This polygon shapefile presents ranges of ground surface exposure rate from excess Bismuth 214 in counts per second based upon the 1764keV photopeak. Excess Bismuth 214 is based upon measured minus expected Bismuth 214 times a per flight determined constant equal to a ratio of statistically most likely values. Forty one (41) aerial radiological surveys of potential uranium mining areas (1,144 square miles) were conducted within the Navajo Nation during the period from October 1994 through October 1999. The US Environmental Protection Agency (USEPA) Region 9 funded the surveys and the US Department of Energy (USDOE) Remote Sensing Laboratory (RSL) in Las Vegas, Nevada conducted the aerial surveys. The aerial survey data were used to characterize the overall radioactivity (ground surface exposure rate) and excess Bismuth 214 levels within the surveyed areas.

This line shapefile provides iso-contours of excess Bismuth 214 in counts per second based upon the 1764keV photopeak. Excess Bismuth 214 is based upon measured minus expected Bismuth 214 times a per flight determined constant equal to a ratio of statistically most likely values. Forty one (41) aerial radiological surveys of potential uranium mining areas (1,144 square miles) were conducted within the Navajo Nation during the period from October 1994 through October 1999. The US Environmental Protection Agency (USEPA) Region 9 funded the surveys and the US Department of Energy (USDOE) Remote Sensing Laboratory (RSL) in Las Vegas, Nevada conducted the aerial surveys. The aerial survey data were used to characterize the overall radioactivity (ground surface exposure rate) and excess Bismuth 214 levels within the surveyed areas.

This polygon shapefile presents ranges of ground surface exposure rate from total terrestrial gamma activity, and calculated from aerial gross count data (all gamma events in the range of 38-3026 keV). Forty one (41) aerial radiological surveys of potential uranium mining areas (1,144 square miles) were conducted within the Navajo Nation during the period from October 1994 through October 1999. The US Environmental Protection Agency (USEPA) Region 9 funded the surveys and the US Department of Energy (USDOE) Remote Sensing Laboratory (RSL) in Las Vegas, Nevada conducted the aerial surveys. The aerial survey data were used to characterize the overall radioactivity (ground surface exposure rate) and excess Bismuth 214 levels within the surveyed areas.

This polygon shapefile documents the extent of the aerial radiological surveys of 41 potential uranium mining areas (1,144 square miles) within the Navajo Nation that were conducted during the period from October 1994 through October 1999. The US Environmental Protection Agency (USEPA) Region 9 funded the surveys and the US Department of Energy (USDOE) Remote Sensing Laboratory (RSL) in Las Vegas, Nevada conducted the aerial surveys. The aerial survey data were used to characterize the overall radioactivity and excess Bismuth 214 levels within the surveyed areas. Bismuth 214 is an indicator of uranium ore deposits and/or uranium mines. Fourteen attributes about each survey are included.

This map service contains data from aerial radiological surveys of 41 potential uranium mining areas (1,144 square miles) within the Navajo Nation that were conducted during the period from October 1994 through October 1999. The US Environmental Protection Agency (USEPA) Region 9 funded the surveys and the US Department of Energy (USDOE) Remote Sensing Laboratory (RSL) in Las Vegas, Nevada conducted the aerial surveys. The aerial survey data were used to characterize the overall radioactivity and excess Bismuth 214 levels within the surveyed areas. This US EPA Region 9 web service contains the following map layers: Total Terrestrial Gamma Activity Polygons, Total Terrestrial Gamma Activity Contours, Excess Bismuth 214 Contours, Excess Bismuth 214 Polygons, Flight Areas Full FGDC metadata records for each layer can be found by clicking the layer name at the web service endpoint and viewing the layer description. Security Classification: Public. Access Constraints: None. Use Constraints: None. Please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of the EPA would be appreciated.

This GIS dataset contains polygon features that represent all Abandoned Uranium Mines (AUMs) on or within one mile of the Navajo Nation. Attributes include mine names, aliases, Potentially Responsible Parties, reclamation status, EPA mine status, links to AUM reports, and the region in which an AUM is located. This dataset contains 608 features. As of June 2021, Phase 2 Trust mines were updated.

This GIS dataset contains polygon features representing the boundaries of the six Abandoned Uranium Mines (AUM) Regions, including: Central, Eastern, Northern, North Central, Southern, and Western Regions. These regions comprise the parts of the Navajo Nation where abandoned uranium mines are located and does not encompass the entire Navajo Nation. Each AUM Region is comprised of many Chapters. Each included Chapter has at least one AUM within its boundaries.

