Dr Andy Mitchell

Dr Andy Mitchell

Reader in Microbial Geochemistry

Contact Details


Andy Mitchell has come from Montana State University where he was an Assistant Research Professor in the Faculty of Chemical and Biological Engineering. Andy's interests are in the importance of microbes in regulating many common chemical reactions at the Earth's surface and in the deep subsurface, specifically through the interaction with mineral surfaces. He is particularly interested in how such processes allow microorganisms to survive in cold and icy environments and potentially on other planets. Andy also undertakes applied research into manipulating these biogeochemical processes for environmental engineering purposes, including metal and radionuclide pacification and geologic carbon capture and storage. Prior to this, Andy was a EU Marie Curie Fellow at the NanoGeoScience Centre, University of Copenhagen, a Postdoctoral Fellow in the Department of Microbiology, Montana State University, and a Postdoctoral Fellow in the Department of Geology, University of Toronto. Andy has travelled and worked all over the world, and is particularly drawn to mountainous areas and mountain sports.


Module Coordinator
  • Hydrochemistry and biogeochemistry
    • Environmental Engineering
    • Mineralogy

Postgraduate students

Very interested to hear from any students with interests in microbe-mineral interactions, mineral formation and stability, metal and radionuclide pacification, carbon capture and storage, glacial biogeochemistry and microbiology. Possible sources of funding available.


Lab and field based Microbial Geochemistry:

  • Microbe-metal-sediment interaction, transport and deposition
    • Biogeochemistry in glacierised and snow covered environments
    • Environmental engineering - Bioremediation in surface and groundwater; Subsurface geologic carbon sequestration, enhanced oil recovery

Recent Grants and funding:

  • EU Innovative Training Networks (ITN). 2016-2020. ‘MicroArctic’. Microorganisms in Warming Arctic Environments. No. 675546. £3.8M. Work Package Leader and Co-Investigator.
  • Sêr Cymru National Research Network award for Low Carbon, Energy and the Environment 2014-2019. 'Geo-Carb-Cymru' The potential of low carbon subsurface energy in Wales. (£771,000). Principal Investigator.
  • HEFCW research capital investment 2013-14. Ex2EL Extreme Experimental Environments Laboratory. Principal investigators Dr Andrew Mitchell and Dr Arwyn Edwards (£350,000).
  • EU Maire Curie Reintegration Grant. CO2 TRAP. Proposal No: 277005. PI. (€45,000). Principal Investigator.

Postoctoral Fellowships (host):

  • Newton International Postdoctoral Fellowship 2018-2020 (host). New insight into the microbial transformation of selenium for bio-remediation - Dr. Pallavee Srivastara.
  • EU Marie Curie COFUND postdoctoral fellowship 2017-2020 (Host). KAT-TRAP: Kinetic And Thermodynamic controls on calcium carbonate formation during geologic carbon TRAPping project - Dr. Karina Sand.


IGHPP Director of Research Science

Co-Director - Interdisciplinary Centre for Environmental Microbiology

Manager - Extreme Experimental Environments Laboratory (Ex2El)

