Richard Wanty

Biography

B.A., geochemistry, State University of New York at Binghamton
M.S., geochemistry, Colorado School of Mines
Ph.D., geochemistry, Colorado School of Mines

Research chemist with USGS since 1981.  Research interests center around environmental geochemistry, and coupling of geologic, hydrologic, and geochemical processes.  Current research topics include: landscape geochemistry and the relation between soil and ground-water geochemistry; geochemistry of mined or unmined mineral deposits and natural background geochemistry; geochemistry of non-traditional stable isotopes, especially those of iron, copper, and zinc.  Another current project is examining the usefulness of data mined from large online databases to evaluating regional geochemical baselines.  Previous research focused on brines produced with hydrocarbon resources, geochemistry of natural radionuclides in ground-water supplies, ground-water geochemistry in agricultural areas, and geochemistry of sandstone-hosted vanadium-uranium deposits.

I bike, ski, hike, camp, fish, or just about anything else outside.

 

Richard B. Wanty
US Geological Survey
MS 964d, Denver Federal Center
Denver, CO 80225
rwanty@usgs.gov
Education:
Ph.D., Geochemistry, 1986, Colorado School of Mines.  Thesis topic:  Field, experimental, and numerical modeling studies of the genesis of vanadium-uranium deposits in Utah, USA.
M.S., Geochemistry, 1981, Colorado School of Mines.  Thesis topic:  Trace- and radioelement geochemistry in sandstone aquifers hosting uranium deposits.
B.A., Geochemistry, 1979, State University of New York (SUNY) at Binghamton.  Degree awarded with Distinguished Independent Work in the Geological Sciences.
Professional Experience:
1981 to present    Research Chemist, U.S. Geological Survey
I have performed research focused on mineral and energy resources, trace-element geochemistry, drinking-water quality, radionuclide geochemistry, and various other topics.  My approach spans basic to applied research, and I have simultaneously maintained a strong component of outreach.  I have regular contact with Academia, other US Federal government agencies, and industry.  I have supervised graduate students at the M.S. and Ph.D. levels.  In all of my research projects, I combine geochemical, hydrologic, and geologic techniques, and numerical and experimental modeling as appropriate.  I was the project chief or principal investigator on the following studies, in addition to participating in numerous other projects:
•    Landscape Geochemistry (2001 to present).  I have been compiling large environmental datasets, primarily for ground water and surface-water chemistry, either by collecting new samples or by compiling existing data, and interpreting these data in the context of bedrock and surface geology, geologic structure, hydrologic landscapes, and local and regional climate effects.  We are also correlating our data to soil development and soil chemistry.  On a regional scale (10’s to 100’s of kilometers) there are systematic variations in water chemistry that are a direct result of water-rock interactions in the critical zone (the upper few meters to 10’s of meters of the crust), and I am now investigating the role of spatial density of sampling in developing detailed interpretations.  These studies are being conducted in the USA, in California, Alaska, and Colorado.
•    Development of Geoenvironmental Models of Mineral Deposits (1998 to present).  I played a pivotal role in initiating this project, which now includes almost 70 USGS researchers.  The goal of this research effort is to develop systemic models of the weathering of mineral deposits, whether mined or not.  From a scientific perspective, the approach involves weaving aspects of geology, geochemistry, hydrology, and biology into a fully coupled description of the behavior of mineral deposits in the weathering environment.  Our approach is to study local and regional-scale effects around known deposits, to develop a perspective of the relative importance of various natural processes in various geologic, climatic, and hydrologic settings.  From a societal perspective, our goal is to develop a reliable predictive capability for the weathering behavior of as-yet undiscovered deposits, so that we may anticipate the possible environmental impacts of developing such deposits.  To date, I have conducted field studies in the western US, Alaska, Hungary, Slovakia, Spain, and Romania.
•    Fate and transport of agricultural chemicals, especially nitrogen species, in watersheds (1990-1996).  The goal of this project was to assess various mechanisms that retard or enhance nitrate mobility, or transform nitrate, in an ecosystem in central Minnesota.  A broad range of geochemical and isotopic techniques were combined in this project, along with novel ground-water dating techniques, to evaluate migration pathways for N in the environment.  We performed in situ experiments of denitrification in a wetland and detailed sampling of shallow ground water along a flow line approaching the wetland.  Our results provided a geochemical basis for understanding wetland hydrology and the capacity of wetlands for mitigating the effects of overfertilization.
