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Garth E Graham

Garth Graham is a Research Geologist with the Geology, Geophysics, and Geochemistry Science Center.

Science and Products

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Image shows a map and key of the United States with mineral locations marked with colored shapes

Critical Minerals Mapping Initiative (CMMI)

The USGS, in combination with Geoscience Australia and the Geological Survey of Canada, formed the Critical Minerals Mapping Initiative (CMMI) in 2019 to combine expertise and collaboratively conduct research on critical mineral resources.
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
link

Critical Minerals Mapping Initiative (CMMI)

The USGS, in combination with Geoscience Australia and the Geological Survey of Canada, formed the Critical Minerals Mapping Initiative (CMMI) in 2019 to combine expertise and collaboratively conduct research on critical mineral resources.
Learn More
link
USGS mineral resource assessment workflow diagram

21st Century Prospecting: AI-assisted Surveying of Critical Mineral Potential

The USGS Mineral Resources Program entered a partnership with the Defense Advanced Research Project Agency (DARPA). The partnership objective is to accelerate advances in science for understanding critical minerals, assessing unknown resources, and increase mineral security for the Nation so USGS can more efficiently assess critical mineral deposits within the United States.
By
Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center
link

21st Century Prospecting: AI-assisted Surveying of Critical Mineral Potential

The USGS Mineral Resources Program entered a partnership with the Defense Advanced Research Project Agency (DARPA). The partnership objective is to accelerate advances in science for understanding critical minerals, assessing unknown resources, and increase mineral security for the Nation so USGS can more efficiently assess critical mineral deposits within the United States.
Learn More
link
USGS science for a changing world

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.
By
Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center
link

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.
Learn More
link
Half-meter-thick quartz veins cut across outcrops of granitic gneiss on Divide Mountain along the Alaska-Yukon border

Tectonic and Metallogenic Evolution of the Yukon-Tanana Upland, Alaska

The Yukon-Tanana upland in eastern interior Alaska is a geologically complex block containing deposits of base-metal, platinum-group-element, and gold-silver-copper mineralization. It also hosts numerous mineral systems that are known or suspected to contain critical minerals.
By
Mineral Resources Program, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center
link

Tectonic and Metallogenic Evolution of the Yukon-Tanana Upland, Alaska

The Yukon-Tanana upland in eastern interior Alaska is a geologically complex block containing deposits of base-metal, platinum-group-element, and gold-silver-copper mineralization. It also hosts numerous mineral systems that are known or suspected to contain critical minerals.
Learn More
Filter Total Items: 14

Training and validation data from the AI for Critical Mineral Assessment Competition

Extracting useful and accurate information from scanned geologic and other earth science maps is a time-consuming and laborious process involving manual human effort. To address this limitation, the USGS partnered with the Defense Advanced Research Projects Agency (DARPA) to run the AI for Critical Mineral Assessment Competition, soliciting innovative solutions for automatically georeferencing and

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

National-Scale Geophysical, Geologic, and Mineral Resource Data and Grids for the United States, Canada, and Australia: Data in Support of the Tri-National Critical Minerals Mapping Initiative

National-scale geologic, geophysical, and mineral resource raster and vector data covering the United States, Canada, and Australia are provided in this data release.  The data were compiled as part of the tri-national Critical Minerals Mapping Initiative (CMMI). The CMMI, established in 2019, is an international science collaboration between the U.S. Geological Survey (USGS), Geoscience Australi
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Geochemical data for stream water samples from streams around the Pogo Deposit and Black Mountain Au occurrences, Big Delta quadrangle, Alaska, 2021

This data release is the result of a hydrogeochemical sampling campaign during summer 2021 to investigate whether high resolution geochemical analysis of waters for element chemistry can be used as an exploration tool for identifying gold-rich occurrences in parts of the Big Delta B-1 and B-2 quadrangles, within the Yukon-Tanana Upland region, Alaska. Historical USGS conventional stream sediment g
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

HySpex by NEO VNIR-1800 and SWIR-384 imaging spectrometer radiance and reflectance data, with associated ASD FieldSpec® NG calibration data, collected at Cripple Creek Victor mine, Cripple Creek, Colorado, 2017

