To assure adequate uranium to supply electricity from nuclear power, the US Geological Survey is working to better understand the genetic controls, distribution, and quantities of domestic uranium. Because of the heavy reliance on imported uranium, scientists also lead international groups of uranium resource experts to monitor world uranium supply. This research benefits the mining industry, utilities, regulators, land owners, land managers, and supports the development of a carbon-free energy future for the United States.
RESEARCH AND UNDISCOVERED RESOURCE ASSESSMENTS
Targeted scientific research and geospatial assessments are the foundation for the successful exploration and development of uranium resources. The USGS uranium minerals systems project has completed assessments of two uranium regions, the Texas Coastal Plain and Southern High Plains (TX, NM, OK). In addition, the project has developed genetic deposit models for the southeastern US and Colorado Plateau that will aid in the location of additional domestic resources. These are published as peer reviewed articles, fact sheets and data releases, and presented to scientific and wider non-scientific audiences.
Genetic Deposit Models
Colorado Plateau Sandstone-hosted Uranium and Vanadium Deposit Model
The Colorado Plateau physiographic region is the largest uranium province in the United States, and one of the largest in the world. Uranium, often accompanied by vanadium, has been mined from the Plateau since the 1940’s, and the only actively operating domestic uranium mill is in this region. Since 2020 USGS has been compiling data, sampling known deposits, and analyzing samples throughout the Plateau. Last comprehensively studied in the 1980’s, this work has resulted in a new genetic deposit model that will benefit the identification of prospective regions.
Southeastern U.S. Metasomatite Uranium Deposit Model
Coles Hill is the largest unmined uranium deposit in the United States. Discovered in 1978, the deposit was enigmatic and complex, defying classification. USGS led a team of researchers that included expertise from the Virginia Museum of Natural History, Virginia Tech, and Virginia Uranium as well as USGS to develop the first comprehensive genetic model for Coles Hill, published in 2022. The new understandings developed by this model can be applied to future regional undiscovered resource assessments of metasomatite-type deposits in the southeastern US.
Undiscovered Uranium Resource Assessments
Southern High Plains (TX, NM, OK) Calcrete-type Deposit Model and Assessment
In 2016 USGS geologists located outcropping calcrete-hosted uranium mineralization in the Texas Panhandle. Ensuing studies of the mineralogy of the deposits, strontium and uranium isotopes, and groundwater modelling led to the development of the first genetic deposit model for calcrete-hosted uranium deposit in the US. This model was used to identify prospective tracts and was the basis of an assessment that was completed in 2017.
Texas Coastal Plain Sandstone-type Deposit Model and Assessment
Using GIS technology, multiple sources of data were combined to develop a comprehensive regional genetic model for sandstone-hosted uranium deposits in the Texas Coastal Plain region. The method of integrating data at a regional scale and at different intervals of geologic time, led to the identification of tracts that were prospective for additional uranium resources and an assessment completed in 2015.
Source: U.S. Geological Survey, August 2022
Links for additional information about uranium resources and production
US Energy Information Administration (http://www.eia.gov/nuclear/). Analysis and data describing the US domestic uranium and nuclear fuels industry.
USGS Mineral Resources on-line spatial data (https://mrdata.usgs.gov). Interactive maps and downloadable data for regional and global geology, geochemistry, and mineral resources including uranium.
National Geochemical Database (https://pubs.usgs.gov/of/1997/ofr-97-0492/). Downloadable hydrogeochemical and stream sediment data from the Department of Energy's National Uranium Resource Evaluation program, reformatted and now administered by the USGS.
US Environmental Protection Agency Uranium Mines and Mills Location Database (https://www.epa.gov/radiation/uranium-mines-and-mills-location-database-0) A compilation of uranium mine locations compiled by the EPA.
External Links
Organisation for Economic Cooperation and Development – Nuclear Energy Agency (http://www.oecd-nea.org/). Joint biennial publication with IAEA that summarizes world uranium resources, production, and demand.
International Atomic Energy Agency (www.iaea.org). Information about the nuclear fuel cycle.
World Nuclear Association (http://www.world-nuclear.org). Summary of world uranium production and demand and other data related to the generation of nuclear power.
Source/Usage: Photo by USGS geologist Bradley Van Gosen, Public Domain, Photo taken on 10/1/2021
Below are other science projects associated with this project.
