gravity stations that were acquired to supplement existing public gravity data coverage.
Principal facts of regional gravity data in the central Upper Peninsula, Michigan, 2022-2023 Principal facts of regional gravity data in the central Upper Peninsula, Michigan, 2022-2023
Gravity data were collected in 2022 and 2023 to assist in mapping surface and subsurface geology in the central Upper Peninsula of Michigan. This data release provides principal facts for 666 new gravity stations that were acquired to supplement existing public gravity data coverage.
Density and magnetic susceptibility measurements on Precambrian rocks in the central Upper Peninsula, Michigan, 2021-2022 Density and magnetic susceptibility measurements on Precambrian rocks in the central Upper Peninsula, Michigan, 2021-2022
The U.S. Geological Survey (USGS) collected rock physical property measurements to help understand causative sources of gravity and magnetic survey anomalies in the central Upper Peninsula of Michigan. A total of 1,460 measurements of magnetic susceptibility and density from 61 outcrops and 37 boreholes have been conducted on Precambrian rocks. The measurements aid in interpretation of...
Magnetotelluric sounding data across the Idaho Batholith, Payette National Forest, Idaho, 1989 Magnetotelluric sounding data across the Idaho Batholith, Payette National Forest, Idaho, 1989
This dataset includes the magnetotelluric (MT) sounding data collected in 1989 across the Idaho Batholith, Payette National Forest, Idaho, by the U.S. Geological Survey (USGS). The primary focus is on geologic elements that relate to the Late Cretaceous Idaho batholith geometry and the development of the Yellow Pine mining district and Stibnite mining area. Twenty MT soundings along one...
Airborne magnetic and radiometric survey of the Wet Mountains and surrounding region, Custer and Fremont Counties, south-central Colorado, 2021 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...
Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990 Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990
The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Science Analytics and Synthesis (SAS) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Loma Prieta, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989...
Airborne Magnetic Survey, Michigan Upper Peninsula Area, 2008 Airborne Magnetic Survey, Michigan Upper Peninsula Area, 2008
This publication provides digital flight line data for a high-resolution magnetic survey over an area of the west-central Upper Peninsula of Michigan. The survey was flown in 2008 by Aeroquest under contract to Kennecott Eagle Minerals Company using a fixed-wing aircraft with a magnetometer mounted in a tail stinger. The USGS has obtained this 66,074 line km subset of the survey dataset...
Filter Total Items: 21
Synergy between geology and geophysics in graphite mineral resource assessment Synergy between geology and geophysics in graphite mineral resource assessment
Graphite is designated as a critical mineral by the U.S. Government due to its essential role in modern technology and its vulnerability to supply chain disruption. To evaluate domestic graphite resources, the U.S. Geological Survey (USGS) conducted two airborne electromagnetic (AEM) surveys as part of the Earth Mapping Resources Initiative (Earth MRI) over prospective areas in the...
Authors
Patricia Macqueen, George Case, Paul Bedrosian, Jane Hammarstrom, Susan M. Karl, Graham Lederer, Elizabeth Bollen, John Whitmore, Dane VanDervoort, Abraham Emond, Logan Fusso, Philip Brown, Gregory J. Walsh, Keith Labay, Martha Stokes, Andrew Arnold Stewart
Tungsten resources of the northern Rocky Mountains, Montana and Idaho— A synthesis and quantitative assessment of skarn-hosted resources Tungsten resources of the northern Rocky Mountains, Montana and Idaho— A synthesis and quantitative assessment of skarn-hosted resources
Mineral resource assessments performed by the U.S. Geological Survey provide a synthesis of available information about the location of known and suspected mineral deposits. This study focuses on skarn-hosted tungsten resources in the northern Rocky Mountain region of east-central Idaho and western Montana which have seen moderate tungsten trioxide production in the past from a variety...