HySpex by NEO (HySpex) VNIR-1800 and SWIR-384 imaging spectrometer radiance data were acquired on September 14, 2017 at the Cresson Pit of the Cripple Creek & Victor mine in Cripple Creek, Colorado. ASD FieldSpec® NG data were collected on September 13 and 14, 2017 at two calibration sites within the Cresson Pit imaged with the HySpex imaging spectrometers. The HySpex VNIR-1800 imaging spectromete
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) geochemical data for apatite grains in rocks and stream sediments from the Taurus porphyry copper deposit area, eastern Tanacross quadrangle, Alaska

Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses of apatite provide trace element concentrations that support indicator mineral studies near the Taurus porphyry Cu-Mo deposit in the eastern Tanacross quadrangle, Alaska. The Taurus deposit and others in the region are mostly concealed, and traditional stream sediment samples typically show subdued geochemical signatu
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Re-Os Geochronologic Data for Porphyry Deposits in the Yukon-Tanana Upland, Eastern Alaska

Rhenium-osmium (Re-Os) geochronology of molybdenite provides a tool to directly date mineralizing events in hydrothermal systems. In the Yukon-Tanana upland of eastern Alaska, numerous molybdenite-bearing porphyry occurrences are recognized. The deposits are related to middle and Late Cretaceous granitoids (Kreiner and others, 2019; 2020). Some of the porphyry districts have multiple superimposed
By
Alaska Science Center

Geochemical data for stream water and stream sediment samples from the northeast part of the Tanacross quadrangle, Alaska

This data release is part of a study designed to test geochemical methods that best delineate known mineral deposits in the northeast part of the Tanacross 1 x 3 quadrangle, within the Yukon-Tanana Upland region, Alaska. The total area sampled is about 3,200 km2. Extensive tundra cover and patchy spruce/alder vegetation and very limited outcrop exposure characterize the area. Soils and stream sedi
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Whole rock geochemical data from the eastern part of the Yukon-Tanana Upland region, Alaska, USA

This data release is part of a 2016-2019 study on the geology, geochemistry and geochronology of ore systems in the eastern Yukon-Tanana Upland region, Alaska. Whole rock chemistry was conducted on 185 samples, mostly from Au prospects, with lesser samples from porphyry Cu prospects. Geographically, most samples are from gold prospects near the Pogo Au mine and east to Black Mountain in the Big De
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Electron Probe Microanalyses of apatite, rutile, and titanite from stream sediment and rock samples in the eastern Tanacross quadrangle, eastern Alaska

The exploration for porphyry deposits in some parts of Alaska may require unconventional exploration geochemical methods, depending on type of cover. The Taurus deposit and others in the region are mostly concealed by residual soils that in part include ash and loess, and therefore traditional stream sediment samples typically contain subdued geochemical signatures. Indicator mineral studies inclu
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Denver Microbeam Laboratory

Qualitative Mineral Potential Map of Tungsten Skarn in the Yukon-Tanana Uplands, Eastern Alaska, USA, 2021

This data release supports the paper titled, "Tungsten skarn potential of the Yukon-Tanana Uplands, Eastern Alaska, USA-A mineral resource assessment", published via open-access license in the Journal of Geochemical Exploration and available at: https://doi.org/10.1016/j.gexplo.2020.106700. The data release includes GIS data that map potential for tungsten skarn mineralization in permissive tracts
By
Alaska Science Center

Data and analysis for GIS-based identification of areas that have resource potential for sediment-hosted Pb-Zn deposits in Alaska

This data release contains the analytical results of a spatial analyses for the resource potential of sediment-hosted Pb-Zn (lead-zinc) deposits in the state of Alaska. Sediment-hosted Pb-Zn deposits in Alaska include those contained in carbonate rock and in clastic-dominated sequences. The geographic information system (GIS) analysis queried three publicly available statewide datasets in areas de
By
Mineral Resources Program, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center