Remote Sensing Techniques for Characterizing Energy Resources in Waste
Microanalysis of samples collected from sandstone-hosted uranium and vanadium deposits in the Colorado Plateau: Utah, New Mexico and Colorado, USA
Microanalysis of samples collected from the Sulfur Springs Draw calcrete-type uranium deposit in the Southern High Plains, Texas, USA
Whole rock geochemistry and comparative leachability of variably bleached and red sandstones of the Permian Cutler Formation, Mesa County, Colorado
U-Pb age determinations of uraninite by electron microprobe analyses of ore samples from two solution-collapse breccia pipe uranium deposits, Grand Canyon region, northwest Arizona, USA
Mineralogical analyses of drill core samples from the Canyon uranium-copper deposit, a solution-collapse breccia pipe, Grand Canyon area, Coconino County, Arizona, USA
Geochemical and mineralogical analyses of uranium ores from the Hack II and Pigeon deposits, solution-collapse breccia pipes, Grand Canyon region, Mohave and Coconino Counties, Arizona, USA
Geochemical and X-ray diffraction analyses of drill core samples from the Canyon uranium-copper deposit, a solution-collapse breccia pipe, Grand Canyon area, Coconino County, Arizona
Location, description, and whole rock geochemistry of rocks from the Coles Hill uranium deposit and vicinity, south-central Virginia
Historic groundwater quality of in situ recovery (ISR) uranium mines, Texas
Three GIS datasets defining areas permissive for the occurrence of uranium-bearing, solution-collapse breccia pipes in northern Arizona and southeast Utah
Below are publications associated with this project.
Focus areas for data acquisition for potential domestic resources of 13 critical minerals in the conterminous United States and Puerto Rico — Antimony, barite, beryllium, chromium, fluorspar, hafnium, helium, magnesium, manganese, potash, uranium, vanadiu
The Coles Hill uranium deposit, Virginia, USA: Geology, geochemistry, geochronology, and genetic model
Using fission-track radiography coupled with scanning electron microscopy for efficient identification of solid-phase uranium mineralogy at a former uranium pilot mill (Grand Junction, Colorado)
Calcrete uranium deposits in the Southern High Plains, USA
Assessment of undiscovered resources in calcrete uranium deposits, Southern High Plains region of Texas, New Mexico, and Oklahoma, 2017
The discovery and character of Pleistocene calcrete uranium deposits in the Southern High Plains of west Texas, United States
Geochemistry and hydrology of perched groundwater springs: assessing elevated uranium concentrations at Pigeon Spring relative to nearby Pigeon Mine, Arizona (USA)
Genetic and grade and tonnage models for sandstone-hosted roll-type uranium deposits, Texas Coastal Plain, USA
Natural thorium resources and recovery: Options and impacts
Thorium as a nuclear fuel
Assessment of undiscovered sandstone-hosted uranium resources in the Texas Coastal Plain, 2015
Persistent U(IV) and U(VI) following in-situ recovery (ISR) mining of a sandstone uranium deposit, Wyoming, USA
Below are news stories associated with this project.
- Overview
To assure adequate uranium to supply electricity from nuclear power, the US Geological Survey is working to better understand the genetic controls, distribution, and quantities of domestic uranium. Because of the heavy reliance on imported uranium, scientists also lead international groups of uranium resource experts to monitor world uranium supply. This research benefits the mining industry, utilities, regulators, land owners, land managers, and supports the development of a carbon-free energy future for the United States.
RESEARCH AND UNDISCOVERED RESOURCE ASSESSMENTS
Targeted scientific research and geospatial assessments are the foundation for the successful exploration and development of uranium resources. The USGS uranium minerals systems project has completed assessments of two uranium regions, the Texas Coastal Plain and Southern High Plains (TX, NM, OK). In addition, the project has developed genetic deposit models for the southeastern US and Colorado Plateau that will aid in the location of additional domestic resources. These are published as peer reviewed articles, fact sheets and data releases, and presented to scientific and wider non-scientific audiences.