•    Natural occurrence of radon 222 and its parent radionuclides in ground and surface water (1986-1994).  This was a joint project with the USGS and the Colorado School of Mines.  Our team expertise comprised geochemistry, geology, and hydrogeology to evaluate the natural occurrence of radon and other radionuclides in water supplies, and possible human exposure to natural radionuclides because of domestic water use.  Spin-offs of this project included:  a study of sources of high concentrations of fluoride in water supplies drawn from the Pikes Peak Granite; geochemistry of radioactive waste repositories; and fundamentals of fracture hydrology.
•    Regional trends in ground-water chemistry and diagenetic mineralogy in the Uinta Basin, Utah (1986-1990).  I studied the postdepositional modification of porosity by water-rock chemical reactions, and the effects of those reactions on the quality of petroleum reservoirs.  Later interest in this project focused on the quality of the waters that are produced with hydrocarbons.  Detailed petrographic and ground-water chemical analyses were interpreted in the context of hydrogeologic models for the basin, to determine processes affecting the chemistry of subsurface fluids.
•    Vanadium geochemistry in vanadium-uranium deposits of the Colorado Plateau (1981-1986).  In this study, I devised a new analytical method to determine that vanadium in the ore is present as VIII, the chemically reduced but immobile form, and demonstrated experimentally that VIII could be produced by reduction of VIV by bacteriogenic H2S.  I conducted a critical review of vanadium thermochemistry to facilitate modeling of vanadium mineral-solution equilibria.  These results were extended to constrain models of global vanadium accumulation in marine and lacustrine sediments.
6/80 to 10/81    Assistant Geochemist, Gulf Research and Development Company.
I developed, wrote, and adapted various geochemical modeling programs for use on a variety of environmental problems including in situ coal gasification and uranium mining and milling.
6/79 to 6/81    Research Assistant, Colorado School of Mines (Master’s Thesis Research)
I studied processes affecting ground-water concentrations of the redox-sensitive trace elements arsenic, moybdenum, and selenium associated with sandstone-hosted uranium deposits.  These elements proved to be useful geochemical exploration tools.
6/77 to 6/79    Laboratory Assistant, SUNY at Binghamton
I participated in projects studying the environmental impact of sanitary-landfills, bacterial coal desulfurization to improve coal fuel quality, and diagenetic conversion of smectite to illite.
Professional Affiliations:
International Association of Geochemistry- Member and Associate Editor of Applied Geochemistry
The Geochemical Society
Academic Activities:
Since 1987, I have supervised numerous graduate students from the Colorado School of Mines, at both the M.S. and Ph.D. levels, from the Departments of Geology and Chemistry.  I have supervised several post-doctoral studies in geological and chemical projects.  I also have hosted students in my laboratory from Italy (University of Cagliari), and Spain (University of Huelva) and served on their thesis committees.
 

 

 

 

Publications and Scientific Lectures:
I have delivered more than 150 lectures to scientific and professional societies, universities, and civic groups, on topics related to my research activities, in the USA and in Italy, Hungary, the Czech Republic, Slovakia, Japan, Sweden, Spain, New Zealand, China, and Scotland.

Most significant publications:  The following publications are ones that I consider to be my most significant, in terms of scientific impact.
Wanty, R.B., and Goldhaber, M.B., 1992, Thermodynamics and kinetics of reactions involving vanadium in natural systems:  Accumulation of vanadium in sedimentary rocks:  Geochimica et Cosmochimica Acta v. 56, no. 4, pp. 1471-1483.
Wanty, R.B., and Nordstrom, D.K., 1993, Chapter 17:  Natural Radionuclides, in Alley, W.M., ed., Regional Ground-Water Quality:  Van Nostrand Reinhold. pp. 423-441.
Ódor, L., Wanty, R.B., Horváth, I., Fügedi, U., 1998, Mobilization and attenuation of metals downstream from a base-metal mining site in the Mátra Mountains, northeastern Hungary:  Journal of Geochemical Exploration, v. 65, pp. 47-60.
Wanty, R.B., Berger, B.R., Plumlee, G.S., King, T.V.V., 2002, Geoenvironmental models:  An Introduction, in Fabbri, A., Gaal, G., and McCammon, R., eds., Proceedings of a NATO Workshop on Resource Exploitation and Environmental Security:  Kluwer Academic Publishers, Dordrecht, Netherlands.  pp. 3-42.
Böhlke, J.K., Wanty, R.B., Tuttle, M.L., Delin, G., Landon, M., 2002, Denitrification in the recharge area and discharge area of a transient agricultural nitrate plume in a glacial outwash sand aquifer, Minnesota:  Water Resources Research, v. 38(7), 10.1029/2001WR000663 (200238), 26 p.