Authors
Allen Andersen, Margaret Goldman, Mitchell Bennett, Connie Dicken, Philip Brown, Heather Parks
Tungsten skarn potential of the Yukon-Tanana Upland, eastern Alaska, USA—A mineral resource assessment Tungsten skarn potential of the Yukon-Tanana Upland, eastern Alaska, USA—A mineral resource assessment
Tungsten (W) is used in a variety of industrial and technological applications and has been identified as a critical mineral for the United States, India, the European Union, and other countries. These countries rely on W imports mostly from China, which leaves them vulnerable to supply disruption. Consequently, the U.S. government has a current initiative to understand domestic resource...
Authors
George Case, Garth Graham, Erin Marsh, Ryan D. Taylor, Carlin Green, Philip Brown, Keith Labay
Geophysical, geochemical, and mineralogical data from the Pebble Cu-Au-Mo porphyry deposit area, southwest Alaska: Contributions to assessment techniques for concealed mineral resources Geophysical, geochemical, and mineralogical data from the Pebble Cu-Au-Mo porphyry deposit area, southwest Alaska: Contributions to assessment techniques for concealed mineral resources
In 2007, the U.S. Geological Survey began a multidisciplinary study in southwest Alaska to investigate the setting and detectability of mineral deposits in concealed volcanic and glacial terranes. The study area hosts the world-class Pebble porphyry Cu-Au-Mo deposit, and through collaboration with the Pebble Limited Partnership, a range of geophysical and geochemical investigations was...
Authors
E. D. Anderson, S. Smith, S. Giles, Matthew Granitto, R. G. Eppinger, P. Bedrosian, A. K. Shah, K.D. Kelley, D.L. Fey, B. J. Minsley, P. J. Brown
Regional magnetic domains of the Circum-Arctic: A framework for geodynamic interpretation Regional magnetic domains of the Circum-Arctic: A framework for geodynamic interpretation
We identify and discuss 57 magnetic anomaly pattern domains spanning the Circum-Arctic. The domains are based on analysis of a new Circum-Arctic data compilation. The magnetic anomaly patterns can be broadly related to general geodynamic classification of the crust into stable, deformed (magnetic and nonmagnetic), deep magnetic high, oceanic and large igneous province domains. We compare...
Authors
R. Saltus, E. Miller, C. Gaina, P. J. Brown
A first look at the petroleum geology of the Lomonosov Ridge microcontinent, Arctic Ocean A first look at the petroleum geology of the Lomonosov Ridge microcontinent, Arctic Ocean
The Lomonosov microcontinent is an elongated continental fragment that transects the Arctic Ocean between North America and Siberia via the North Pole. Although it lies beneath polar pack ice, the geological framework of the microcontinent is inferred from sparse seismic reflection data, a few cores, potential field data and the geology of its conjugate margin in the Barents–Kara Shelf...
Authors
Thomas Moore, Arthur Grantz, Janet Pitman, Philip J. Brown
Aeromagnetic survey of Howard Pass quadrangle and the East half of Misheguk Mountain quadrangle, Alaska—a Web site for the distribution of data Aeromagnetic survey of Howard Pass quadrangle and the East half of Misheguk Mountain quadrangle, Alaska—a Web site for the distribution of data
U.S. Geological Survey Open-File-Report 2009-1256 is for the preliminary release of magnetic data (and associated contractor reports) for an airborne survey in the Brooks Range, northwest of Bettles, Alaska.
Authors
Philip J. Brown
2006 Compilation of Alaska gravity data and historical reports 2006 Compilation of Alaska gravity data and historical reports
Gravity anomalies provide fundamental geophysical information about Earth structure and dynamics. To increase geologic and geodynamic understanding of Alaska, the U.S. Geological Survey (USGS) has collected and processed Alaska gravity data for the past 50 years. This report introduces and describes an integrated, State-wide gravity database and provides accompanying gravity calculation...
Authors
Richard Saltus, Philip Brown, Robert Morin, Patricia Hill
Assessment of undiscovered oil and gas resources of the West Greenland-East Canada Province, 2008 Assessment of undiscovered oil and gas resources of the West Greenland-East Canada Province, 2008
The U.S. Geological Survey (USGS) recently assessed the undiscovered oil and gas potential of the West Greenland-East Canada Province as part of the USGS Circum-Arctic Oil and Gas Resource Appraisal effort. The West Greenland-East Canada Province is essentially the offshore area between west Greenland and east Canada and includes Baffin Bay, Davis Strait, Lancaster Sound, and Nares...