Genetic Deposit Models
Colorado Plateau Sandstone-hosted Uranium and Vanadium Deposit Model
The Colorado Plateau physiographic region is the largest uranium province in the United States, and one of the largest in the world. Uranium, often accompanied by vanadium, has been mined from the Plateau since the 1940’s, and the only actively operating domestic uranium mill is in this region. Since 2020 USGS has been compiling data, sampling known deposits, and analyzing samples throughout the Plateau. Last comprehensively studied in the 1980’s, this work has resulted in a new genetic deposit model that will benefit the identification of prospective regions.Southeastern U.S. Metasomatite Uranium Deposit Model
Coles Hill is the largest unmined uranium deposit in the United States. Discovered in 1978, the deposit was enigmatic and complex, defying classification. USGS led a team of researchers that included expertise from the Virginia Museum of Natural History, Virginia Tech, and Virginia Uranium as well as USGS to develop the first comprehensive genetic model for Coles Hill, published in 2022. The new understandings developed by this model can be applied to future regional undiscovered resource assessments of metasomatite-type deposits in the southeastern US.Undiscovered Uranium Resource Assessments
USGS Geologist Bradley Van Gosen studying uranium mineralization in the Southern High Plains of Texas. Photo by USGS geologist Susan Hall, Public Domain. Photo taken 10/28/2015 Southern High Plains (TX, NM, OK) Calcrete-type Deposit Model and Assessment
In 2016 USGS geologists located outcropping calcrete-hosted uranium mineralization in the Texas Panhandle. Ensuing studies of the mineralogy of the deposits, strontium and uranium isotopes, and groundwater modelling led to the development of the first genetic deposit model for calcrete-hosted uranium deposit in the US. This model was used to identify prospective tracts and was the basis of an assessment that was completed in 2017.
Texas Coastal Plain Sandstone-type Deposit Model and Assessment
Using GIS technology, multiple sources of data were combined to develop a comprehensive regional genetic model for sandstone-hosted uranium deposits in the Texas Coastal Plain region. The method of integrating data at a regional scale and at different intervals of geologic time, led to the identification of tracts that were prospective for additional uranium resources and an assessment completed in 2015.Map of Uranium resource regions of the United States
Source: U.S. Geological Survey, August 2022Links for additional information about uranium resources and production
US Energy Information Administration (http://www.eia.gov/nuclear/). Analysis and data describing the US domestic uranium and nuclear fuels industry.
USGS Mineral Resources on-line spatial data (https://mrdata.usgs.gov). Interactive maps and downloadable data for regional and global geology, geochemistry, and mineral resources including uranium.
National Geochemical Database (https://pubs.usgs.gov/of/1997/ofr-97-0492/). Downloadable hydrogeochemical and stream sediment data from the Department of Energy's National Uranium Resource Evaluation program, reformatted and now administered by the USGS.
US Environmental Protection Agency Uranium Mines and Mills Location Database (https://www.epa.gov/radiation/uranium-mines-and-mills-location-database-0) A compilation of uranium mine locations compiled by the EPA.
External Links
Organisation for Economic Cooperation and Development – Nuclear Energy Agency (http://www.oecd-nea.org/). Joint biennial publication with IAEA that summarizes world uranium resources, production, and demand.
International Atomic Energy Agency (www.iaea.org). Information about the nuclear fuel cycle.
World Nuclear Association (http://www.world-nuclear.org). Summary of world uranium production and demand and other data related to the generation of nuclear power.
USGS Geologist Susan Hall studying bleached sandstone near uranium mineralizaiton, Colorado Plateau, UT
Source/Usage: Photo by USGS geologist Bradley Van Gosen, Public Domain, Photo taken on 10/1/2021Uranium mineralized drill core, Coles Hill deposit, Virginia. Susan Hall, USGS - Science
Below are other science projects associated with this project.
Remote Sensing Techniques for Characterizing Energy Resources in Waste
Funded by the USGS Energy Resource Program “Shark Tank” grant. The goal of this project is to develop a method to use remotely collected satellite and airborne data to ascertain the quantity and quality of waste at abandoned uranium mines to better estimate the resource potential, identify abandoned mines and explore potential applications to other energy resources. This is a collaborative effort... - Data
Microanalysis of samples collected from sandstone-hosted uranium and vanadium deposits in the Colorado Plateau: Utah, New Mexico and Colorado, USA
These data are microanalyses of 91 polished thin sections that were examined using a scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS) to identify minerals and observe their relationships at high magnification. Samples are from the Triassic Chinle and Jurassic Morrison Formations and adjacent units, which are the main hosts for sandstone-hosted uranium-vanadiMicroanalysis of samples collected from the Sulfur Springs Draw calcrete-type uranium deposit in the Southern High Plains, Texas, USA