Witte, K.M., Wanty, R.B., and Ridley, W.I., 2004, Engelmann Spruce (Picea engelmannii) as a biological monitor of changes in soil metal loading related to past mining activity: Applied Geochemistry v. 19(9) pp. 1367-1376.
Wanty, R.B., and Seal, R.R. II, eds., 2004,  Proceedings of the 11th International Symposium on Water-Rock Interaction: Taylor and Francis, London, 1684 pp.
Wanty, R.B., and Berger, B.R., 2006, Geologic, hydrologic, and geochemical interpretations of mineral deposits as analogs for understanding transport of environmental contaminants:  Journal of Geochemical Exploration, v. 88, pp. 162-165.
Borrok, D.M., Wanty, R.B., Ridley, W.I., Wolf, R., Lamothe, P.J., Adams, M., 2007.  Separation of copper, iron, and zinc from complex aqueous solutions for isotopic measurement.  Chemical Geology, 242, pp. 400-414.
Wanty, R.B., Verplanck, P.L., San Juan, C.A., Church, S.E., Schmidt, T.S., Fey, D.L., DeWitt, E.H., Klein, T.L., 2009.  Geochemistry of surface waters in central Colorado, USA: An example of sampling scale versus detail.  Applied Geochemistry (available online December 2008, printed publication expected in Spring 2009).

Other Publications:  A publication list follows, with oldest publications first.
Chatham, J.R., Wanty, R.B., and Langmuir, D., 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, 197 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.
Wanty, R.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.
Goldhaber, M.B., Wanty, R.B., Chatham, J.R., Reynolds, R., and Langmuir, D., 1983, Interaction of subsurface brines with oxygenated meteoric water, Ray Point Uranium District, south Texas:  Sci. Geol. Mem., 73, Strasbourg, France, pp. 143-151.
Miller, W.R., Wanty, R.B., and McHugh, J.B., 1984, Application of mineral-solution equilibria to geochemical exploration for sandstone-hosted uranium deposits in two basins in west-central Utah:  Economic Geology, v. 79, no. 2, pp. 266-238.
Wanty, R.B., and Goldhaber, M.B., 1985, A method for the determination of vanadium and iron oxidation states in naturally occurring oxides and silicates:  Talanta, v. 32, no. 5, pp. 395-398.
Wanty, R.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.
Zielinski, R.A., Otton, J.K., Wanty, R.B., and Pierson, C.T., 1987, The geochemistry of water near a surficial, organic-rich uranium deposit, northeastern Washington state, U.S.A.:  Chemical Geology, v. 62, pp. 263-289.
Wanty, R.B., Chatham, J.R., and Langmuir, D., 1987, The solubilities of some major and minor element minerals in ground waters associated with a sandstone-hosted uranium deposit:  Bulletin de Minéralogie, v. 110, pp. 209-226.
Wanty, R.B., and Gundersen, L.C.S., 1987, Radionuclide concentrations in ground water from two areas in the Reading Prong, Eastern Pennsylvania, in  GEORAD Conference on Geological Causes of Radionuclide Anomalies:  Missouri Department of Natural Resources.  St. Louis, MO, April, 1987.
Wanty, R.B., and Gundersen, L.C.S., 1988, Ground water geochemistry and radon 222 distribution in two sites on the Reading Prong, Eastern Pennsylvania, in Marikos, M.A., and Hansman, R.H., eds., Geological Causes of Natural Radionuclide Anomalies:  Missouri Department of Natural Resources Special Publication No. 4, pp. 147-156.
Zielinski, R.A., Otton, J.K., Wanty, R.B., and Pierson, C.T., 1988, The aqueous geochemistry of uranium in a drainage containing uraniferous organic-rich sediments, Lake Tahoe area, Nevada, U.S.A.:  Uranium v. 4, pp. 281-305.
Goldhaber, M.B., Reynolds, R.L., Campbell, J.A., Wanty, R.B., Grauch, R.I., and Northrop, H.R., 1990, Genesis of the Tony M tabular-type vanadium-uranium deposit, Henry structural basin, Utah; Mechanisms of ore and gangue mineral formation at the interface between brine and meteoric water:  Economic Geology, v. 85, no. 2, pp. 236-250.
Reynolds, R.L., Fishman, N.S., Wanty, R.B., and Goldhaber, M.B., 1990, Iron sulfide minerals at Cement oil field, Oklahoma--Implications for magnetic detection of oil fields:  Geological Society of America Bulletin v. 102, pp. 368-380.
Wanty, R.B., Goldhaber, M.B., and Northrop, H.R., 1990, Geochemistry of vanadium in an epigenetic sandstone-hosted vanadium-uranium deposit, Henry basin, Utah:  Economic Geology v. 85, pp. 270-284.