Authors
Christopher Schenk, Kenneth Bird, Philip Brown, Ronald R. Charpentier, Donald Gautier, David Houseknecht, Timothy R. Klett, Mark Pawlewicz, Anjana Shah, Marilyn E. Tennyson
Aeromagnetic survey of Dillingham area in southwest Alaska, a website for the preliminary distribution of data Aeromagnetic survey of Dillingham area in southwest Alaska, a website for the preliminary distribution of data
An airborne high-resolution magnetic survey was completed over the Dillingham and Nushagak Bay and Naknek area in southwestern Alaska. The flying was undertaken by McPhar Geosurveys Ltd. on behalf of the United States Geological Survey (USGS). First tests and calibration flights were completed by August 26th, 2005 and data acquisition was initiated on September 1st, 2005. The final data...
Authors
Water Resources Division U.S. Geological Survey
Concepts and procedures required for successful reduction of tensor magnetic gradiometer data obtained from an unexploded ordnance detection demonstration at Yuma Proving Grounds, Arizona Concepts and procedures required for successful reduction of tensor magnetic gradiometer data obtained from an unexploded ordnance detection demonstration at Yuma Proving Grounds, Arizona
On March 12, 2003, data were gathered at Yuma Proving Grounds, in Arizona, using a Tensor Magnetic Gradiometer System (TMGS). This report shows how these data were processed and explains concepts required for successful TMGS data reduction. Important concepts discussed include extreme attitudinal sensitivity of vector measurements, low attitudinal sensitivity of gradient measurements...
Authors
Robert Bracken, Philip Brown
Calibrating a tensor magnetic gradiometer using spin data Calibrating a tensor magnetic gradiometer using spin data
Scalar magnetic data are often acquired to discern characteristics of geologic source materials and buried objects. It is evident that a great deal can be done with scalar data, but there are significant advantages to direct measurement of the magnetic gradient tensor in applications with nearby sources, such as unexploded ordnance (UXO). To explore these advantages, we adapted a...
Authors
Robert Bracken, David Smith, Philip J. Brown
Science and Products
Data Management and Spatial Studies - GGGSC
We provide support for geospatial analyses, mobile field data collection, management of geospatial collections including documentation, and distribution of all dataset types (geophysical, geochemistry, remote sensing (hyperspectral), etc.). GIS and data management support are provided including hyperspectral and geophysical studies that improve capabilities and applications for investigating...
Mineral Resource Assessment Training
The USGS Mineral Resources Program conducts mineral resource assessments and is training USGS scientists in how to conduct these assessments for future work. As a practical exercise, the scientists will conduct an assessment for tungsten in the U.S.
Filter Total Items: 27
Density and magnetic susceptibility measurements on Archean rocks, northwestern Minnesota, 2021 Density and magnetic susceptibility measurements on Archean rocks, northwestern Minnesota, 2021
Rock physical property measurements were collected on core samples to help understand the causative sources of gravity and magnetic survey anomalies in northwestern Minnesota. A total of 410 measurements of magnetic susceptibility and density on Archean core samples from 20 boreholes have been conducted. The measurements aid in interpretation of gravity and airborne magnetic data that...
Airborne Magnetic and Radiometric Survey over parts of central and northern Florida and southeastern Georgia, 2023-2024 Airborne Magnetic and Radiometric Survey over parts of central and northern Florida and southeastern Georgia, 2023-2024
This data release provides digital flight-line and gridded data for a high-resolution airborne magnetic and radiometric survey over parts of central and northeastern Florida and southeastern Georgia. The survey was acquired as part of the USGS Earth Mapping Resource Initiative (Earth MRI) to improve our understanding of the fundamental geologic framework of the region with applications...
