Richard Wanty (Former Employee)
Science and Products
Screening Techniques for Legacy Mine Land (LML) Sites Using Data Mining and Site-specific Studies in the Western U.S.
The main goal of this project is to provide a science-based approach for screening legacy mine land (LML) sites for remediation and identifying watersheds where relatively low-cost restoration efforts may yield substantial improvements to stream water quality. We are combing analysis of multiple existing regional data coverages with focused field studies to develop a protocol that land managers...
GIS data and scripts for Colorado Legacy Mine Lands Watershed Delineation and Scoring tool (WaDeS)
This data release includes GIS datasets supporting the Colorado Legacy Mine Lands Watershed Delineation and Scoring tool (WaDeS), a web mapping application available at https://geonarrative.usgs.gov/colmlwades/. Water chemistry data were compiled from the U.S. Geological Survey (USGS) National Water Information System (NWIS), U.S. Environmental Protection Agency (EPA) STORET database...
Chemistry and Flow Data from Headwater Streams Draining Hydrothermally Altered Areas in Colorado
This U.S. Geological Survey (USGS) data release contains stream water chemistry and streamflow data collected in late August and early September, 2021 from 28 sites located throughout Colorado, USA. The sampled streams all drain high-elevation mountain watersheds in areas where the bedrock is hydrothermally altered and contains abundant sulfide minerals. Most sampled streams are...
Geochemistry and Environmental Tracer Data for Groundwater, Stream Water, and Soil and Sediment from North Quartz Creek, Colorado
This U.S. Geological Survey (USGS) data release contains data from stream water, groundwater, and soil samples collected in 2019 and 2020 in the North Quartz Creek watershed in central Colorado. Fourteen streambank wells were installed in pairs at seven locations in August 2020 to capture the emerging groundwater from the left bank and right banks (relative to downstream-facing direction...
Trace metals in water and biota in and near headwater streams in the Colorado Mineral Belt
This data release includes sampling location data, field-collected water chemistry data, cation and anion concentration data for water and tissues of submerged aquatic vegetation, aquatic insect larvae, adult aquatic insects and riparian spiders from 35 first- and second-order sub-alpine streams that ranged over several orders of magnitude in metal concentrations but were similar in...
Geochemical analyses of surface water, groundwater and springs surrounding Mount Emmons near Crested Butte, Colorado (ver. 2.0, September 2020)
The U.S. Geological Survey (USGS), Colorado Division of Reclamation, Mining and Safety (DRMS), and Coal Creek Watershed Coalition (CCWC) working independently, have intermittently collected samples of surface- and groundwater and springs around Mount Emmons, near Crested Butte, Colorado. This data release is a compilation of the comprehensive inorganic chemical analyses conducted as a...
Environmental tracer data from surface water and groundwater samples collected in Redwell Basin near Crested Butte, Colorado, 2017-2019
This dataset contains environmental tracer data from surface water and groundwater samples collected by the U.S. Geological Survey in Redwell Basin, an alpine watershed in the Elk Mountains near the town of Crested Butte, Colorado. The basin is underlain by interbedded shale and sandstone that have been variably hydrothermally altered and silicified by local magmatic intrusions. Samples...
Geochemistry and Environmental Tracer Data for Groundwater, Stream Water, and Ferricrete Samples from Handcart Gulch, Colorado
This data release is part of a study examining the use of near-stream groundwater discharge as a tool for Geochemical Exploration. Handcart Gulch is an unmined alpine watershed in Montezuma Mining District in the Colorado Front Range. The streambed is cemented by deep ferricrete deposits. Stream water, groundwater, and ferricrete samples were collected and analyzed to constrain the...
Maps showing hydrostatic levels and general ground-water quality for an area near Conifer, Colorado
Static water levels (SWL's) were measured in more than one hundred wells in the study area during April-May 1989. The water levels were monitored for 10-15 minutes to determine if they were static. If a given level was found not to be static, the measurement was repeated at a later data when the level was static.
Filter Total Items: 113
Incorporating streambank wells in stream mass loading studies to more effectively identify sources of solutes in stream water
Stream synoptic sampling studies that include flow estimates derived from the stream tracer dilution method are now commonly performed to identify sources and processes controlling solute transport to streams. However, a limitation of this mass-loading approach is its inability to identify the side of the stream on which a source is located in the common case where loading is largely...