Breit, G.N., and Wanty, R.B., 1991, Vanadium accumulation in carbonaceous rocks:  A review of geochemical controls during deposition and diagenesis:  Chemical Geology, v. 91, pp. 83-97.
Wanty, R.B., and Schoen, R., 1991, A review of the chemical processes affecting the mobility of radionuclides in natural waters, with applications, in Gundersen, L.C.S. and Wanty, R.B., Field Studies of Radon in Rocks, Soils, and Water:  United States Geological Survey Bulletin 1971, pp. 183-194.
Wanty, R.B., Briggs, P.H., and Gundersen, L.C.S., 1991, Geochemistry of ground water and radionuclide mobility in two areas of the Reading Prong, Eastern Pennsylvania, in Gundersen, L.C.S. and Wanty, R.B., Field Studies of Radon in Rocks, Soils, and Water:  United States Geological Survey Bulletin 1971, pp. 289-296.
Mullin, A., and Wanty, R.B., 1991, A comparison of two techniques for radon-222 measurement in water samples, in Gundersen, L.C.S. and Wanty, R.B., Field Studies of Radon in Rocks, Soils, and Water:  United States Geological Survey Bulletin 1971, pp. 231-235.
Wanty, R.B., Johnson, S.L., and Briggs, P.H., 1991, Radon-222 and its parent radionuclides in ground water from two study areas in New Jersey and Maryland:  Applied Geochemistry v. 6, pp. 305-318.
Wanty, R.B., Rice, C.A., Langmuir, D., Briggs, P.H., and Lawrence, E.P., 1991, Prediction of uranium adsorption by crystalline rocks:  the key role of reactive surface area:  Materials Research Society Symposium Proceedings Series, v. 212, pp. 695-702.
Lawrence, E.P., Wanty, R.B., and Briggs, P.H., 1991, Maps showing hydrostatic levels and general ground-water quality for an area near Conifer, Colorado:  U.S. Geological Survey Miscellaneous Field Investigations Map MF-2165 (1:24,000). (includes interpretive text).
Wanty, R.B., Pitman, J.K., and Fouch, T.D., 1991, Ground-water chemistry and diagenetic reactions in Tertiary sandstones of the Green River and Wasatch Formations, Uinta basin, Utah:  U.S. Geological Survey Bulletin 1787-X, pp. X1-X21.
Wanty, R.B., and Szabo, Z., 1991, Ground water, an important but neglected contributor to indoor radon and other radionuclide problems:  GSA Today, Geological Society of America, November, 1991.
Goldhaber, M.B., Wanty, R.B., Landis, G.P., Reynolds, R.L., Grauch, R.I., Whitney, C.G., and Rye, R.O., 1991, Genesis of the tabular-type vanadium-uranium deposits of the Henry basin, Utah- A reply:  Economic Geology v. 86, pp. 1353-1355.
Lawrence, E., Poeter, E., and Wanty, R.B., 1991, Geohydrologic, geochemical, and geologic controls on the occurrence of radon in ground water near Conifer, Colorado, USA:  Journal of Hydrology v. 127, pp. 367-386.
Wanty, R.B., Lawrence, E.P., and Gundersen, L.C.S., 1992, A theoretical model for the flux of radon-222 from rock to ground water, in Gates, A., and Gundersen, L.C.S., eds., Geologic Controls on Radon:  Geological Society of America Special Paper 271. pp. 73-78.
Lawrence, E.P., Wanty, R.B., and Nyberg, P., 1992, Contribution of 222Rn in domestic water supplies to 222Rn in indoor air in homes in Colorado:  Health Physics v. 62, pp. 171-177.
Wanty, R.B., Folger, P.F., Frishman, D., Briggs, P.H., Day, W.C., and Poeter, E., 1992, Weathering of Pikes Peak Granite:  Field, experimental, and modeling observations, in Kharaka, Y.K., and Maest, A.S., Proceedings of the 7th International Symposium on Water-Rock Interaction:  A.A. Balkema, Rotterdam, pp. 599-602.
Wanty, R.B., Folger, P.F., and Briggs, P.H., 1992, Ground-Water Chemistry of the Coal-Bearing Upper Cretaceous Mesaverde Formation, Wind River Reservation, Wyoming:  U.S. Geological Survey Administrative Report to the Bureau of Indian Affairs, 12 pp.