Airborne magnetic and radiometric survey, Sierra Madre-Elkhead Mountains-Medicine Bow Mountains region, Wyoming and Colorado, 2023-2024 Airborne magnetic and radiometric survey, Sierra Madre-Elkhead Mountains-Medicine Bow Mountains region, Wyoming and Colorado, 2023-2024
This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over the Sierra Madre-Elkhead Mountains-Medicine Bow Mountains region of southern Wyoming and northern Colorado. The airborne survey was funded by the Earth Mapping Resources Initiative. The survey was designed to meet complementary needs related to geologic mapping and...
Magnetotelluric sounding data, Rio Grande rift, New Mexico, 1997-2004 Magnetotelluric sounding data, Rio Grande rift, New Mexico, 1997-2004
This data set includes the magnetotelluric (MT) sounding data collected from 1997 to 2004 in and near the Rio Grande rift, New Mexico. The U.S. Geological Survey conducted a series of multidisciplinary studies, including audiomagnetotelluric (AMT) surveys, in the Rio Grande rift to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits...
Audiomagnetotelluric sounding data, Rio Grande rift, New Mexico, 1997-2004 Audiomagnetotelluric sounding data, Rio Grande rift, New Mexico, 1997-2004
This data set includes the audio-magnetotelluric (AMT) sounding data collected from 1997 to 2004 in and near the Rio Grande rift, New Mexico. The U.S. Geological Survey conducted a series of multidisciplinary studies, including magnetotelluric surveys, in the Rio Grande rift to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits...
Principal facts of regional gravity data in the Medicine Bow Mountains, Wyoming, 2022-2024 Principal facts of regional gravity data in the Medicine Bow Mountains, Wyoming, 2022-2024
Gravity data were collected in 2022-2024 to assist in mapping surface and subsurface geology in the Medicine Bow Mountains of southern Wyoming. This data release provides principal facts for 738 new gravity stations that were acquired to supplement existing public gravity data coverage.
Principal facts of regional gravity data in the central Upper Peninsula, Michigan, 2022-2023 Principal facts of regional gravity data in the central Upper Peninsula, Michigan, 2022-2023
Gravity data were collected in 2022 and 2023 to assist in mapping surface and subsurface geology in the central Upper Peninsula of Michigan. This data release provides principal facts for 666 new gravity stations that were acquired to supplement existing public gravity data coverage.
Density and magnetic susceptibility measurements on Precambrian rocks in the central Upper Peninsula, Michigan, 2021-2022 Density and magnetic susceptibility measurements on Precambrian rocks in the central Upper Peninsula, Michigan, 2021-2022
The U.S. Geological Survey (USGS) collected rock physical property measurements to help understand causative sources of gravity and magnetic survey anomalies in the central Upper Peninsula of Michigan. A total of 1,460 measurements of magnetic susceptibility and density from 61 outcrops and 37 boreholes have been conducted on Precambrian rocks. The measurements aid in interpretation of...
Magnetotelluric sounding data across the Idaho Batholith, Payette National Forest, Idaho, 1989 Magnetotelluric sounding data across the Idaho Batholith, Payette National Forest, Idaho, 1989
This dataset includes the magnetotelluric (MT) sounding data collected in 1989 across the Idaho Batholith, Payette National Forest, Idaho, by the U.S. Geological Survey (USGS). The primary focus is on geologic elements that relate to the Late Cretaceous Idaho batholith geometry and the development of the Yellow Pine mining district and Stibnite mining area. Twenty MT soundings along one...
Airborne magnetic and radiometric survey of the Wet Mountains and surrounding region, Custer and Fremont Counties, south-central Colorado, 2021 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...
Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990 Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990
The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Science Analytics and Synthesis (SAS) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Loma Prieta, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989...
Airborne Magnetic Survey, Michigan Upper Peninsula Area, 2008 Airborne Magnetic Survey, Michigan Upper Peninsula Area, 2008
This publication provides digital flight line data for a high-resolution magnetic survey over an area of the west-central Upper Peninsula of Michigan. The survey was flown in 2008 by Aeroquest under contract to Kennecott Eagle Minerals Company using a fixed-wing aircraft with a magnetometer mounted in a tail stinger. The USGS has obtained this 66,074 line km subset of the survey dataset...