Associate Editor Frontiers in Geochemistry

UK Mineralogical Society Committee Member

Research Groups


Near-surface hydraulic conductivity of Northern Hemisphere glaciersStevens, I. T., Irvine-Fynn, T., Porter, P. R., Cook, J. M., Edwards, A., Smart, M., Moorman, B. J., Hodson, A. J. & Mitchell, A. 2018 In : Hydrological Processes.32, 850-865
Microbial oxidation as a methane sink beneath the West Antarctic Ice SheetMichaud, A. B., Dore, J. E., Achberger, A. M., Christner, B. C., Mitchell, A., Skidmore, M. L., Vick-Majors, T. & Priscu, J. C. 2017 In : Nature Geoscience.10, p. 582-5865 p.
Physiological Ecology of Microorgansisms in Subglacial Lake WhillansVick-Majors, T. J., Mitchell, A., Achberger, A. M., Christner, B. C., Dore, J. E., Michaud, A. B., Priscu, J. C. & WISSARD Science Team 2016 In : Frontiers in Microbiology.7, 1705
Solute sources and geochemical processes in Subglacial Lake Whillans, West AntarcticaMichaud, A. B., Skidmore, M. L., Mitchell, A. C., Vick-Majors, T. J., Barbante, C., Turetta, C., Vangelder, W. & Priscu, J. C. 2016 In : Geology.44, 5, p. 347-350
Biogeochemistry and microbial diversity in the marine cavity beneath the McMurdo Ice Shelf, Antarctica: Biogeochemistry under the MCM ice shelfVick-majors, T. J., Achberger, A., Santibáñez, P., Dore, J. E., Hodson, T., Michaud, A. B., Christner, B. C., Mikucki, J., Skidmore, M. L., Powell, R., Adkins, W. P., Barbante, C., Mitchell, A., Scherer, R. & Priscu, J. C. 2016 In : Limnology and Oceanography.61, 2, p. 572-586
Combining satellite data for better tropical forest monitoringReiche, J., Lucas, R., Mitchell, A. L., Verbesselt, J., Hoekman, D. H., Haarpaintner, J., Kellndorfer, J. M., Rosenqvist, A., Lehmann, E. A., Woodcock, C. E., Seifert, F. M. & Herold, M. 2016 In : Nature Climate Change.6, 2, p. 120-1223 p.
Near-surface permeability of Northern Hemisphere GlaciersStevens, I. T., Irvine-Fynn, T., Porter, P. R., Smart, M., Moorman, B. J., Hodson, A. J., Edwards, A. & Mitchell, A. 2016 p. C41D-0708
Subglacial Lake Whillans microbial biogeochemistry: a synthesis of current knowledgeMikucki, J. A., Lee, P. A., Ghosh, D., Purcell, A. M., Mitchell, A., Mankoff, K. D., Fisher, A. T., Tulaczyk, S., Carter, S., Siegfried, M. R., Fricker, H. A., Hodson, T., Coenen, J., Powell, R., Scherer, R., Vick-Majors, T., Achberger, A. A., Christner, B. C. & Tranter, M. 2015 In : Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.374, 2059, 20140290
Design of a Meso-Scale High Pressure Vessel for the Laboratory Examination of Biogeochemical Subsurface ProcessesPhillips, A. J., Eldring, J. . J., Hiebert, R., Lauchnor, E., Mitchell, A., Cunningham, A., Spangler, L. & Gerlach, R. 2015 In : Journal of Petroleum Science and Engineering.126, p. 55-628 p.
Is there life on glaciers?: Glacier ecosystems and their impactsIrvine-Fynn, T., Edwards, A. & Mitchell, A. 2015 In : Geography Review.28, 3, p. 38-41
A microbial ecosystem beneath the West Antarctic ice sheetChristner, B. C., Priscu, J. C., Achberger, A. M., Barbante, C., Carter, S. P., Christianson, K., Michaud, A. B., Mikucki, J. A., Mitchell, A., Skidmore, M. L., Vick-Majors, T. J. & Science Team, T. W. I. S. S. A. R. D. 2014 In : Nature.512, 7514, p. 310-3134 p.
A germ theory for glacial systems?Edwards, A., Irvine-Fynn, T. D., Mitchell, A. C. & Edwards Rassner, S. M. 2014 In : WIREs Water.1, 4, p. 331-34010 p.
Microbial CaCO3 mineral formation and stability in an experimentally simulated high pressure saline aquifer with supercritical CO2.Mitchell, A. C., Phillips, A. J., Schultz, L., Parks, S., Spangler, L., Cunningham, A. B. & Gerlach, R. 2013 In : International Journal of Greenhouse Gas Control.15, p. 86-9611 p.
Abandoned Well CO2 Leakage Mitigation Using Biologically Induced Mineralization: Current Progress and Future Directions.Cunninghamam, A. B., Lauchnor, E., Eldring, J., Esposito, J., Mitchell, A. C., Gerlach, R., Phillips, A. J., Ebigbo, A. & Spangler, L. 2013 In : Greenhouse Gases: Science and Technology.3, 1, p. 40-4910 p.