Corescan Hyperspectral Core Imager, Mark III system data collected for the characterization of mineral resources near Nabesna, Alaska, 2014-2016

Corescan Hyperspectral Core Imager Mark III (HCI-III) system data were acquired for hand samples, and subsequent billets made from the hand samples, collected during the U.S. Geological Survey (USGS) 2014, 2015, and 2016 field seasons in the Nabesna area of the eastern Alaska Range. This area contains exposed porphyry deposits and hand samples were collected throughout the region in support of the
By
Geology, Geophysics, and Geochemistry Science Center

Advanced Land Observing Satellite (ALOS) Phased Array Type L-Band Synthetic Aperture Radar (PALSAR) mosaic for the Kahiltna terrane, Alaska, 2007-2010

The U.S. Geological Survey (USGS) has initiated a multi-disciplinary study investigating the applicability of remote sensing technologies for geologic mapping and identification of prospective areas for base and precious metal deposits in remote parts of Alaska. The Kahiltna terrane in southwestern Alaska was selected for investigation because of its known mineral deposits and potential for additi
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
Filter Total Items: 33

Annual review 2023: Critical minerals

No abstract available.
Authors
Graham W. Lederer, James V. Jones, Darcy McPhee, Jeffrey L. Mauk, Robert R. Seal, Kate M. Campbell, Jane M. Hammarstrom, Paul A. Bedrosian, Patricia Grace Macqueen, Garth E. Graham, Federico Solano, George N. D. Case, David George Pineault
By
Ecosystems Mission Area, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center, Geology, Energy & Minerals Science Center, National Minerals Information Center

Hydrothermal monazite and xenotime chemistry as genetic discriminators for intrusion-related and orogenic gold deposits: Implications for an orogenic origin of the Pogo gold deposit, Alaska

Attempts to geochemically distinguish between metamorphic-hydrothermal systems that form orogenic gold deposits and both reduced and oxidized magmatic-hydrothermal systems using isotopes or metal associations have proven ambiguous, particularly for orogenic gold and reduced intrusion-related gold systems. The absence of conclusive geochemical discriminators and the overlap in geologic characterist

Authors
Ryan Taylor, Garth E. Graham, Heather A. Lowers
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Denver Microbeam Laboratory

National- to continental-scale governmental geophysical efforts for critical mineral mapping, USA

The U.S. Geological Survey (USGS) has established robust collaborations with domestic state and international geological surveys to provide geophysical and other types of earth science data that act to underpin critical mineral research efforts across the United States, Canada, and Australia. The Earth Mapping Resource Initiative (EMRI) is a national-scale collaborative effort with state geologic
Authors
Anne E. McCafferty, Chelsea Morgan Amaral, Garth E. Graham
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

Critical minerals: Germanium and cobalt in the Bornite deposit, southwestern Brooks Range, Alaska

Increasing demand for Ge and Co has led to a renewed interest and focus on advancing our understanding of the occurrence, distribution, and sequestration of these critical elements in known ore deposits. A workflow using a variety of analytical techniques and co-registered datasets has been developed and was applied to the carbonate hosted Bornite Cu-Co (Zn,-Ge) deposit in Alaska, where a new oreb

Authors
Katharina Pfaff, Garth E. Graham, Alex Jones, Karen D. Kelley
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Reconnaissance mineral and cathodoluminescence studies of gold occurrences in the Pogo-Black Mountain area, eastern interior Alaska, USA

The Pogo Au deposit is the largest of a number of gold occurrences in eastern interior Alaska, that occur along a broad trend from west of Pogo to Black Mountain. Some of these occurrences are hosted in amphibolite facies gneisses and others in mid-Cretaceous igneous rocks that intruded the older metamorphic rocks. All occurrences contain arsenopyrite and pyrite. Whole rock geochemical trends dist

Authors
Garth E. Graham, Erin E. Marsh, Heather A. Lowers, Ryan Taylor
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Denver Microbeam Laboratory

Automated georeferencing and feature extraction of geologic maps and mineral sites