Wanty, R.B., Folger, P.F., and Briggs, P.H., 1992, Ground-Water Chemistry of the Coal-Bearing Upper Cretaceous Mesaverde Formation, Wind River Reservation, Wyoming, in Keefer, W.R., Metzger, W.J., and Godwin, L.H., eds., Wyoming Geological Association Special Symposium on Oil and Gas Resources of the Wind River Basin, Wyoming:  Casper, Wyoming, pp. 271-279.
Frishman, D., Day, W.C., Folger, P.F., Wanty, R.B., Briggs, P.H., and Poeter, E., 1993, Bedrock geologic controls on radon abundance in domestic well water, Conifer, Colorado, in The 1993 International Radon Conference, Denver, Colorado, Proceedings:  Denver, Colo., 1993, The American Association of Radon Scientists and Technologists, pp. IV20-IV30.
Folger, P.F., Nyberg, P., Wanty, R.B., and Poeter, E., 1994, Relationships between 222Rn dissolved in ground water supplies and indoor 222Rn concentrations in some Colorado Front Range houses:  Health Physics v. 67, pp. 245-253.
Wanty, R.B., Tuttle, M.L., Böhlke, J.K., and Briggs, P.H., 1994, Chemical analyses of ground and surface water from Battle Brook drainage basin, near Princeton, Minnesota:  U.S. Geological Survey Open-File Report 94-129, 26 pp.
Wanty, R.B., Tuttle, M.L., Landon, M.K., Delin, G.N., and Böhlke, J.K., 1995, Geochemistry of nitrogen in a farmed watershed near Princeton, Minnesota, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Colorado Springs, Colorado, Sept. 20-24, 1993:  U.S. Geological Survey Water Resources Investigations Report 94-4015, vol. 1, pp. 591-596.
Folger, P.F., Poeter, E., Wanty, R.B., Frishman, D., and Day, W.C., 1996, Controls on 222Rn variations in a fractured crystalline rock aquifer evaluated using aquifer tests and geophysical logging:  Ground Water, v. 34, no. 2, pp. 250-261.
Stanton, M.R., Wanty, R.B., Lawrence, E.P., and Briggs, P.H., 1996, Dissolved radon and uranium, and ground-water geochemistry in an area near Hylas, Virginia.  U.S. Geological Survey Bulletin 2070, 23 pp.
Wanty, R.B., and Kharaka, Y.K., 1997, USGS research on saline waters co-produced with energy resources:  United States Geological Survey Fact Sheet FS-003-97.
Folger, P.F., Poeter, E., Wanty, R.B., Day, W., and Frishman, D., 1997, 222Rn transport in a fractured, crystalline rock aquifer:  Results from numerical simulations. Journal of Hydrology, v. 195, pp. 45-77.
Wanty, R.B., Marsh, S.P., and Gough, L.P., eds., 1997, Proceedings of the Fourth International Symposium on Environmental Geochemistry, U.S. Geological Survey Open-File Report 97-496, 106 pp.
Wanty, R.B., Wang, B., Vohden, J., 1997, Studies of suction-dredge gold-placer mining operations along the Fortymile River, eastern Alaska:  USGS Fact Sheet FS-154-97.
Wanty, R.B., Miller, W.R., Zielinski, R.A., Plumlee, G.S., Bove, D.J., Lichte, F.E., Meier, A.L., Smith, K.S., 1998, Uranium mobility in surface waters draining mineralized areas in the western US, in Arehart, G.B. and Hulston, J.R., eds., Proceedings of the 9th International Symposium on Water-Rock Interaction:  Rotterdam, A.A. Balkema, pp. 1013-1016.
Wanty, R.B., 1999, Eh-pH relations, in Marshall, C. P. and Fairbridge, R.W., eds., Encyclopedia of Geochemistry:  Kluwer Academic Publishers, Dordrecht, Netherlands, pp. 183-186. 
Wanty, R.B., Berger, B.R., Plumlee, G.S., 1999, Environmental models of mineral deposits- A state of the art:  Geologica Hungarica, Series Geologica, Tomus 24, pp. 97-106.
Ódor, L., Wanty, R.B., Horváth, I., Fügedi, U., 1999, Environmental signatures of mineral deposits and areas of regional hydrothermal alteration in Northeastern Hungary: Geologica Hungarica, Series Geologica, Tomus 24, pp. 107-129.
Wanty, R.B., Miller, W.R., Briggs, P.H., and McHugh, J.B., 1999, Geochemical processes controlling uranium mobility in mine drainages, in Plumlee, G.S., and Logsdon, M.J., eds., The Environmental Geochemistry of Mineral Deposits:  Reviews in Economic Geology Volume 6A: Economic Geology Publishing Company, Littleton, Colorado, pp. 201-213. 