Authors
Andrew H. Manning, Robert L. Runkel, Jean Morrison, Richard Wanty, Katherine Walton-Day
Regional occurrence of aqueous tungsten and relations with antimony, arsenic and molybdenum concentrations (Sardinia, Italy)
Tungsten (W) is rarely found in natural waters, yet it can be introduced into the food chain and cause potentially toxic effects. Uptake of W by plants and vegetables, or trace presence of W in drinking water are possible vectors for ingestion of W by humans. The latter is recognized as a possible cause of lymphatic leukemia. Increased uses of W might result in a degradation of water...
Authors
Rosa Cidu, Riccardo Biddau, Franco Frau, Richard Wanty, Stefano Naitza
Variation in metal concentrations across a large contamination gradient is reflected in stream but not linked riparian food webs
Aquatic insects link food web dynamics across freshwater-terrestrial boundaries and subsidize terrestrial consumer populations. Contaminants that accumulate in larval aquatic insects and are retained across metamorphosis can increase dietary exposure for riparian insectivores. To better understand potential exposure of terrestrial insectivores to aquatically-derived trace metals, metal...
Authors
Johanna M. Kraus, Richard Wanty, Travis S. Schmidt, David Walters, Ruth E. Wolf
Direct observation of the depth of active groundwater circulation in an alpine watershed
The depth of active groundwater circulation is a fundamental control on stream flows and chemistry in mountain watersheds, yet it remains challenging to characterize and is rarely well constrained. We collected hydraulic conductivity, hydraulic head, temperature, chemical, noble gas, and 3H/3He groundwater age data from discrete levels in two boreholes 46 and 81 m deep in an alpine...
Authors
Andrew H. Manning, Lyndsay B. Ball, Richard Wanty, Kenneth H. Williams
Using stream-side groundwater discharge for geochemical exploration in mountainous terrain
Groundwater chemistry has been predominantly used in geochemical exploration studies to identify mineralized targets concealed under transported cover in areas with gentle topography. Another potentially valuable ap-plication that has received little attention is using groundwater chemistry to identify deposits concealed within mountain ridges. A number of geochemical exploration studies...
Authors
Andrew H. Manning, Jean Morrison, Richard Wanty, Christopher T. Mills
A 20-year record of water chemistry in an alpine setting, Mount Emmons, Colorado, USA
From 1997 to the present, the U.S. Geological Survey and other agencies have been collecting water samples for chemical analyses on Mount Emmons in central Colorado, USA. The geology of Mount Emmons is dominated by Upper Cretaceous to Paleogene sediments of marine to continental origin, with felsic intrusive rocks interrupting the sedimentary block. Extensive sulphide-rich alteration...
Authors
Richard Wanty, Andrew H. Manning, Michaela Johnson, Philip Verplanck
Aluminum mobility in mildly acidic mine drainage: Interactions between hydrobasaluminite, silica and trace metals from the nano to the meso-scale
Aluminum precipitates control the hydrochemistry and mineralogy of a broad variety of environments on Earth (e.g., acid mine drainage, AMD, coastal wetlands, boreal and alpine streams, tropical acid sulfate soils, laterites and bauxites, …). However, the geochemical and mineralogical processes controlling Al (and other associated metals and metalloids) transport and removal in those...
Authors
Manuel A. Caraballo, Richard Wanty, Philip Verplanck, Leonardo Navarro-Valdivia, Carlos Ayora, Michael Hochella
Application of hydrologic-tracer techniques to the Casargiu adit and Rio Irvi (SW-Sardinia, Italy): Using enhanced natural attenuation to reduce extreme metal loads
Hydrologic tracer techniques were applied to Rio Irvi (SW Sardinia), a stream affected by mine drainage, allowing the calculation of stream discharge and metal loads and comparison to other streams. The calculated discharge showed a continuous increase from near 21.2 L/s to 29.1 L/s. Cumulative loads of mine-related constituents, including the Casargiu adit inflow, were large, with more...