The predictive power of mineral prospectivity analysis depends on high quality, spatially accurate, analysis-ready datasets. Of paramount importance are geologic maps and mineral site data, but the state of readiness for utilizing these datasets remains sub-optimal for advanced computational techniques. As the U.S. Geological Survey (USGS) fulfils its mission to map the distribution of critical mi
Authors
Graham W. Lederer, Joshua Mark Rosera, Margaret A. Goldman, Garth E. Graham, Asitang Mishra, Amanda Towler, Brian Wilson, Dustin Graf, Michael Milano, Elizabeth Roberts, Gabrielle Hedrick, Carsten Oertel, Anastassios Dardas, Thomas McEntee
By
Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center

Applications of natural language processing to geoscience text data and prospectivity modelling

Geological maps are powerful models for visualizing the complex distribution of rock types through space and time. However, the descriptive information that forms the basis for a preferred map interpretation is typically stored in geological map databases as unstructured text data that are difficult to use in practice. Herein we apply natural language processing (NLP) to geoscientific text data fr
Authors
Christopher J.M. Lawley, Michael G. Gadd, Mohammad Parsa, Graham W. Lederer, Garth E. Graham, Arianne Ford
By
Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center

Geochronology and mapping constraints on the time-space evolution of the igneous and hydrothermal systems in the Taurus Cu-Mo district, eastern Alaska

The Taurus porphyry Cu-Mo district contains four mineralized porphyry centers in the eastern interior of Alaska. All four centers were emplaced during a magmatic episode that spanned from ca. 72 to 67 Ma, with seven distinct igneous suites. Each igneous suite resulted in hydrothermal alteration and mineralization, with younger pulses overprinting older pulses. Each magmatic-hydrothermal system is
Authors
Douglas C. Kreiner, Christopher Holm-Denoma, Laura Pianowski, Zachary Flood, David J. Stevenson, Garth E. Graham, Jorge A. Vazquez, Robert A Creaser
By
Mineral Resources Program, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center

Results of automated scanning electron microscope (SEM) analyses of rock and stream sediment samples from the Taurus porphyry copper deposit area, Tanacross quadrangle, eastern Alaska

Numerous porphyry copper-molybdenum-gold and epithermal deposits define a belt that extends from Eastern Alaska to western Yukon, Canada. An orientation study conducted near the Taurus porphyry deposit was designed to test methods that require minimal sample collection, preparation, and analytical time to determine the viability of indicator mineral studies as a reconnaissance exploration method.
Authors
Karen D. Kelley, Katharina Pfaff, Garth E. Graham
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

USGS Critical Minerals Review: 2021

In 2021, the U.S. Geological Survey (USGS) continued to play a central role in understanding and anticipating potential supply chain disruptions by defining and quantitatively evaluating mineral criticality. In addition, the USGS continued to evaluate new sources of domestic critical minerals by conducting mineral resource assessments, mapping and surveying regions prospective for critical minera
Authors
Steven M. Fortier, Nedal T. Nassar, Garth E. Graham, Jane M. Hammarstrom, Warren C. Day, Jeffrey L. Mauk, Robert R. Seal
By
National Minerals Information Center

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 potential
Authors
George N. D. Case, Garth E. Graham, Erin E. Marsh, Ryan Taylor, Carlin J. Green, Philip J. Brown, Keith A. Labay
By
Mineral Resources Program, Geology, Energy & Minerals Science Center, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center

Data-driven prospectivity modelling of sediment-hosted Zn-Pb mineral systems and their critical raw materials

Demand for critical raw materials is expected to accelerate over the next few decades due to continued population growth and the shifting consumption patterns of the global economy. Sedimentary basins are important sources for critical raw materials and new discoveries of sediment–hosted Mississippi Valley–type (MVT) and/or clastic–dominated (CD) Zn–Pb deposits are likely required to mitigate futu
Authors
Christopher J. M. Lawley, Anne E. McCafferty, Garth E. Graham, David L. Huston, Karen D. Kelley, Karol Czarnota, Suzanne Paradis, Jan M. Peter, Nathan Hayward, Mike Barlow, Poul Emsbo, Joshua Aaron Coyan, Carma A. San Juan, Michael G. Gadd
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Science and Products

link
Image shows a map and key of the United States with mineral locations marked with colored shapes