Filter Total Items: 21
Synergy between geology and geophysics in graphite mineral resource assessment Synergy between geology and geophysics in graphite mineral resource assessment
Graphite is designated as a critical mineral by the U.S. Government due to its essential role in modern technology and its vulnerability to supply chain disruption. To evaluate domestic graphite resources, the U.S. Geological Survey (USGS) conducted two airborne electromagnetic (AEM) surveys as part of the Earth Mapping Resources Initiative (Earth MRI) over prospective areas in the...
Authors
Patricia Macqueen, George Case, Paul Bedrosian, Jane Hammarstrom, Susan M. Karl, Graham Lederer, Elizabeth Bollen, John Whitmore, Dane VanDervoort, Abraham Emond, Logan Fusso, Philip Brown, Gregory J. Walsh, Keith Labay, Martha Stokes, Andrew Arnold Stewart
Tungsten resources of the northern Rocky Mountains, Montana and Idaho— A synthesis and quantitative assessment of skarn-hosted resources Tungsten resources of the northern Rocky Mountains, Montana and Idaho— A synthesis and quantitative assessment of skarn-hosted resources
Mineral resource assessments performed by the U.S. Geological Survey provide a synthesis of available information about the location of known and suspected mineral deposits. This study focuses on skarn-hosted tungsten resources in the northern Rocky Mountain region of east-central Idaho and western Montana which have seen moderate tungsten trioxide production in the past from a variety...
Authors
Allen Andersen, Margaret Goldman, Mitchell Bennett, Connie Dicken, Philip Brown, Heather Parks
Tungsten skarn potential of the Yukon-Tanana Upland, eastern Alaska, USA—A mineral resource assessment Tungsten skarn potential of the Yukon-Tanana Upland, eastern Alaska, USA—A mineral resource assessment
Tungsten (W) is used in a variety of industrial and technological applications and has been identified as a critical mineral for the United States, India, the European Union, and other countries. These countries rely on W imports mostly from China, which leaves them vulnerable to supply disruption. Consequently, the U.S. government has a current initiative to understand domestic resource...
Authors
George Case, Garth Graham, Erin Marsh, Ryan D. Taylor, Carlin Green, Philip Brown, Keith Labay
Geophysical, geochemical, and mineralogical data from the Pebble Cu-Au-Mo porphyry deposit area, southwest Alaska: Contributions to assessment techniques for concealed mineral resources Geophysical, geochemical, and mineralogical data from the Pebble Cu-Au-Mo porphyry deposit area, southwest Alaska: Contributions to assessment techniques for concealed mineral resources
In 2007, the U.S. Geological Survey began a multidisciplinary study in southwest Alaska to investigate the setting and detectability of mineral deposits in concealed volcanic and glacial terranes. The study area hosts the world-class Pebble porphyry Cu-Au-Mo deposit, and through collaboration with the Pebble Limited Partnership, a range of geophysical and geochemical investigations was...
Authors
E. D. Anderson, S. Smith, S. Giles, Matthew Granitto, R. G. Eppinger, P. Bedrosian, A. K. Shah, K.D. Kelley, D.L. Fey, B. J. Minsley, P. J. Brown
Regional magnetic domains of the Circum-Arctic: A framework for geodynamic interpretation Regional magnetic domains of the Circum-Arctic: A framework for geodynamic interpretation
We identify and discuss 57 magnetic anomaly pattern domains spanning the Circum-Arctic. The domains are based on analysis of a new Circum-Arctic data compilation. The magnetic anomaly patterns can be broadly related to general geodynamic classification of the crust into stable, deformed (magnetic and nonmagnetic), deep magnetic high, oceanic and large igneous province domains. We compare...
