Stuart Simmons portrait
  • Adjunct Professor, Geology & Geophysics
  • Research Professor, Chemical Engineering
801-581-4122

Publications

  • Joe Moore & John McLennan, Kris Pankow, Rob Podgorney, Jim Rutledge, Ben Dyer, Dimitrios, Karvounis, Falko Bethmann, Pengju Xing, Ben Barker, Clay Jones, Stuart Simmons, Branko Damjanac, Aleta Finnila (2023). Current Activities at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE): A Laboratory for Characterizing, Creating and Sustaining Enhanced Geothermal Systems. World Geothermal Congress. 11. Published, 04/21/2023.
  • Stuart Simmons & Stefan Kirby (2023). Mantle Helium in Cold Ground Water in the North Milford Valley and the Implications for Geothermal Resources at Roosevelt Hot Springs and the Utah FORGE EGS Field Site. Stanford University. Vol. 48, 7. Published, 02/08/2023.
  • Clay Jones & Kevin England, Stuart Simmons, Peter Rose, Mike Mella, Ben Barker, John McLennan, Joe Moore (2023). Stimulation, Tracers and Geochemistry at Utah FORGE. Stanford University. Vol. 48, 9. Published, 02/08/2023.
  • Stuart Simmons & Allis, R.G., Kirby, S.M., Moore, J.N., and Fischer, T.P. (2021). Interpretation of hydrothermal conditions, production- injection induced effects, and evidence for enhanced geothermal sys-temtype heat exchange in response to >30 years of production at Roosevelt Hot Springs, Utah, USA. Geological Society of America. Vol. 117, 30. Published, 11/04/2021.
    https://doi.org/10.1130/GES02348.1
  • Stuart Simmons & Stefan Kirby (2021). Western USA Assessment of High Value Materials in Geothermal and Produced Fluids. World Geothermal Congress. 11. Published, 10/25/2021.
    http://www.geothermal-energy.org/pdf/IGAstandard/W...
  • Robert Podgorney & Stuart Simmons, Aleta Finnila, John McLennan, Ghanashyam Neupane, Jeremy O’Brien, Janina Elliott, Phil Wannamaker, Brennan Williams, Bastien Poux and Joe Moore (2021). A Framework for Coordinated Earth and Numerical Modeling and Simulation of the Utah FORGE Site. World Geothermal Congress. 7. Published, 10/25/2021.
    http://www.geothermal-energy.org/pdf/IGAstandard/W...
  • Joseph Moore & John McLennan, Kristine Pankow, Stuart Simmons, Robert Podgorney, Philip Wannamaker, Clay Jones, and William Rickard (2021). The Utah Frontier Observatory for Research in Geothermal Energy (FORGE): A Laboratory for Characterizing, Creating and Sustaining Enhanced Geothermal Systems. World Geothermal Congress. 10. Published, 10/25/2021.
    http://www.geothermal-energy.org/pdf/IGAstandard/W...
  • Stuart Simmons & Stefan Kirby, Rick Allis, John Bartley, John Miller, Christian Hardwick, Clay Jones, Phil Wannamaker, Rob Podgorney, and Joseph Moore (2021). The Current Geoscientific Understanding of the Utah FORGE Site. World Geothermal Congress. 9. Published, 10/25/2021.
    http://www.geothermal-energy.org/pdf/IGAstandard/W...
  • Joseph Moore & Stuart Simmons, John McLennan, Kristine Pankow, Pengju Xing, Clay Jones, Aleta Finnela, Philip Wannamaker, and Robert Podgorney (2021). Current Activities at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE): A Laboratory for Characterizing, Creating and Sustaining Enhanced Geothermal Systems. Geothermal Rising. 12. Published, 10/08/2021.
  • Clay Jones & Joseph Moore and Stuart Simmons (2021). X-Ray Diffraction and Petrographic Study of Cuttings from Utah FORGE Well 16A(78)-32. Geothermal Rising. 11. Published, 10/08/2021.
  • Robert Podgorney & Aleta Finnila, Stuart Simmons, John McLennan (2021). A reference thermal-hydrologic-mechanical native state model of the Utah FORGE enhanced geothermal site. MPDI. 26. Published, 08/05/2021.
    https:// doi.org/10.3390/en14164758
  • Simmons, S.F., 2020, Geothermal Resources: Encyclopedia of Geology, 2nd Edition, Elsevier, v. 5, p. 708-722. Published, 12/16/2020.
    https://doi.org/10.1016/B978-0-12-409548-9.12546-1
  • Simmons, S.F., Tutolo, B., Barker, S.L., Goldfarb, R., and Robert, F., 2020, Hydrothermal Gold Deposition in Epithermal, Carlin, and Orogenic Deposits Geothermal Resources: Society of Economic Geologists Special Publication 23, p. 823-845. Published, 12/01/2020.