Bacterially Induced Calcium Carbonate Precipitation and Strontium Coprecipitation in a Porous Media Flow SystemLauchnor, E. G., Schultz, L. N., Bugni, S., Mitchell, A. C., Cunningham, A. B. & Gerlach, R. 2013 In : Environmental Science & Technology.47, 3, p. 1557–15648 p.
Influence of bedrock mineral composition on microbial diversity in a subglacial environmentMitchell, A. C., Lafreniere, M. J., Skidmore, M. L. & Boyd, E. S. 2013 In : Geology.41, 8, p. 855-8585 p.
Potential CO2 Leakage Reduction through Biofilm-Induced Calcium Carbonate PrecipitationPhillipsa, A. J., Lauchnor, E., Eldring, J., Esposito, R., Mitchell, A. C., Gerlach, R. & Cunningham, A. B. 2012 In : Environmental Science & Technology.47, 1, p. 142-1498 p.
Role of outer membrane c-type cytochromes MtrC and OmcA in Shewanella oneidensis MR-1 cell production, accumulation, and detachment during respiration on hematiteMitchell, A. C., Peterson, L., Reardon, C. L., Reed, S. B., Culley, D. E., Romine, M. R. & Geesey, G. G. 2012 In : Geobiology.10, 4, p. 355-370
The low salinity effect observed on sandstone model surfacesHassenkam, T., Mitchell, A. C., Pederson, C., Skovbjerg, L., Bovet, N. & Stipp, S. 2012 In : Colloids and Surfaces A: Physicochemical and Engineering Aspects.403, p. 79-867 p.
Imaging Biologically Induced Mineralization in Fully Hydrated Flow SystemsSchultz, L., Pitts, B., Mitchell, A. C., Cunningham, A. B. & Gerlach, R. 2011 In : Microscopy Today.19, 5, p. 12-154 p.
Diversity, Abundance, and Potential Activity of Nitrifying and Nitrate-Reducing Microbial Assemblages in a Subglacial EcosystemBoyd, E. S., Lange, R. K., Mitchell, A. C., Havig, J. R., Hamilton, T. L., Lafrenière, M. J., Shock, E. L., Peters, J. W. & Skidmore, M. 2011 In : Applied and Environmental Microbiology.77, 14, p. 4778-47879 p.
Reducing the risk of well bore leakage of CO2 using engineered biomineralization barrierCunningham, A. B., Gerlach, R., Spangler, L., Mitchell, A. C., Parks, S. & Phillips, A. 2011 In : Energy Procedia.4, p. 5178-51858 p.
Siple Coast Subglacial Aquatic Environments: The Whillans Ice Stream Subglacial Access Research Drilling (WISSARD) projectFricker, H. A., Powell, R., Priscu, J., Tulaczyk, S., Anandakrishnan, S., Christner, B., Holland, D., Horgan, H., Jacobel, R., Mikucki, J., Mitchell, A., Scherer, R. & Severinghaus, J. 2011 Antarctic Subglacial Aquatic Environments. Siegert, M. J., Kennicutt II, M. C. & Bindschadler, R. A. (eds.). Wiley, Vol. 192, p. 199-219 (Proceedings of the Chapman Conference on the Exploration and Study of Antarctic Subglacial Aquatic Environments. American Geophysical Union, Washington, D.C.)
Methanogenesis in Subglacial SedimentsBoyd, E. S., Skidmore, M., Mitchell, A. C., Bakermans, C. & Peters, J. W. 2010 In : Environmental Microbiology Reports.2, 5, p. 685-6928 p.
Microbially enhanced carbon capture and storage by mineral-trapping and solubility-trappingMitchell, A. C., Dideriksen, K., Spangler, L. H., Cunningham, A. & Gerlach, R. 2010 In : Environmental Science & Technology.44, 13, p. 5270-52767 p.
Whillans Ice Stream Subglacial Access Research Drilling (WISSARD): Integrative Study of Marine Ice Sheet Stability and Subglacial Life Habitats (Invited)Tulaczyk, S. M., Anandakrishnan, S., Behar, A. E., Christner, B. C., Fisher, A. T., Fricker, H. A., Holland, D. M., Jacobel, R. W., Mikucki, J., Mitchell, A. C., Powell, R. D., Priscu, J. C., Scherer, R. P. & Severinghaus, J. P. 2009
Exploring Subglacial Microbial Ecology (Invited)Mikucki, J., Mitchell, A. C., Johnson, S. S. & Grzymski, J. 2009
Subglacial (bio)geochemical weathering and the unexplored Antarctic systemMitchell, A. C., Christner, B. C., Mikucki, J. & Priscu, J. C. 2009 p. abstract #U53C-09
Subglacial Methanogenesis and Its Role in Planetary Carbon CyclingBoyd, E., Skidmore, M. L., Mitchell, A. C., Bakermans, C. & Peters, J. 2009