Authors
Giovanni De Giudici, Daniela Medas, Rosa Cidu, Pierfranco Lattanzi, Francesca Podda, Franco Frau, Nicola Rigonat, Claudia Pusceddu, Stefania Da Pelo, Patrizia Onnis, Pier Andrea Marras, Richard B. Wanty, Briant A. Kimball
Isotopic insights into biological regulation of zinc in contaminated systems
Aquatic organisms use a variety of biogeochemical reactions to regulate essential and non-essential trace metals. Many of these mechanisms can lead to isotopic fractionation, thus measurement of metal isotopes may yield insights into the processes by which organisms respond to metal exposure. We illustrate these concepts with two case studies, one involving an intra- and the other an...
Authors
Richard B. Wanty, Laurie S. Balistrieri, Jeff S. Wesner, David Walters, Travis S. Schmidt, Francesca Podda, G. De Giudici, Craig A. Stricker, Johanna M. Kraus, Pierfranco Lattanzi, Ruth E. Wolf, R. Cidu
Contrasting distributions of groundwater arsenic and uranium in the western Hetao basin, Inner Mongolia: Implication for origins and fate controls
Although As concentrations have been investigated in shallow groundwater from the Hetao basin, China, less is known about U and As distributions in deep groundwater, which would help to better understand their origins and fate controls. Two hundred and ninety-nine groundwater samples, 122 sediment samples, and 14 rock samples were taken from the northwest portion of the Hetao basin, and...
Authors
Huaming Guo, Yongfeng Jia, Richard B. Wanty, Yuxiao Jiang, Weiguang Zhao, Wei Xiu, Jiaxing Shen, Yuan Li, Yongsheng Cao, Yang Wu, Di Zhang, Chao Wei, Yilong Zhang, Wengeng Cao, Andrea L. Foster
Aquatic pollution increases use of terrestrial prey subsidies by stream fish
Stream food webs are connected with their riparian zones through cross-ecosystem movements of energy and nutrients. The use and impact of terrestrial subsidies on aquatic consumers is determined in part by in situ biomass of aquatic prey. Thus, stressors such as aquatic pollutants that greatly reduce aquatic secondary production could increase the need for and reliance of stream...
Authors
Johanna M. Kraus, Justin F. Pomeranz, Andrew S. Todd, David M. Walters, Travis S. Schmidt, Richard B. Wanty
Environmental effects on the aquatic system and metal discharge to the Mediterranean Sea from a near-neutral zinc-ferrous sulfate mine drainage
After mine closure in the 1980s and subsequent shutdown of the dewatering system, groundwater rebound led to drainage outflow from the Casargiu gallery (Montevecchio mine, SW Sardinia, Italy) beginning in 1997. Mine drainage had pH 6.0 and dissolved concentrations of sulfate (5000 mg/L) and metals (e.g., 1000 mg/L Zn, 230 mg/L Fe, 150 mg/L Mn) much higher than those previously measured...
Authors
Franco Frau, Daniela Medas, Stefania Da Pelo, Richard B. Wanty, Rosa Cidu
Non-USGS Publications**
Wanty, Richard B., 1986, Geochemistry of vanadium in an epigenetic sandstone-hosted vanadium-uranium deposit, Henry basin, Utah: Ph.D. Dissertation, Colorado School of Mines, 198 pp.
Wanty, Richard B., 1981, The use of radiogenic elements, and selected trace elements and their solution-mineral equilibria in groundwater as exploration tools for uranium deposits: M.S. Thesis, Colorado School of Mines, 151 pp.
Wanty, R.B., Langmuir, D., and Chatham, J.R., 1981, Groundwater prospecting for sandstone-type uranium deposits: The merits of mineral-solution equilibria versus single element tracer methods: U.S. Department of Energy, Grand Junction Office Report GJO-79-360-E, v. 2, 91 pp.
Chatham, J.R., Wanty, R.B., and Langmuir, D., 1981, National Uranium Resource Evaluation. Groundwater prospecting for sandstone-type uranium deposits: the merits of mineral-solution equilibria versus single element tracer methods. Final Report: U.S. Department of Energy, Grand Junction Office Report GJO-79-360-E, 197 pp.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Colorado Legacy Mine Lands Watershed Delineation and Scoring tool (WaDeS)
This web application, a summarized compilation of central Colorado water chemistry datasets from USGS and EPA, identifies legacy mine sites within the headwaters of central Colorado that could be good candidates for future remediation work based on stream metal concentrations, the number and complexity of mine features, and the potential for high natural background metal concentrations.