The data represent sediment depth profiles of gamma-emitting radionuclides and major, minor, and trace elements in native soil locations around four mineralized sites in Mohave County, Arizona. The four sites represent breccia pipe uranium deposits in the Grand Canyon Region in various lifecycle stages of mining: EZ2 complex (exploration), Arizona 1 mine (standby), Pinenut mine (closed, pre-reclamation), and Kanab North Mine (reclaimed). Gamma spectroscopy determinations were made using high-purity germanium well detectors for analysis of cesium-137 (Cs-137), lead-210 (Pb-210), lead-214 (Pb-214), and bismuth-214 (Bi-214). Major, minor, and trace element determinations were made for using inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP-OES) for analysis of aluminum (Al), calcium (Ca), iron (Fe), potassium (K), magnesium (Mg), sodium (Na), phosphorus (P), sulfur (S), titanium (Ti), silver (Ag), arsenic (As), barium (Ba), beryllium (Be), bismuth (Bi), cadmium (Cd), cerium (Ce), cobalt (Co), chromium (Cr), cesium (Cs), copper (Cu), gallium (Ga), hafnium (Hf), indium (In), lanthanum (La), lithium (Li), lutetium (Lu), manganese (Mn), molybdenum (Mo), niobium (Nb), nickel (Ni), lead (Pb), rubidium (Rb), antimony (Sb), scandium (Sc), selenium (Se), tin (Sn), strontium (Sr), tantalum (Ta), terbium (Tb), tellurium (Te), thorium (Th), thallium (Tl), uranium (U), vanadium (V), tungsten (W), yttrium (Y), ytterbium (Yb), zinc (Zn), and zirconium (Zr). The data were collected to assess the potential of fallout radionuclides (Cs-137 and unsupported Pb-210) to help understand the distribution of subsurface contaminants related to mining activity. The Pb-210, Pb-214, and Bi-214 data can be used to calculate Ra-226 and unsupported Pb-210.

The data represent sediment depth profiles of gamma-emitting radionuclides cesium-137 (Cs-137), lead-210 (Pb-210), lead-214 (Pb-214), and bismuth-214 (Bi-214) in native soil locations around four mineralized sites in Mohave County, Arizona. The four sites represent breccia pipe uranium deposits in the Grand Canyon Region in various lifecycle stages of mining: EZ2 complex (exploration), Arizona 1 mine (standby), Pinenut mine (closed, pre-reclamation), and Kanab North Mine (reclaimed). The data were collected to assess the potential of fallout radionuclides (Cs-137 and unsupported Pb-210) to help understand the distribution of subsurface contaminants related to mining activity. Gamma spectroscopy determinations were performed on archive samples from November 2018 that were collected during a previous investigation, which is cited below. The Pb-210, Pb-214, and Bi-214 data can be used to calculate Ra-226 and excess (unsupported) Pb-210. Additional information about the collection of sediment cores and soil-profile measurements can be found in Kauble, R.K., Andraski, B.J., Green, C.T., and Walton-Day, K., 2021, Soil sample data for four uranium mine sites, Mohave County, Arizona, April and November 2018: U.S. Geological Survey data release, https://doi.org/10.5066/P9B8I7KC.

The data represent sediment depth profiles of gamma-emitting radionuclides cesium-137 (Cs-137), lead-210 (Pb-210), lead-214 (Pb-214), and bismuth-214 (Bi-214) in native soil locations around four mineralized sites in Mohave County, Arizona. The four sites represent breccia pipe uranium deposits in the Grand Canyon Region in various lifecycle stages of mining: EZ2 complex (exploration), Arizona 1 mine (standby), Pinenut mine (closed, pre-reclamation), and Kanab North Mine (reclaimed). The data were collected to assess the potential of fallout radionuclides (Cs-137 and unsupported Pb-210) to help understand the distribution of subsurface contaminants related to mining activity. Gamma spectroscopy determinations were performed on archive samples from November 2018 that were collected during a previous investigation, which is cited below. The Pb-210, Pb-214, and Bi-214 data can be used to calculate Ra-226 and excess (unsupported) Pb-210. Additional information about the collection of sediment cores and soil-profile measurements can be found in Kauble, R.K., Andraski, B.J., Green, C.T., and Walton-Day, K., 2021, Soil sample data for four uranium mine sites, Mohave County, Arizona, April and November 2018: U.S. Geological Survey data release, https://doi.org/10.5066/P9B8I7KC.