Microbially Mediated Nitrogen Cycling in a Permanently Cold, High-Alpine, Subglacial Environment.Lange, R., Boyd, E., Mitchell, A. C., Hamilton, T., Peters, J. & Skidmore, M. 2009
Metal and carbon dioxide sequestration through biologically induced mineral precipitation: Influence of hydrodynamicsGerlach, R., Cunningham, A. B., Ferris, F. G. & Mitchell, A. C. 2009
Microbially enhanced carbonate mineralization and containment of CO2Mitchell, A. C., Phillips, A. J., Kaszuba, J. P., Hollis, W. K., Cunningham, A. L. B. & Gerlach, R. 2009 In : Geochimica et Cosmochimica Acta.72, 12, p. A636
Microbially enhanced geologic containment of sequestered supercritical CO2Cunningham, A. B., Gerlach, R., Spangler, L. & Mitchell, A. C. 2009 In : Energy Procedia.1, 1, p. 3245-32528 p.
Biofilm enhanced geologic sequestration of supercritical CO2Mitchell, A. C., Phillips, A. J., Hiebert, R., Gerlach, R., Spangler, L. H. & Cunninghamam, A. B. 2009 In : International Journal of Greenhouse Gas Control.3, 1, p. 90-9910 p.
Role of outer-membrane cytochromes on dissimilatory iron reduction under natural-flow conditionsMitchell, A. & Geesey, G. G. 2009 In : Applied and Environmental Microbiology.
Modeling geochemical and biogeochemical reactions in subglacial environments.Mitchell, A. C. & Brown, G. H. 2008 In : Arctic, Antarctic, and Alpine Research.40, 3, p. 531-54717 p.
Microbally Enhanced Carbon Capture and Storage by Mineral-Trapping and Solubility-Trapping (PCT International Application No.: PCT/US2009/069389)Cunningham, A., Spangler, L., Mitchell, A. & Gerlach, R. 2008
Biofilm enhanced subsurface sequestration of supercritical CO2Mitchell, A. C., Phillips, A., Kaszuba, J., Hollis, H. K., Gerlach, R. & Cunningham, A. 2008
Resilience of planktonic and biofilm cultures to supercritical CO2Mitchell, A. C., Phillips, A. J., Hamilton, M. A., Gerlach, R., Hollis, W. K., Kaszuba, J. P. & Cunningham, A. B. 2008 In : Journal of Supercritical Fluids.47, 2, p. 318-325
Need for Direct Measurements of Coupled Microbiological and Hydrological Processes at Different Scales in Porous Media SystemsGeesey, G. G. & Mitchell, A. C. 2008 In : Journal of Hydrologic Engineering.13, 1, p. 28-369 p.
Hyperspectral data for assessing carbon dynamics and biodiversity of forestsLucas, R. M., Mitchell, A. & Bunting, P. J. 2008 Hyperspectral Remote Sensing of Tropical and Subtropical Forests. Kalascka, M. & Sanchez-Azofeifa, G. A. (eds.). Taylor & Francis, p. 47-8640 p.
The influence of Bacillus Pasteurii on the nucleation and growth of Calcium CarbonateMitchell, A. & Ferris, F. G. 2007 In : Geomicrobiology Journal.23, 3-4, p. 213-22614 p.
Diurnal hydrological - physicochemical controls and sampling methods for minor and trace elements in an Alpine glacial hydrological systemMitchell, A. & Brown, G. H. 2007 In : Journal of Hydrology.332, 1-2, p. 123-14321 p.
Minor and trace elements as indicators of solute provenance and flow routing in a subglacial hydrological systemMitchell, A. C., Brown, G. H. & Fuge, R. 2006 In : Hydrological Processes.20, 4, p. 877-89721 p.
Effect of Strontium on the Size and Solubility of Calcite Crystals precipitated by Bacterial UreolysisMitchell, A. & Ferris, F. G. 2006 In : Environmental Science & Technology.40, 3, p. 1008-10147 p.
The Co-Precipitation of Sr into Calcite Precipitates Induced by Bacterial Ureolysis in Artificial Groundwater – Temperature and Kinetic DependenceMitchell, A. & Ferris, F. G. 2005 In : Geochimica et Cosmochimica Acta.69, 17, p. 4199-421012 p.
Characterising and Mapping Mangroves in Northern Australia Using Stereo Aerial Photography and Hyperspectral CASI DataLucas, R. M., Mitchell, A., Donnelly, B. & Milne, T. 2003 p. 2380-23823 p.
Integration of aerial photography, hyperspectral and SAR data for mangrove characterizationMitchell, A. & Lucas, R. M. 2001 p. 2193-21953 p.
Use of stereo aerial photography for assessing changes in the extent and height of mangrove canopies in tropical AustraliaLucas, R. M., Milne, A. K., Mitchell, A., Donnelly, B. & Ellison, J. 2000 p. 1880-1882