Science and Products
Screening Techniques for Legacy Mine Land (LML) Sites Using Data Mining and Site-specific Studies in the Western U.S.
The main goal of this project is to provide a science-based approach for screening legacy mine land (LML) sites for remediation and identifying watersheds where relatively low-cost restoration efforts may yield substantial improvements to stream water quality. We are combing analysis of multiple existing regional data coverages with focused field studies to develop a protocol that land managers...
GIS data and scripts for Colorado Legacy Mine Lands Watershed Delineation and Scoring tool (WaDeS)
This data release includes GIS datasets supporting the Colorado Legacy Mine Lands Watershed Delineation and Scoring tool (WaDeS), a web mapping application available at https://geonarrative.usgs.gov/colmlwades/. Water chemistry data were compiled from the U.S. Geological Survey (USGS) National Water Information System (NWIS), U.S. Environmental Protection Agency (EPA) STORET database...
Chemistry and Flow Data from Headwater Streams Draining Hydrothermally Altered Areas in Colorado
This U.S. Geological Survey (USGS) data release contains stream water chemistry and streamflow data collected in late August and early September, 2021 from 28 sites located throughout Colorado, USA. The sampled streams all drain high-elevation mountain watersheds in areas where the bedrock is hydrothermally altered and contains abundant sulfide minerals. Most sampled streams are...
Geochemistry and Environmental Tracer Data for Groundwater, Stream Water, and Soil and Sediment from North Quartz Creek, Colorado
This U.S. Geological Survey (USGS) data release contains data from stream water, groundwater, and soil samples collected in 2019 and 2020 in the North Quartz Creek watershed in central Colorado. Fourteen streambank wells were installed in pairs at seven locations in August 2020 to capture the emerging groundwater from the left bank and right banks (relative to downstream-facing direction...
Trace metals in water and biota in and near headwater streams in the Colorado Mineral Belt
This data release includes sampling location data, field-collected water chemistry data, cation and anion concentration data for water and tissues of submerged aquatic vegetation, aquatic insect larvae, adult aquatic insects and riparian spiders from 35 first- and second-order sub-alpine streams that ranged over several orders of magnitude in metal concentrations but were similar in...
Geochemical analyses of surface water, groundwater and springs surrounding Mount Emmons near Crested Butte, Colorado (ver. 2.0, September 2020)
The U.S. Geological Survey (USGS), Colorado Division of Reclamation, Mining and Safety (DRMS), and Coal Creek Watershed Coalition (CCWC) working independently, have intermittently collected samples of surface- and groundwater and springs around Mount Emmons, near Crested Butte, Colorado. This data release is a compilation of the comprehensive inorganic chemical analyses conducted as a...
Environmental tracer data from surface water and groundwater samples collected in Redwell Basin near Crested Butte, Colorado, 2017-2019
This dataset contains environmental tracer data from surface water and groundwater samples collected by the U.S. Geological Survey in Redwell Basin, an alpine watershed in the Elk Mountains near the town of Crested Butte, Colorado. The basin is underlain by interbedded shale and sandstone that have been variably hydrothermally altered and silicified by local magmatic intrusions. Samples...
Geochemistry and Environmental Tracer Data for Groundwater, Stream Water, and Ferricrete Samples from Handcart Gulch, Colorado
This data release is part of a study examining the use of near-stream groundwater discharge as a tool for Geochemical Exploration. Handcart Gulch is an unmined alpine watershed in Montezuma Mining District in the Colorado Front Range. The streambed is cemented by deep ferricrete deposits. Stream water, groundwater, and ferricrete samples were collected and analyzed to constrain the...
Maps showing hydrostatic levels and general ground-water quality for an area near Conifer, Colorado
Static water levels (SWL's) were measured in more than one hundred wells in the study area during April-May 1989. The water levels were monitored for 10-15 minutes to determine if they were static. If a given level was found not to be static, the measurement was repeated at a later data when the level was static.
Filter Total Items: 113
Incorporating streambank wells in stream mass loading studies to more effectively identify sources of solutes in stream water
Stream synoptic sampling studies that include flow estimates derived from the stream tracer dilution method are now commonly performed to identify sources and processes controlling solute transport to streams. However, a limitation of this mass-loading approach is its inability to identify the side of the stream on which a source is located in the common case where loading is largely...