    https://doi.org/10.5382/SP.23.38
  • Simmons, S.F., Kirby, S., Allis, R., and Moore, J.N., 2020, Production Chemistry Evidence for an EGS-type Reservoir in Roosevelt Hot Springs and Implications for Utah FORGE: Proceedings, 45th Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, 7 p. Simmons, S.F., Kirby, S., Allis, R., and Moore, J.N., 2020, Production Chemistry Evidence for an EGS-type Reservoir in Roosevelt Hot Springs and Implications for Utah FORGE: Proceedings, 45th Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, 7 p. Published, 02/10/2020.
  • Moore, J., McLennan, K., Pankow, K., Simmons, S. F., Podgorney, R., Wannamaker, P., Jones, C., Richard, W., and Xing, P., 2020, The Utah Frontier Observatory for Research in Geothermal Energy (FORGE): A laboratory for characterizing, creating and sustaining enhanced geothermal systems: Proceedings, 45th Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, CA., 10 p. Published, 02/10/2020.
  • Wannamaker, P.E., Simmons, S.F., Miller, J.J., Hardwick, C.L. Erickson, B.A., Bowman, S.D., Kirby, S., Feigl, K.L. and Moore, J.N., 2020, Geophysical Activities over the Utah FORGE Site at the Outset of Project Phase 3: Proceedings, 45th Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, 14 p. Published, 02/10/2020.
  • Simmons, S.F., Tutolo, B., Barker, S.L.L., Goldfarb, R., and Robert, F., in press, Processes causing hydrothermal gold deposition in Epithermal, Carlin, and Orogenic Deposits. Accepted, 01/03/2020.
  • Simmons, S. F., in press, Geothermal Resources, Encyclopedia of Geology, 2nd Edition, Elsevier. Accepted, 12/29/2019.
  • Jones, C.G., Moore, J.N., and Simmons, S.F., 2019, Petrography of the Utah FORGE site and environs, Beaver County, Utah: Miscellaneous Publication 169-K Utah Geological Survey, https://doi.org/10.34191/MP-169-K, 45 p. Published, 07/01/2019.
    https://doi.org/10.34191/MP-169-K
  • Kirby, S.M., Simmons, S.F., Inkenbrandt, P.C., and Smith, S., 2019, Groundwater hydrogeology and geochemistry of the Utah FORGE site and vicinity: Miscellaneous Publication 169-E Utah Geological Survey, https://doi.org/10.34191/MP-169-E, 23 p. Published, 07/01/2019.
    https://doi.org/10.34191/MP-169-E
  • Rahilly, K., Simmons, S.F., and Fischer, T., 2019, Carbon dioxide flux and carbon and helium isotopic composition of soil gases across the FORGE site and Opal Mound fault: Miscellaneous Publication 169-I Utah Geological Survey, https://doi.org/10.34191/MP-169-I, 18 p. Published, 07/01/2019.
    https://doi.org/10.34191/MP-169-I
  • Moore, J.N., McLennan, J., Allis, R., Pankow, K., Simmons, S.F., Podgorney, R., Wannamaker, P. E., Bartley, J., Jones, C., and Rickard, W., 2019, The Utah Frontier Observatory for Geothermal Research (FORGE), An International Laboratory for Enhanced Geothermal System Technology Development: : Proceedings, 44th Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, p. 12. Published, 02/12/2019.
  • Simmons, S.F., Kirby, S., Bartley, J., Allis, R., Kleber, E., Knudsen, T., Miller, J., Hardwick, C., Rahilly, K., Fischer, T., Jones, C., and Moore, J.N., 2019, Update on the geoscientific understanding of the Utah FORGE site: Proceedings, 44th Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, 10 p. Published, 02/11/2019.
  • Mering, J.A., Barker, S.L.L., Huntington, K.W., Simmons, S. F., Dipple, G. Andrew, B., and Schauer, A., 2018, Taking the temperature of hydrothermal ore deposits using clumped isotope geothermometry: Economic Geology, v. 113, p. 1671-1678. Published, 12/01/2018.
    https://www.segweb.org/SEG/Publications/Economic_G...
  • Moore, J.N. & McLennan, J., Allis, R., Pankow, K., Simmons, S.F., Podgorney, R., Wannamaker, P. E., and Rickard, W. (2018). The Utah Frontier Observatory for Geothermal Research (FORGE), the results of recent drilling and geoscientific surveys. Geothermal Resources Council. Vol. 42, 16. Published, 10/01/2018.