Authors
R. Saltus, E. Miller, C. Gaina, P. J. Brown
A first look at the petroleum geology of the Lomonosov Ridge microcontinent, Arctic Ocean A first look at the petroleum geology of the Lomonosov Ridge microcontinent, Arctic Ocean
The Lomonosov microcontinent is an elongated continental fragment that transects the Arctic Ocean between North America and Siberia via the North Pole. Although it lies beneath polar pack ice, the geological framework of the microcontinent is inferred from sparse seismic reflection data, a few cores, potential field data and the geology of its conjugate margin in the Barents–Kara Shelf...
Authors
Thomas Moore, Arthur Grantz, Janet Pitman, Philip J. Brown
Aeromagnetic survey of Howard Pass quadrangle and the East half of Misheguk Mountain quadrangle, Alaska—a Web site for the distribution of data Aeromagnetic survey of Howard Pass quadrangle and the East half of Misheguk Mountain quadrangle, Alaska—a Web site for the distribution of data
U.S. Geological Survey Open-File-Report 2009-1256 is for the preliminary release of magnetic data (and associated contractor reports) for an airborne survey in the Brooks Range, northwest of Bettles, Alaska.
Authors
Philip J. Brown
2006 Compilation of Alaska gravity data and historical reports 2006 Compilation of Alaska gravity data and historical reports
Gravity anomalies provide fundamental geophysical information about Earth structure and dynamics. To increase geologic and geodynamic understanding of Alaska, the U.S. Geological Survey (USGS) has collected and processed Alaska gravity data for the past 50 years. This report introduces and describes an integrated, State-wide gravity database and provides accompanying gravity calculation...
Authors
Richard Saltus, Philip Brown, Robert Morin, Patricia Hill
Assessment of undiscovered oil and gas resources of the West Greenland-East Canada Province, 2008 Assessment of undiscovered oil and gas resources of the West Greenland-East Canada Province, 2008
The U.S. Geological Survey (USGS) recently assessed the undiscovered oil and gas potential of the West Greenland-East Canada Province as part of the USGS Circum-Arctic Oil and Gas Resource Appraisal effort. The West Greenland-East Canada Province is essentially the offshore area between west Greenland and east Canada and includes Baffin Bay, Davis Strait, Lancaster Sound, and Nares...
Authors
Christopher Schenk, Kenneth Bird, Philip Brown, Ronald R. Charpentier, Donald Gautier, David Houseknecht, Timothy R. Klett, Mark Pawlewicz, Anjana Shah, Marilyn E. Tennyson
Aeromagnetic survey of Dillingham area in southwest Alaska, a website for the preliminary distribution of data Aeromagnetic survey of Dillingham area in southwest Alaska, a website for the preliminary distribution of data
An airborne high-resolution magnetic survey was completed over the Dillingham and Nushagak Bay and Naknek area in southwestern Alaska. The flying was undertaken by McPhar Geosurveys Ltd. on behalf of the United States Geological Survey (USGS). First tests and calibration flights were completed by August 26th, 2005 and data acquisition was initiated on September 1st, 2005. The final data...
Authors
Water Resources Division U.S. Geological Survey
Concepts and procedures required for successful reduction of tensor magnetic gradiometer data obtained from an unexploded ordnance detection demonstration at Yuma Proving Grounds, Arizona Concepts and procedures required for successful reduction of tensor magnetic gradiometer data obtained from an unexploded ordnance detection demonstration at Yuma Proving Grounds, Arizona
On March 12, 2003, data were gathered at Yuma Proving Grounds, in Arizona, using a Tensor Magnetic Gradiometer System (TMGS). This report shows how these data were processed and explains concepts required for successful TMGS data reduction. Important concepts discussed include extreme attitudinal sensitivity of vector measurements, low attitudinal sensitivity of gradient measurements...
Authors
Robert Bracken, Philip Brown
Calibrating a tensor magnetic gradiometer using spin data Calibrating a tensor magnetic gradiometer using spin data
Scalar magnetic data are often acquired to discern characteristics of geologic source materials and buried objects. It is evident that a great deal can be done with scalar data, but there are significant advantages to direct measurement of the magnetic gradient tensor in applications with nearby sources, such as unexploded ordnance (UXO). To explore these advantages, we adapted a...
Authors
Robert Bracken, David Smith, Philip J. Brown