Authors
Andrew H. Manning, Robert L. Runkel, Jean Morrison, Richard Wanty, Katherine Walton-Day
Regional occurrence of aqueous tungsten and relations with antimony, arsenic and molybdenum concentrations (Sardinia, Italy)
Tungsten (W) is rarely found in natural waters, yet it can be introduced into the food chain and cause potentially toxic effects. Uptake of W by plants and vegetables, or trace presence of W in drinking water are possible vectors for ingestion of W by humans. The latter is recognized as a possible cause of lymphatic leukemia. Increased uses of W might result in a degradation of water...
Authors
Rosa Cidu, Riccardo Biddau, Franco Frau, Richard Wanty, Stefano Naitza
Variation in metal concentrations across a large contamination gradient is reflected in stream but not linked riparian food webs
Aquatic insects link food web dynamics across freshwater-terrestrial boundaries and subsidize terrestrial consumer populations. Contaminants that accumulate in larval aquatic insects and are retained across metamorphosis can increase dietary exposure for riparian insectivores. To better understand potential exposure of terrestrial insectivores to aquatically-derived trace metals, metal...
Authors
Johanna M. Kraus, Richard Wanty, Travis S. Schmidt, David Walters, Ruth E. Wolf
Direct observation of the depth of active groundwater circulation in an alpine watershed
The depth of active groundwater circulation is a fundamental control on stream flows and chemistry in mountain watersheds, yet it remains challenging to characterize and is rarely well constrained. We collected hydraulic conductivity, hydraulic head, temperature, chemical, noble gas, and 3H/3He groundwater age data from discrete levels in two boreholes 46 and 81 m deep in an alpine...
Authors
Andrew H. Manning, Lyndsay B. Ball, Richard Wanty, Kenneth H. Williams
Using stream-side groundwater discharge for geochemical exploration in mountainous terrain
Groundwater chemistry has been predominantly used in geochemical exploration studies to identify mineralized targets concealed under transported cover in areas with gentle topography. Another potentially valuable ap-plication that has received little attention is using groundwater chemistry to identify deposits concealed within mountain ridges. A number of geochemical exploration studies...
Authors
Andrew H. Manning, Jean Morrison, Richard Wanty, Christopher T. Mills
A 20-year record of water chemistry in an alpine setting, Mount Emmons, Colorado, USA
From 1997 to the present, the U.S. Geological Survey and other agencies have been collecting water samples for chemical analyses on Mount Emmons in central Colorado, USA. The geology of Mount Emmons is dominated by Upper Cretaceous to Paleogene sediments of marine to continental origin, with felsic intrusive rocks interrupting the sedimentary block. Extensive sulphide-rich alteration...
Authors
Richard Wanty, Andrew H. Manning, Michaela Johnson, Philip Verplanck
Aluminum mobility in mildly acidic mine drainage: Interactions between hydrobasaluminite, silica and trace metals from the nano to the meso-scale
Aluminum precipitates control the hydrochemistry and mineralogy of a broad variety of environments on Earth (e.g., acid mine drainage, AMD, coastal wetlands, boreal and alpine streams, tropical acid sulfate soils, laterites and bauxites, …). However, the geochemical and mineralogical processes controlling Al (and other associated metals and metalloids) transport and removal in those...
Authors
Manuel A. Caraballo, Richard Wanty, Philip Verplanck, Leonardo Navarro-Valdivia, Carlos Ayora, Michael Hochella
Application of hydrologic-tracer techniques to the Casargiu adit and Rio Irvi (SW-Sardinia, Italy): Using enhanced natural attenuation to reduce extreme metal loads
Hydrologic tracer techniques were applied to Rio Irvi (SW Sardinia), a stream affected by mine drainage, allowing the calculation of stream discharge and metal loads and comparison to other streams. The calculated discharge showed a continuous increase from near 21.2 L/s to 29.1 L/s. Cumulative loads of mine-related constituents, including the Casargiu adit inflow, were large, with more...