Crock, J.G., Gough, L.P., Wanty, R.B., Day, W.C., Wang, B., Gamble, B.M., Henning, M., Brown, Z.A., and Meier, A.L., 1999, Regional geochemical results from the analyses of rock, water, soil, stream sediment, and vegetation samples—Fortymile River watershed, east-central Alaska:  U.S. Geological Survey Open-File Report 99-33, 82 pp.
Wanty, R.B., Wang, B., Vohden, J., Briggs, P.H., Meier, A.H., 1999, Regional baseline geochemistry and environmental effects of gold-placer mining operations on the Fortymile River, eastern Alaska: U.S. Geological Survey Open-File Report 99-328, 24 pp.
Malem, F., Wanty, R.B., Viellenave, J.H., and Fontana, J.V., 2000, Probe sampling and geophysics applied to ground water evaluation of mine dumps:  Tailings and Mine Waste ’00, Balkema, Rotterdam, pp. 223-230.
Welch, A.H., Westjohn, D.B., Helsel, D.R., Wanty, R.B., 2000, Arsenic in ground water of the United States:  Ground Water, v. 38, no. 4, p. 589-604.
Wanty, R.B., Wang, B., Vohden, J., Briggs, P.H., Meier, A.H., 2000, Regional baseline geochemistry and environmental effects of gold-placer mining operations on the Fortymile River, Eastern Alaska, in Kelley, K.D., and Gough, L.P., eds., U.S. Geological Survey Professional Paper 1615, p. 101-110.
Wanty, R.B., and Winter, T.C., 2000, A simple device for measuring differences in hydraulic head between surface water and shallow ground water:  U.S. Geological Survey Fact Sheet FS-077-00.
Witte, K., Ridley, W.I., Wanty, R.B., and Harrison, W.R., 2000, Preliminary assessment of the use of Engelman Spruce (Picea Engelmanii) to monitor historical trends in trace metal movement in a mining-impacted alpine wetland, Waldorf, CO:  Proceedings of the 22nd Annual National Association of Abandoned Mine Lands programs Conference, Steamboat Springs, Colorado, September, 2000, 9 pp.
Wanty, R.B., Berger, B.R., and Tuttle M.L., 2001, Scale versus detail in water-rock investigations 1: A process-oriented framework for studies of natural systems, in Cidu, R., ed., Proceedings of the 10th International Symposium on Water-Rock Interaction, Swets and Zeitlinger (Balkema), Lisse, pp. 221-224.
Berger, B.R., Wanty, R.B., and Tuttle M.L., 2001, Scale versus detail in water-rock investigations 2: Field-scale models of fracture networks in mineral deposits, in Cidu, R., ed., Proceedings of the 10th International Symposium on Water-Rock Interaction, Swets and Zeitlinger (Balkema), Lisse, pp. 137-140.
Wanty, R.B., Shanks, W.C. III, Lamothe, P., Meier, A., Lichte, F., Briggs, P.H., Berger, B.R., 2001, Results of chemical and stable isotopic analyses of water samples collected in the Patagonia Mountains, southern Arizona, U.S. Geological Survey Open-File Report 01-463, 19 pp.
Limpitlaw, D., and Wanty, R.B., 2002, Report of the working group on geoenvironmental models, in Fabbri, A., Gaal, G., and McCammon, R., eds., Proceedings of a NATO Workshop on Resource Exploitation and Environmental Security:  Kluwer Academic Publishers, Dordrecht, Netherlands.
Tuttle, M.L., Wanty, R.B., and Berger, B.R., 2002, Environmental behavior of two molybdenum porphyry systems: in Progress on Geoenvironmental Models for Selected Mineral Deposit Types, Seal R.R., II, and Foley, N.K., eds., USGS Open-file Report 02-195, pp. 65-86.
Seal, R.R. II, Foley, N.K., and Wanty, R.B., 2002, Introduction to Geoenvironmental Models of Mineral Deposits: in Progress on Geoenvironmental Models for Selected Mineral Deposit Types, Seal R.R., II, and Foley, N.K., eds., USGS Open-file Report 02-195, pp. 1-7.
Wanty, R.B., Berger, B.R., Kimball, B.A., Verplanck, P.L., and Tuttle, M.L., 2003, Delineation of environmental tracts in mineralized areas using geologic criteria:  Proceedings of the 4th European Conference on Regional Geoscientific Cartography, Bologna, Italy.
Wanty, R.B., Tuttle, M.L., Berger, B.R., Bove, D., and Eppinger, R.G., 2003, Environmental behavior of several porphyry molybdenum and copper deposits in the western US:  Proceedings of the 4th European Conference on Regional Geoscientific Cartography.