Critical Minerals Mapping Initiative (CMMI)

The USGS, in combination with Geoscience Australia and the Geological Survey of Canada, formed the Critical Minerals Mapping Initiative (CMMI) in 2019 to combine expertise and collaboratively conduct research on critical mineral resources.
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
link

Critical Minerals Mapping Initiative (CMMI)

The USGS, in combination with Geoscience Australia and the Geological Survey of Canada, formed the Critical Minerals Mapping Initiative (CMMI) in 2019 to combine expertise and collaboratively conduct research on critical mineral resources.
Learn More
link
USGS mineral resource assessment workflow diagram

21st Century Prospecting: AI-assisted Surveying of Critical Mineral Potential

The USGS Mineral Resources Program entered a partnership with the Defense Advanced Research Project Agency (DARPA). The partnership objective is to accelerate advances in science for understanding critical minerals, assessing unknown resources, and increase mineral security for the Nation so USGS can more efficiently assess critical mineral deposits within the United States.
By
Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center
link

21st Century Prospecting: AI-assisted Surveying of Critical Mineral Potential

The USGS Mineral Resources Program entered a partnership with the Defense Advanced Research Project Agency (DARPA). The partnership objective is to accelerate advances in science for understanding critical minerals, assessing unknown resources, and increase mineral security for the Nation so USGS can more efficiently assess critical mineral deposits within the United States.
Learn More
link
USGS science for a changing world

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.
By
Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center
link

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.
Learn More
link
Half-meter-thick quartz veins cut across outcrops of granitic gneiss on Divide Mountain along the Alaska-Yukon border

Tectonic and Metallogenic Evolution of the Yukon-Tanana Upland, Alaska

The Yukon-Tanana upland in eastern interior Alaska is a geologically complex block containing deposits of base-metal, platinum-group-element, and gold-silver-copper mineralization. It also hosts numerous mineral systems that are known or suspected to contain critical minerals.
By
Mineral Resources Program, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center
link

Tectonic and Metallogenic Evolution of the Yukon-Tanana Upland, Alaska

The Yukon-Tanana upland in eastern interior Alaska is a geologically complex block containing deposits of base-metal, platinum-group-element, and gold-silver-copper mineralization. It also hosts numerous mineral systems that are known or suspected to contain critical minerals.
Learn More
Filter Total Items: 14

Training and validation data from the AI for Critical Mineral Assessment Competition

Extracting useful and accurate information from scanned geologic and other earth science maps is a time-consuming and laborious process involving manual human effort. To address this limitation, the USGS partnered with the Defense Advanced Research Projects Agency (DARPA) to run the AI for Critical Mineral Assessment Competition, soliciting innovative solutions for automatically georeferencing and

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

National-Scale Geophysical, Geologic, and Mineral Resource Data and Grids for the United States, Canada, and Australia: Data in Support of the Tri-National Critical Minerals Mapping Initiative

National-scale geologic, geophysical, and mineral resource raster and vector data covering the United States, Canada, and Australia are provided in this data release.  The data were compiled as part of the tri-national Critical Minerals Mapping Initiative (CMMI). The CMMI, established in 2019, is an international science collaboration between the U.S. Geological Survey (USGS), Geoscience Australi
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Geochemical data for stream water samples from streams around the Pogo Deposit and Black Mountain Au occurrences, Big Delta quadrangle, Alaska, 2021

This data release is the result of a hydrogeochemical sampling campaign during summer 2021 to investigate whether high resolution geochemical analysis of waters for element chemistry can be used as an exploration tool for identifying gold-rich occurrences in parts of the Big Delta B-1 and B-2 quadrangles, within the Yukon-Tanana Upland region, Alaska. Historical USGS conventional stream sediment g
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

HySpex by NEO VNIR-1800 and SWIR-384 imaging spectrometer radiance and reflectance data, with associated ASD FieldSpec® NG calibration data, collected at Cripple Creek Victor mine, Cripple Creek, Colorado, 2017