Authors
Giovanni De Giudici, Daniela Medas, Rosa Cidu, Pierfranco Lattanzi, Francesca Podda, Franco Frau, Nicola Rigonat, Claudia Pusceddu, Stefania Da Pelo, Patrizia Onnis, Pier Andrea Marras, Richard B. Wanty, Briant A. Kimball
Isotopic insights into biological regulation of zinc in contaminated systems
Aquatic organisms use a variety of biogeochemical reactions to regulate essential and non-essential trace metals. Many of these mechanisms can lead to isotopic fractionation, thus measurement of metal isotopes may yield insights into the processes by which organisms respond to metal exposure. We illustrate these concepts with two case studies, one involving an intra- and the other an...
Authors
Richard B. Wanty, Laurie S. Balistrieri, Jeff S. Wesner, David Walters, Travis S. Schmidt, Francesca Podda, G. De Giudici, Craig A. Stricker, Johanna M. Kraus, Pierfranco Lattanzi, Ruth E. Wolf, R. Cidu
Contrasting distributions of groundwater arsenic and uranium in the western Hetao basin, Inner Mongolia: Implication for origins and fate controls
Although As concentrations have been investigated in shallow groundwater from the Hetao basin, China, less is known about U and As distributions in deep groundwater, which would help to better understand their origins and fate controls. Two hundred and ninety-nine groundwater samples, 122 sediment samples, and 14 rock samples were taken from the northwest portion of the Hetao basin, and...
Authors
Huaming Guo, Yongfeng Jia, Richard B. Wanty, Yuxiao Jiang, Weiguang Zhao, Wei Xiu, Jiaxing Shen, Yuan Li, Yongsheng Cao, Yang Wu, Di Zhang, Chao Wei, Yilong Zhang, Wengeng Cao, Andrea L. Foster
Aquatic pollution increases use of terrestrial prey subsidies by stream fish
Stream food webs are connected with their riparian zones through cross-ecosystem movements of energy and nutrients. The use and impact of terrestrial subsidies on aquatic consumers is determined in part by in situ biomass of aquatic prey. Thus, stressors such as aquatic pollutants that greatly reduce aquatic secondary production could increase the need for and reliance of stream...
Authors
Johanna M. Kraus, Justin F. Pomeranz, Andrew S. Todd, David M. Walters, Travis S. Schmidt, Richard B. Wanty
Environmental effects on the aquatic system and metal discharge to the Mediterranean Sea from a near-neutral zinc-ferrous sulfate mine drainage
After mine closure in the 1980s and subsequent shutdown of the dewatering system, groundwater rebound led to drainage outflow from the Casargiu gallery (Montevecchio mine, SW Sardinia, Italy) beginning in 1997. Mine drainage had pH 6.0 and dissolved concentrations of sulfate (5000 mg/L) and metals (e.g., 1000 mg/L Zn, 230 mg/L Fe, 150 mg/L Mn) much higher than those previously measured...
Authors
Franco Frau, Daniela Medas, Stefania Da Pelo, Richard B. Wanty, Rosa Cidu
Non-USGS Publications**
Wanty, Richard B., 1986, Geochemistry of vanadium in an epigenetic sandstone-hosted vanadium-uranium deposit, Henry basin, Utah: Ph.D. Dissertation, Colorado School of Mines, 198 pp.
Wanty, Richard B., 1981, The use of radiogenic elements, and selected trace elements and their solution-mineral equilibria in groundwater as exploration tools for uranium deposits: M.S. Thesis, Colorado School of Mines, 151 pp.
Wanty, R.B., Langmuir, D., and Chatham, J.R., 1981, Groundwater prospecting for sandstone-type uranium deposits: The merits of mineral-solution equilibria versus single element tracer methods: U.S. Department of Energy, Grand Junction Office Report GJO-79-360-E, v. 2, 91 pp.
Chatham, J.R., Wanty, R.B., and Langmuir, D., 1981, National Uranium Resource Evaluation. Groundwater prospecting for sandstone-type uranium deposits: the merits of mineral-solution equilibria versus single element tracer methods. Final Report: U.S. Department of Energy, Grand Junction Office Report GJO-79-360-E, 197 pp.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Colorado Legacy Mine Lands Watershed Delineation and Scoring tool (WaDeS)
This web application, a summarized compilation of central Colorado water chemistry datasets from USGS and EPA, identifies legacy mine sites within the headwaters of central Colorado that could be good candidates for future remediation work based on stream metal concentrations, the number and complexity of mine features, and the potential for high natural background metal concentrations.
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government