This data release presents the results of microanalysis of 2 samples SSD15_01A (1 thin section and 1 composite chip sample), and SSD15_01B (1 thin section). The samples were collected in 2015 by U.S. Geological Survey geologists Bradley Van Gosen and Susan Hall from surface exposures of uranium mineralization in Sulfur Springs Draw, in Martin County, Texas (Van Gosen and Hall, 2017). The samples wWhole rock geochemistry and comparative leachability of variably bleached and red sandstones of the Permian Cutler Formation, Mesa County, Colorado
Forty samples of outcropping rock samples were collected from the Permian Cutler Formation exposed in the Sinbad Valley, Mesa County, Colorado by USGS volunteer Jon Thorson. This sample set includes 13 pairs of co-existing red unaltered and yellow-grey bleached sandstone. The decimal latitude and longitude locations of the sample collection sites are listed in the "All_Rock_Data" worksheet in theU-Pb age determinations of uraninite by electron microprobe analyses of ore samples from two solution-collapse breccia pipe uranium deposits, Grand Canyon region, northwest Arizona, USA
This data release compiles the electron microprobe spot analyses of U, Th, and Pb concentrations in uraninite (U oxide) particles, and corresponding calculated age determinations, measured in samples of ore from two uranium-copper breccia pipe ore bodies, the Canyon (Pinyon Plain) and Hack II deposits. The U-rich samples that were analyzed typify the deposits hosted by solution-collapse breccia piMineralogical analyses of drill core samples from the Canyon uranium-copper deposit, a solution-collapse breccia pipe, Grand Canyon area, Coconino County, Arizona, USA
This data release compiles the X-ray diffraction and electron microscopy analyses of drill core samples collected by the U.S. Geological Survey that were selected to typify the uranium-copper ore bodies of the Canyon deposit. The deposit is hosted by a solution-collapse breccia pipe, in which mineralization exists from about 650 to 2,100 ft (200 to 640 m) below the surface (Mathisen and others, 20Geochemical and mineralogical analyses of uranium ores from the Hack II and Pigeon deposits, solution-collapse breccia pipes, Grand Canyon region, Mohave and Coconino Counties, Arizona, USA
This data release compiles the whole-rock geochemistry, X-ray diffraction, and electron microscopy analyses of samples collected from the uranium ore bodies of two mined-out deposits in the Grand Canyon region of northwestern Arizona - the Hack II and Pigeon deposits. The samples are grab samples of ore collected underground at each mine by the U.S. Geological Survey (USGS) during the mid-1980s, wGeochemical and X-ray diffraction analyses of drill core samples from the Canyon uranium-copper deposit, a solution-collapse breccia pipe, Grand Canyon area, Coconino County, Arizona
This data release compiles the major and trace element analytical results of drill core samples that typify the uranium-copper ore bodies of the Canyon deposit, located about 6.1 miles (10 km) south-southeast of Tusayan, Arizona. The Canyon deposit lies from about 750 to 2,000 ft (230 to 610 m) below the surface at latitude 35.88333 North, longitude -112.09583 West (datum WGS 1984). Energy Fuels,Location, description, and whole rock geochemistry of rocks from the Coles Hill uranium deposit and vicinity, south-central Virginia
Major-element and trace-element concentrations in 76 core samples and seven surface samples of rocks from the Coles Hill uranium deposit and vicinity, Pittsylvania County, south-central Virginia are presented as tabular digital data. The Coles Hill deposit is the largest unmined uranium deposit in the United States. The data were collected to 1) characterize the chemistry of variably uranium-minerHistoric groundwater quality of in situ recovery (ISR) uranium mines, Texas
In situ recovery (ISR) uranium mining is a technique in which uranium is extracted by a series of injection and recovery wells developed in a permeable sandstone host rock. Chemical constituents (lixiviants) are added to groundwater injection wells to mobilize uranium into groundwater. Before mining, baseline water quality is measured by sampling groundwater from the aquifer intended to be mined aThree GIS datasets defining areas permissive for the occurrence of uranium-bearing, solution-collapse breccia pipes in northern Arizona and southeast Utah
Some of the highest grade uranium (U) deposits in the United States are hosted by solution-collapse breccia pipes in the Grand Canyon region of northern Arizona. These structures are named for their vertical, pipe-like shape and the broken rock (breccia) that fills them. Hundreds, perhaps thousands, of these structures exist. Not all of the breccia pipes are mineralized; only a small percentage o - Multimedia
- Publications
Below are publications associated with this project.