HySpex by NEO (HySpex) VNIR-1800 and SWIR-384 imaging spectrometer radiance data were acquired on September 14, 2017 at the Cresson Pit of the Cripple Creek & Victor mine in Cripple Creek, Colorado. ASD FieldSpec® NG data were collected on September 13 and 14, 2017 at two calibration sites within the Cresson Pit imaged with the HySpex imaging spectrometers. The HySpex VNIR-1800 imaging spectromete
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) geochemical data for apatite grains in rocks and stream sediments from the Taurus porphyry copper deposit area, eastern Tanacross quadrangle, Alaska

Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses of apatite provide trace element concentrations that support indicator mineral studies near the Taurus porphyry Cu-Mo deposit in the eastern Tanacross quadrangle, Alaska. The Taurus deposit and others in the region are mostly concealed, and traditional stream sediment samples typically show subdued geochemical signatu
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Re-Os Geochronologic Data for Porphyry Deposits in the Yukon-Tanana Upland, Eastern Alaska

Rhenium-osmium (Re-Os) geochronology of molybdenite provides a tool to directly date mineralizing events in hydrothermal systems. In the Yukon-Tanana upland of eastern Alaska, numerous molybdenite-bearing porphyry occurrences are recognized. The deposits are related to middle and Late Cretaceous granitoids (Kreiner and others, 2019; 2020). Some of the porphyry districts have multiple superimposed
By
Alaska Science Center

Geochemical data for stream water and stream sediment samples from the northeast part of the Tanacross quadrangle, Alaska

This data release is part of a study designed to test geochemical methods that best delineate known mineral deposits in the northeast part of the Tanacross 1 x 3 quadrangle, within the Yukon-Tanana Upland region, Alaska. The total area sampled is about 3,200 km2. Extensive tundra cover and patchy spruce/alder vegetation and very limited outcrop exposure characterize the area. Soils and stream sedi
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Whole rock geochemical data from the eastern part of the Yukon-Tanana Upland region, Alaska, USA

This data release is part of a 2016-2019 study on the geology, geochemistry and geochronology of ore systems in the eastern Yukon-Tanana Upland region, Alaska. Whole rock chemistry was conducted on 185 samples, mostly from Au prospects, with lesser samples from porphyry Cu prospects. Geographically, most samples are from gold prospects near the Pogo Au mine and east to Black Mountain in the Big De
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Electron Probe Microanalyses of apatite, rutile, and titanite from stream sediment and rock samples in the eastern Tanacross quadrangle, eastern Alaska

The exploration for porphyry deposits in some parts of Alaska may require unconventional exploration geochemical methods, depending on type of cover. The Taurus deposit and others in the region are mostly concealed by residual soils that in part include ash and loess, and therefore traditional stream sediment samples typically contain subdued geochemical signatures. Indicator mineral studies inclu
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Denver Microbeam Laboratory

Qualitative Mineral Potential Map of Tungsten Skarn in the Yukon-Tanana Uplands, Eastern Alaska, USA, 2021

This data release supports the paper titled, "Tungsten skarn potential of the Yukon-Tanana Uplands, Eastern Alaska, USA-A mineral resource assessment", published via open-access license in the Journal of Geochemical Exploration and available at: https://doi.org/10.1016/j.gexplo.2020.106700. The data release includes GIS data that map potential for tungsten skarn mineralization in permissive tracts
By
Alaska Science Center

Data and analysis for GIS-based identification of areas that have resource potential for sediment-hosted Pb-Zn deposits in Alaska

This data release contains the analytical results of a spatial analyses for the resource potential of sediment-hosted Pb-Zn (lead-zinc) deposits in the state of Alaska. Sediment-hosted Pb-Zn deposits in Alaska include those contained in carbonate rock and in clastic-dominated sequences. The geographic information system (GIS) analysis queried three publicly available statewide datasets in areas de
By
Mineral Resources Program, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center

Corescan Hyperspectral Core Imager, Mark III system data collected for the characterization of mineral resources near Nabesna, Alaska, 2014-2016