  • Jones, C.G & Moore, J.N., and Simmons, S.F. (2018). Lithology and mineralogy of the Utah FORGE EGS reservoir, Beaver Co, Utah. Geothermal Resources Council. Vol. 42, 13. Published, 10/01/2018.
  • Simmons, S. & Kirby, S., Allis, R., Moore, J.N., and Fischer, T. (2018). Update on the production chemistry of Roosevelt Hot Springs reservoir. 43rd Stanford Workshop Reservoir Engineering. 7 pages. Published, 02/14/2018.
  • Simmons, S. & Moore, J.N., Allis, R., Kirby, S., Jones, C., Bartley, J., Kleber, E. Tyler, K., Milller, J., Hardwick, C., Rahilly, K., Gwynn, M., McLennan, J., Forbes, B., Podgorney, R., Pankow, K., Wannamaker, P., and Fischer, T., (2018). A revised geoscientific model of the FORGE Utah EGS laboratory. 43rd Stanford Workshop Reservoir Engineering. 8 pages. Published, 02/14/2018.
  • Simmons, S. & Kirby, S., Verplanck, P., and Kelley, K (2018). Strategic and critical elements in produced geothermal fluids from Nevada and Utah. 43rd Stanford Workshop Reservoir Engineering. 12 pages. Published, 02/14/2018.
  • Wannamaker, P.E. & Moore, J.N., Pankow, K.L., Simmons, S.F., Nash, G., Maris, V., Trow, A.J., Hardwick, C. (2017). Phase II of play fairway analysis for the Eastern Great Basin extensional regime, Utah: Status of indications. Proceedings Geothermal Resources Council,. Vol. 41, 2368-2382. Published, 10/04/2017.
  • Tiwari, S. & Simmons, S.F., and McLennan, J. (2017). A 2D HYDROTHERM model of the Utah FORGE site. Proceedings Geothermal Resources Council. Vol. 41, 314. Published, 10/04/2017.
  • Jones, C.G. & Barker, S., Simmons, S.F., Moore, J.N., and Bowman, J.R. (2017). The oxygen and carbon isotope systematics of carbonate-hosted geothermal reservoirs at Cove Fort and Thermo, Utah. Proceedings Geothermal Resources Council. Vol. 41, 1470-1480. Published, 10/04/2017.
  • Nash, G. & Brandt, A., Pfaff, B., Hardwick, C., Gwynn, M., Kelly, B., Simmons, S.F., and Bennett, C. (2017). Phase 2: Updated geothermal play fairway analysis of the Tularosa basin, New Mexico. Proceedings Geothermal Resources Council. Vol. 41, 2312-2327. Published, 10/04/2017.
  • Allis, R., Gwynn, M., Hardwick, C.L., Kirby, S., Bowers, R., Moore, J., Wannamaker, P.E., and Simmons, S.F., 2017, Characteristics of the Cove Fort-Dog Valley-Twin Peaks Thermal Anomaly, Utah: Proceedings 42 Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, 10 p. Published, 02/10/2017.
  • Simmons, S., Allis, R., Moore, J., Gwynn, M., Hardwick, C., Kirby, S., and Wannamaker, P., 2017, Conceptual Models of Geothermal Resources in the Eastern Great Basin: Proceedings 42nd Workshop on Geothermal Reservoir Engineering, Stanford, CA, 9 p. Published, 02/10/2017.
  • Wannamaker, P.E., Pankow, K.L., Moore, J.N., Nash, G.D., Maris, V., Simmons, S.F., Hardwick, C.L., Trow, A., and Allis, R., 2017, Phase II Activities in Play Fairway Analysis for Structurally Controlled Geothermal Systems in the Eastern Great Basin Extensional Regime, Utah: Proceedings 42 Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, 12 p. Published, 02/10/2017.
  • Simmons, S. F., Brown, K. L., and Tutulo, B., M., 2016, Hydrothermal transport of Ag, Au, Cu, Pb, Te, Zn, and other metals and metalloids in New Zealand geothermal systems: Spatial Patterns, Fluid-mineral Equilibria, and Implications for Epithermal Mineralization: Economic Geology,. Published, 08/2016.
  • Goldfarb, R.J., Hofstra, A.F., and Simmons, S.F., 2016, Critical Elements in Carlin, Epithermal, and Orogenic Gold Deposits: Reviews in Economic Geology, v. 18. Published, 04/2016.
  • Simmons, S. F., 2016, The Geology and Geochemistry of the Midas Geothermal System, north-central Nevada: Proceedings, 41st Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, p 291-299. Published, 02/2016.
  • Simmons, S. F., Kirby, S., Jones, C., Moore, J., and Allis, R., 2016, The Geology, Geochemistry, and Hydrology of the EGS FORGE Site, Milford Utah. Proceedings, 41st Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, p. 1181-1190. Published, 02/2016.