Chapin, T., Wanty, R.B., 2003, Development of a real-time in situ zinc analyzer and water sampler — Results from high resolution monitoring of a stream impacted by acid rock drainage. Sixth International Conference on Acid Rock Drainage, July 2003, Cairns, Australia, conference proceedings, pp 987-999.
Tuttle, M.L.W., Wanty, R.B., and Berger, B.R., 2003, Environmental control on water quality; case studies from Battle Mountain mining district, north-central Nevada, U.S. Geological Survey Bulletin, No. B 2210-A, 30p.
Wang, B., Wanty, R.B., and Vohden, J., 2004, Geochemical processes and geologic framework influencing surface water and sediment chemistry in the Fortymile River watershed, east-central Alaska, in, Gough, L.P., ed., Selected Geochemical and Biogeochemical Studies of the Fortymile River Watershed, Alaska: U.S. Geological Survey Professional Paper 1685, pp. 3-19.
Wanty, R.B., Verplanck, P.L., Kimball, B.A., Tuttle, M.L., Runkel, R.L., and Berger, B.R., 2004, Resolving natural and anthropogenic sources of solutes to a watershed from historic mining, in, Wanty, R.B., and Seal, R.R. II, eds., Proceedings of the 11th International Symposium on Water-Rock Interaction: Taylor and Francis, London, pp. 1659-1663.
Verplanck, P.L., Wanty, R.B., Berger, B.R., Tuttle, M.L., Kimball, B.A., and Farmer, G.L., 2004, Hydrogeochemistry of an acidic, alpine watershed, Redwell basin, Colorado, in, Wanty, R.B., and Seal, R.R. II, eds., Proceedings of the 11th International Symposium on Water-Rock Interaction: Taylor and Francis, London, pp. 1649-1653.
Lorrai, M., Fanfani, L., Lattanzi, P., and Wanty, R.B., 2004, Processes controlling groundwater chemistry of a coastal area in SE Sardinia (Italy), in, Wanty, R.B., and Seal, R.R. II, eds., Proceedings of the 11th International Symposium on Water-Rock Interaction: Taylor and Francis, London, pp. 439-442.
Chapin, T., and Wanty, R.B., 2004, Diel cycling of Zn, Mn, and Cu in a stream impacted by acid rock drainage, in, Wanty, R.B., and Seal, R.R. II, eds., Proceedings of the 11th International Symposium on Water-Rock Interaction: Taylor and Francis, London, pp. 1463-1467.
Chapin, T., Wanty, R.B., 2005, Development of a solenoid pumped in-situ zinc analyzer for environmental monitoring: Analytica Chimica Acta v. 543, pp. 199-208.
Stetson, S., Wanty, R.B., Helsel, D.R., Kalkhoff, S., and Macalady, D.L., 2006, Stability of low levels of perchlorate in drinking water and natural water samples:  Analytica Chimica Acta v. 567, pp. 108-113.
Smith, K.S., Ranville, J.F., Adams, M.K., Choate, L.M., Church, S.E., Fey, D.L., Wanty, R.B., and Crock, J.G., 2006, Predicting toxic effects of copper on aquatic biota in mineralized areas by using the Biotic Ligand Model, in Proceedings of the Seventh International Conference on Acid Rock Drainage (ICARD 7), St. Louis, Missouri, March 26-30, 2006, p. 2055-2077.
Wang, B., Gough, L., Wanty, R., Vohden, J., Crock, J., and Day, W., 2006, Water and sediment chemical data and data summary for samples collected in 1999 and 2001 in the Goodpaster River basin, Big Delta B-2 quadrangle, Alaska:  U.S. Geological Survey Open-File Report 2006-1131 (available at http://pubs.usgs.gov/of/2006/1131/)
Fey, D.L., Church, S.E., Schmidt, T.S., Wanty, R.B., Verplanck, P.L., Lamothe, P.J., Adams, M., and Anthony, M.W., 2007, Selected field parameters from streams and analytical data from water and macroinvertebrate samples, Central Colorado Assessment Project, Environmental assessment task, 2004 and 2005:  U.S. Geological Survey Open-File Report 2007-1044, 41 pp.
Wanty, R.B., Berger, B.R., Tuttle, M.L., Briggs, P.H., Meier, A.L., and Crock, J.G., 2006, Hydrogeochemical Investigations in the Osgood Mountains, North-Central Nevada, U.S. Geological Survey Bulletin 2210-B, 19 p.