Corescan Hyperspectral Core Imager Mark III (HCI-III) system data were acquired for hand samples, and subsequent billets made from the hand samples, collected during the U.S. Geological Survey (USGS) 2014, 2015, and 2016 field seasons in the Nabesna area of the eastern Alaska Range. This area contains exposed porphyry deposits and hand samples were collected throughout the region in support of the
By
Geology, Geophysics, and Geochemistry Science Center

Advanced Land Observing Satellite (ALOS) Phased Array Type L-Band Synthetic Aperture Radar (PALSAR) mosaic for the Kahiltna terrane, Alaska, 2007-2010

The U.S. Geological Survey (USGS) has initiated a multi-disciplinary study investigating the applicability of remote sensing technologies for geologic mapping and identification of prospective areas for base and precious metal deposits in remote parts of Alaska. The Kahiltna terrane in southwestern Alaska was selected for investigation because of its known mineral deposits and potential for additi
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
Filter Total Items: 33

Annual review 2023: Critical minerals

No abstract available.
Authors
Graham W. Lederer, James V. Jones, Darcy McPhee, Jeffrey L. Mauk, Robert R. Seal, Kate M. Campbell, Jane M. Hammarstrom, Paul A. Bedrosian, Patricia Grace Macqueen, Garth E. Graham, Federico Solano, George N. D. Case, David George Pineault
By
Ecosystems Mission Area, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center, Geology, Energy & Minerals Science Center, National Minerals Information Center

Hydrothermal monazite and xenotime chemistry as genetic discriminators for intrusion-related and orogenic gold deposits: Implications for an orogenic origin of the Pogo gold deposit, Alaska

Attempts to geochemically distinguish between metamorphic-hydrothermal systems that form orogenic gold deposits and both reduced and oxidized magmatic-hydrothermal systems using isotopes or metal associations have proven ambiguous, particularly for orogenic gold and reduced intrusion-related gold systems. The absence of conclusive geochemical discriminators and the overlap in geologic characterist

Authors
Ryan Taylor, Garth E. Graham, Heather A. Lowers
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Denver Microbeam Laboratory

National- to continental-scale governmental geophysical efforts for critical mineral mapping, USA

The U.S. Geological Survey (USGS) has established robust collaborations with domestic state and international geological surveys to provide geophysical and other types of earth science data that act to underpin critical mineral research efforts across the United States, Canada, and Australia. The Earth Mapping Resource Initiative (EMRI) is a national-scale collaborative effort with state geologic
Authors
Anne E. McCafferty, Chelsea Morgan Amaral, Garth E. Graham
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

Critical minerals: Germanium and cobalt in the Bornite deposit, southwestern Brooks Range, Alaska

Increasing demand for Ge and Co has led to a renewed interest and focus on advancing our understanding of the occurrence, distribution, and sequestration of these critical elements in known ore deposits. A workflow using a variety of analytical techniques and co-registered datasets has been developed and was applied to the carbonate hosted Bornite Cu-Co (Zn,-Ge) deposit in Alaska, where a new oreb

Authors
Katharina Pfaff, Garth E. Graham, Alex Jones, Karen D. Kelley
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Reconnaissance mineral and cathodoluminescence studies of gold occurrences in the Pogo-Black Mountain area, eastern interior Alaska, USA

The Pogo Au deposit is the largest of a number of gold occurrences in eastern interior Alaska, that occur along a broad trend from west of Pogo to Black Mountain. Some of these occurrences are hosted in amphibolite facies gneisses and others in mid-Cretaceous igneous rocks that intruded the older metamorphic rocks. All occurrences contain arsenopyrite and pyrite. Whole rock geochemical trends dist

Authors
Garth E. Graham, Erin E. Marsh, Heather A. Lowers, Ryan Taylor
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Denver Microbeam Laboratory

Automated georeferencing and feature extraction of geologic maps and mineral sites