Filter Total Items: 37Focus areas for data acquisition for potential domestic resources of 13 critical minerals in the conterminous United States and Puerto Rico — Antimony, barite, beryllium, chromium, fluorspar, hafnium, helium, magnesium, manganese, potash, uranium, vanadiu
The Earth Mapping Resources Initiative (Earth MRI) is conducted in phases to identify areas for acquiring new geologic framework data to identify potential domestic resources of the 35 mineral materials designated as critical minerals for the United States. This report describes the data sources and summary results for 13 critical minerals evaluated in the conterminous United States and Puerto RicThe Coles Hill uranium deposit, Virginia, USA: Geology, geochemistry, geochronology, and genetic model
The Coles Hill uranium deposit with an indicated resource of about 130 million lbs. of U3O8 is the largest unmined uranium deposit in the United States. The deposit is hosted in the Taconian (approximately 480 – 450 Ma) Martinsville igneous complex, which consists of the Ordovician Leatherwood Granite (granodiorite) and Silurian Rich Acres Formation (diorite). The host rock was metamorphosed to orUsing fission-track radiography coupled with scanning electron microscopy for efficient identification of solid-phase uranium mineralogy at a former uranium pilot mill (Grand Junction, Colorado)
At a former uranium pilot mill in Grand Junction, Colorado, mine tailings and some subpile sediments were excavated to various depths to meet surface radiological standards, but residual solid-phase uranium below these excavation depths still occurs at concentrations above background. The combination of fission-track radiography and scanning electron microscope energy-dispersive X-ray spectroscopyCalcrete uranium deposits in the Southern High Plains, USA
The Southern High Plains (SHP) is a new and emerging U.S. uranium province. Here, uranyl vanadates form deposits in Pliocene to Pleistocene sandstone, dolomite, and limestone. Fifteen calcrete uranium occurrences are identified; two of these, the Buzzard Draw and Sulfur Springs Draw deposits, have combined in-place resources estimated at about 4 million pounds of U3O8. Ore minerals carnotite and fAssessment of undiscovered resources in calcrete uranium deposits, Southern High Plains region of Texas, New Mexico, and Oklahoma, 2017
The U.S. Geological Survey estimates a mean of 40 million pounds of in-place uranium oxide (U3O8) remaining as potential undiscovered resources in the Southern High Plains region of Texas, New Mexico, and Oklahoma. This estimate used a geology-based assessment method specific to calcrete uranium deposits.The discovery and character of Pleistocene calcrete uranium deposits in the Southern High Plains of west Texas, United States
This report describes the discovery and geology of two near-surface uranium deposits within calcareous lacustrine strata of Pleistocene age in west Texas, United States. Calcrete uranium deposits have not been previously reported in the United States. The west Texas uranium deposits share characteristics with some calcrete uranium deposits in Western Australia—uranium-vanadium minerals hosted by nGeochemistry and hydrology of perched groundwater springs: assessing elevated uranium concentrations at Pigeon Spring relative to nearby Pigeon Mine, Arizona (USA)
The processes that affect water chemistry as the water flows from recharge areas through breccia-pipe uranium deposits in the Grand Canyon region of the southwestern United States are not well understood. Pigeon Spring had elevated uranium in 1982 (44 μg/L), compared to other perched springs (2.7–18 μg/L), prior to mining operations at the nearby Pigeon Mine. Perched groundwater springs in an areaGenetic and grade and tonnage models for sandstone-hosted roll-type uranium deposits, Texas Coastal Plain, USA
The coincidence of a number of geologic and climatic factors combined to create conditions favorable for the development of mineable concentrations of uranium hosted by Eocene through Pliocene sandstones in the Texas Coastal Plain. Here 254 uranium occurrences, including 169 deposits, 73 prospects, 6 showings and 4 anomalies, have been identified. About 80 million pounds of U3O8 have been producedNatural thorium resources and recovery: Options and impacts
This paper reviews the front end of the thorium fuel cycle, including the extent and variety of thorium deposits, the potential sources of thorium production, and the physical and chemical technologies required to isolate and purify thorium. Thorium is frequently found within rare earth element–bearing minerals that exist in diverse types of mineral deposits, often in conjunction with other mineraThorium as a nuclear fuel
No abstract available.Assessment of undiscovered sandstone-hosted uranium resources in the Texas Coastal Plain, 2015
The U.S. Geological Survey estimated a mean of 220 million pounds of recoverable uranium oxide (U3O8 ) remaining as potential undiscovered resources in southern Texas. This estimate used a geology-based assessment method for Tertiary sandstone-hosted uranium deposits in the Texas Coastal Plain sedimentary strata (fig.1).Persistent U(IV) and U(VI) following in-situ recovery (ISR) mining of a sandstone uranium deposit, Wyoming, USA
Drill-core samples from a sandstone-hosted uranium (U) deposit in Wyoming were characterized to determine the abundance and distribution of uranium following in-situ recovery (ISR) mining with oxygen- and carbon dioxide-enriched water. Concentrations of uranium, collected from ten depth intervals, ranged from 5 to 1920 ppm. A composite sample contained 750 ppm uranium with an average oxidation st - News
Below are news stories associated with this project.