Crock, J.G., Briggs, P.H., Gough, L.P., Wanty, R.B., and Brown, Z.A., 2007. Regional Geochemical Results from the Reanalysis of NURE Stream Sediment Samples — Eagle 3° Quadrangle, East-Central Alaska.  U.S. Geological Survey Open-File Report 2007-1075.
Verplanck, P.L., Manning, A.H., Mast, M. A., Wanty, R.B., McCleskey, R.B., Todorov, Todor, and Adams, Monique, 2007, Selected water-quality data for the Standard Mine, Gunnison County, Colorado, 2006-2007: U.S. Geological Survey Open-File Report 2007-1241, 12 p.
Wanty, R.B., Verplanck, P.L., Fey, D.L., Church, S.E., San Juan, C.A., and Swigert, V.A., 2007.  Geochemistry of surface water in alpine catchments in central Colorado, USA: An example of sampling scale versus detail.  In, Bullen, T.D., and Wang, Y. (eds.), Proceedings of the 12th International Symposium on Water-Rock Interaction, Taylor and Francis, London, pp. 453-456.
Wang, B., Gough, L., Wanty, R.B., Crock, J., Day, W., and Vohden, J., 2007.  Landscape geochemistry near mineralized areas of eastern Alaska with a focus on As and Sb. In, Bullen, T.D., and Wang, Y. (eds.), Proceedings of the 12th International Symposium on Water-Rock Interaction, Taylor and Francis, London, pp. 1513-1516.
Manning, A.H., Verplanck, P.L., Mast, M.A. and Wanty, R.B., 2008. Hydrogeologic investigation of the Standard Mine vicinity, Upper Elk Creek basin, Colorado.  U.S. Geological Survey Scientific Investigations Report 2007-5265, 131 pp.
Balistrieri, L. S., Borrok, D. M., Wanty, R. B., Ridley, W. I. (2008) Fractionation of Cu and Zn isotopes during adsorption onto amorphous Fe(III) oxides: Experimental mixing of acid rock drainage and pristine river water. Geochimica et Cosmochimica Acta 72, 311-328.
Borrok, D., Nimick, D.A., Wanty, R.B., and Ridley, W.I. (2008) Isotopic variations of dissolved copper and zinc in stream waters affected by historical mining. Geochimica et Cosmochimica Acta, 72(2) 329-344.
Schmidt, T.S., Church, S.E., Clements, W.H., Mitchell, K.A., Fey, D.L., Wanty, R.B., Verplanck, P.L., San Juan, C.A., Klein, T.L., DeWitt, E.H., and Rockwell, B.W., 2008, Aquatic ecosystems in Central Colorado are influenced by mineral forming processes and historical mining, Proceedings of the 3rd Interagency Conference on Research in Watersheds, Estes Park, CO., Sept. 8-11, 2008.
Schmidt, T.S., Church, S.E., Clements, W.H., Mitchell, K., Fey, D.L., Wanty, R.B., Verplanck, P.L., SanJuan, C.A., Adams, M., 2008. The effect of mines on aquatic communities in Central Colorado.  The Third Interagency Conference on Research in Watersheds.  Estes Park, CO.  September 2008.
Church, S.E., Fey, D.L., Klein, T.L., Schmidt, T.S., Wanty, R.B., DeWitt, E.H., Rockwell, B.W., and San Juan, C.A., 2008, Environmental effects of hydrothermal alteration and historical mining on water and sediment quality in central Colorado. Proceedings of the Third Interagency Conference on Research in Watersheds, Estes Park, Colo., Sept. 8-11, 2008.
Wanty, R.B., Goldhaber, M.B., Morrison, J.M., and Lee, L., 2009.  Regional variations in ground-water quality and relationships to soil and bedrock weathering in the southern part of the Sacramento Valley, north-central California, USA.  Applied Geochemistry (in press).
Borrok, D.M., Wanty, R.B., Ridley, W.I., Lamothe, P.J., Kimball, B.A., Verplanck, P.L., Runkel, R.L., 2009. Distinguishing between natural and anthropogenic metal sources in a mountain watershed using iron and zinc isotopes. Applied Geochemistry, 24(7), 1270-1277.

REPORTS WITH PUBLICATION PENDING
Wanty, R.B., Wang, B., Vohden, J., Day, W.C., Gough, L.P. (2008) Aufeis accumulations in stream bottoms in arctic and subarctic environments as a possible indicator of geologic structure. in Gough, L.P. and Day, W.C., eds., Recent U.S. Geological Survey studies in the Tintina gold province Alaska, U.S.A., and Yukon, Canada--Summary results of a 5-year project: U.S. Geological Survey Scientific Investigations Report 2008-5289 (in press)