The predictive power of mineral prospectivity analysis depends on high quality, spatially accurate, analysis-ready datasets. Of paramount importance are geologic maps and mineral site data, but the state of readiness for utilizing these datasets remains sub-optimal for advanced computational techniques. As the U.S. Geological Survey (USGS) fulfils its mission to map the distribution of critical mi
Authors
Graham W. Lederer, Joshua Mark Rosera, Margaret A. Goldman, Garth E. Graham, Asitang Mishra, Amanda Towler, Brian Wilson, Dustin Graf, Michael Milano, Elizabeth Roberts, Gabrielle Hedrick, Carsten Oertel, Anastassios Dardas, Thomas McEntee
By
Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center

Applications of natural language processing to geoscience text data and prospectivity modelling

Geological maps are powerful models for visualizing the complex distribution of rock types through space and time. However, the descriptive information that forms the basis for a preferred map interpretation is typically stored in geological map databases as unstructured text data that are difficult to use in practice. Herein we apply natural language processing (NLP) to geoscientific text data fr
Authors
Christopher J.M. Lawley, Michael G. Gadd, Mohammad Parsa, Graham W. Lederer, Garth E. Graham, Arianne Ford
By
Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center

Geochronology and mapping constraints on the time-space evolution of the igneous and hydrothermal systems in the Taurus Cu-Mo district, eastern Alaska

The Taurus porphyry Cu-Mo district contains four mineralized porphyry centers in the eastern interior of Alaska. All four centers were emplaced during a magmatic episode that spanned from ca. 72 to 67 Ma, with seven distinct igneous suites. Each igneous suite resulted in hydrothermal alteration and mineralization, with younger pulses overprinting older pulses. Each magmatic-hydrothermal system is
Authors
Douglas C. Kreiner, Christopher Holm-Denoma, Laura Pianowski, Zachary Flood, David J. Stevenson, Garth E. Graham, Jorge A. Vazquez, Robert A Creaser
By
Mineral Resources Program, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center

Results of automated scanning electron microscope (SEM) analyses of rock and stream sediment samples from the Taurus porphyry copper deposit area, Tanacross quadrangle, eastern Alaska

Numerous porphyry copper-molybdenum-gold and epithermal deposits define a belt that extends from Eastern Alaska to western Yukon, Canada. An orientation study conducted near the Taurus porphyry deposit was designed to test methods that require minimal sample collection, preparation, and analytical time to determine the viability of indicator mineral studies as a reconnaissance exploration method.
Authors
Karen D. Kelley, Katharina Pfaff, Garth E. Graham
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

USGS Critical Minerals Review: 2021

In 2021, the U.S. Geological Survey (USGS) continued to play a central role in understanding and anticipating potential supply chain disruptions by defining and quantitatively evaluating mineral criticality. In addition, the USGS continued to evaluate new sources of domestic critical minerals by conducting mineral resource assessments, mapping and surveying regions prospective for critical minera
Authors
Steven M. Fortier, Nedal T. Nassar, Garth E. Graham, Jane M. Hammarstrom, Warren C. Day, Jeffrey L. Mauk, Robert R. Seal
By
National Minerals Information Center

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 potential
Authors
George N. D. Case, Garth E. Graham, Erin E. Marsh, Ryan Taylor, Carlin J. Green, Philip J. Brown, Keith A. Labay
By
Mineral Resources Program, Geology, Energy & Minerals Science Center, Alaska Science Center, Geology, Geophysics, and Geochemistry Science Center

Data-driven prospectivity modelling of sediment-hosted Zn-Pb mineral systems and their critical raw materials

Demand for critical raw materials is expected to accelerate over the next few decades due to continued population growth and the shifting consumption patterns of the global economy. Sedimentary basins are important sources for critical raw materials and new discoveries of sediment–hosted Mississippi Valley–type (MVT) and/or clastic–dominated (CD) Zn–Pb deposits are likely required to mitigate futu
Authors
Christopher J. M. Lawley, Anne E. McCafferty, Garth E. Graham, David L. Huston, Karen D. Kelley, Karol Czarnota, Suzanne Paradis, Jan M. Peter, Nathan Hayward, Mike Barlow, Poul Emsbo, Joshua Aaron Coyan, Carma A. San Juan, Michael G. Gadd
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
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