  • Wannamaker, P. E., Pankow, K. L., , Moore, J. N., Nash, G. D., Maris, V., Simmons, S.F., and Hardwick, C. L., 2016, A Play Fairway Analysis for Structurally Controlled Geothermal Systems in the Eastern Great Basin Extensional Regime, Utah: Proceedings, 41st Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, p. 308-323. Published, 02/2016.
  • Allis, R.G., Moore, J.N., Davatzes, N., Gwynn, M., Hardwick, C., Kirby, S., Pankow, K., Potter, S., and Simmons, S.F., 2016, EGS Concept Testing and Development at the Milford, Utah FORGE Site. Proceedings, 41st Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, p. 886-898. Published, 02/2016.
  • Simmons, S. F., Brown, K. L., Browne, P.R.L., and Rowland, J.R.,2016, Gold and silver resources in TVZ geothermal systems: Geothermics, v. 59, p. 205-214. Published, 01/2016.
  • Simmons, S. F., and Allis, R., 2015, Geothermal energy for mines and the opportunities for northeast Nevada: SEG Newsletter, n. 103, p. 1-18. Published, 10/2015.
  • Simmons, S.F., Kirby, S., Moore, J.N., Wannamaker, P., and Allis, R., 2015, Comparative analysis of fluid chemistry from Cove Fort, Roosevelt and Thermo: Implications for geothermal resources and hydrothermal systems on the east edge of the Great Basin: Proceedings Geothermal Resources Council, v. 39, p. 55-61. Published, 10/2015.
  • Kirby, S., Simmons, S.F., Gwynn, M., Allis, R., and Moore, J.N., , 2015,Comparisons of Geothermal Systems in Central Nevada: Evidence for Deep Regional Geothermal Potential Based on Heat Flow, Geology, and Fluid Chemistry: Proceedings Geothermal Resources Council, v. 39, p. 25-34. Published, 10/2015.
  • Wannamaker, P. E., Moore, J. N., Pankow, K. L., Simmons, S.F., Nash, G. D., Maris, V., Batchelor, C., and Hardwick, C. L., 2015, Play Fairway Analysis of the Eastern Great Basin Extensional Regime, Utah: Preliminary Indications: Proceedings Geothermal Resources Council, v. 39, p. 793-804. Published, 10/2015.
  • Rowland, J. and Simmons, S. F., 2015,Tectonic controls on the Epithermal Ore-forming Environment, Northern New Zealand: New Concepts and Discoveries-Geological Society of Nevada 2015 Symposium Proceedings, p. 695-704. Published, 05/2015.
  • Simmons, S. F., and Brown, K. L., 2015, Insights to High Temperature Geothermal Systems (New Zealand) from Trace Metal Aqueous Chemistry: Proceedings of the World Geothermal Congress 2015, Melbourne, Australia, 19-24 April, 2015, 6 pp. Published, 04/2015.

Presentations

  • Presidential address to the Society of Economic Geologists annual meeting London, UK. Other, Presented, 08/27/2023.
  • Simmons, S.F., Kirby, S., Moore, J.N., Wannamaker, P., and Allis, R., 2015, Comparative analysis of fluid chemistry from Cove Fort, Roosevelt and Thermo: Implications for geothermal resources and hydrothermal systems on the east edge of the Great Basin: Geothermal Resources Council Meeting, Reno, NV. Other, Presented, 09/2015.
  • Wannamaker, P. E., Moore, J. N., Pankow, K. L., Simmons, S.F., Nash, G. D., Maris, V., Batchelor, C., and Hardwick, C. L., 2015, Play Fairway Analysis of the Eastern Great Basin Extensional Regime, Utah: Preliminary Indications: Geothermal Resources Council Meeting, Reno, NV. Other, Presented, 09/2015.
  • Kirby, S., Simmons, S.F., Gwynn, M., Allis, R., and Moore, J.N., , 2015,Comparisons of Geothermal Systems in Central Nevada: Evidence for Deep Regional Geothermal Potential Based on Heat Flow, Geology, and Fluid Chemistry: Geothermal Resources Council Meeting, Reno, NV. Other, Presented, 09/2015.
  • Rowland, J. and Simmons, S. F., 2015,Tectonic controls on the Epithermal Ore-forming Environment, Northern New Zealand: New Concepts and Discoveries-Geological Society of Nevada 2015 Symposium . Conference Paper, Refereed, Presented, 05/2015.
  • Simmons, S. F., and Brown, K. L., Insights to High Temperature Geothermal Systems (New Zealand) from Trace Metal Aqueous Chemistry: Proceedings of the World Geothermal Congress 2015, Melbourne, Australia, 19-24 April, 2015,. Other, Presented, 04/2015.