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.



Lab and field based research into

  • Biogeochemical weathering and mineral formation
    • Microbe-metal-sediment interaction, transport and deposition
    • Environmental and hydrological 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). 2015-2020. 'MicroArctic'. No. 675546. £3.8M. 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. Principal investigator. Partners Cardiff University, British Geological Survey, The 'Big Pit' National Coal Museum of Wales. (£771,000).
  • HEFCW research capital investment 2013-14. Ex2EL Extreme Experimental Environments Laboratory. Managers / Principal investigators Dr Andrew Mitchell and Dr Arwyn Edwards (£350,000).
  • EU Maire Curie Reintegration Grant. CO2 TRAP. Proposal No: 277005. PI. (€45,000).
  • NSF (2009) GBASE - (GeoMicrobiology of Antarctic Subglacial Environments). Date Submitted: June 2008. Co-Principal investigator with John Priscu. Montana State University, and Slawek Tulaczyk (UC Santa Cruz). Proposal No: 0838933. ($1,121,000).
  • US Department of Energy, Office of Science (2009). Microbial Activity and Precipitation at Solution-Solution Mixing Zones in Porous Media. Date Submitted: April 2008. Co-Principal investigator with Frederick S. Colwell (Oregon State University), George Redden (INL), and Robin Gerlach (Montana State University). Submitted to DE-PS02-08ER08-09. ($1,348,7800)

Research Groups



Michaud, A.B., Dore, J.E., Achberger, A.M., Christner, B.C., Mitchell, A., Skidmore, M.L., Vick-Majors, T., Priscu, J.C. 2017. Microbial oxidation as a methane sink beneath the West Antarctic Ice Sheet. Nature Geoscience 10 pp. 582-586. 10.1038/ngeo2992 Other


Vick-Majors, T.J., Mitchell, A., Achberger, A.M., Christner, B.C., Dore, J.E., Michaud, A.B., Priscu, J.C., , 2016. Physiological Ecology of Microorgansisms in Subglacial Lake Whillans. Frontiers in Microbiology 7 1705 10.3389/fmicb.2016.01705 Cadair

Michaud, A.B., Skidmore, M.L., Mitchell, A.C., Vick-Majors, T.J., Barbante, C., Turetta, C., Vangelder, W., Priscu, J.C. 2016. Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica. Geology 44 (5) pp. 347-350. 10.1130/G37639.1 Cadair

Vick-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. Biogeochemistry and microbial diversity in the marine cavity beneath the McMurdo Ice Shelf, Antarctica: Biogeochemistry under the MCM ice shelf. Limnology and Oceanography 61 (2) pp. 572-586. 10.1002/lno.10234 Cadair

Stevens, I.T., Irvine-Fynn, T., Porter, P.R., Smart, M., Moorman, B.J., Hodson, A.J., Edwards, A., Mitchell, A. 2016. Near-surface permeability of Northern Hemisphere Glaciers. AGU Fall Meeting 2016. Other Cadair


Mikucki, 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. Subglacial Lake Whillans microbial biogeochemistry: a synthesis of current knowledge. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374 (2059) 20140290 10.1098/rsta.2014.0290 Cadair

Phillips, A.J., Eldring, J.(., Hiebert, R., Lauchnor, E., Mitchell, A., Cunningham, A., Spangler, L., Gerlach, R. 2015. Design of a Meso-Scale High Pressure Vessel for the Laboratory Examination of Biogeochemical Subsurface Processes. Journal of Petroleum Science and Engineering 126 pp. 55-62.

Irvine-Fynn, T., Edwards, A., Mitchell, A. 2015. Is there life on glaciers?: Glacier ecosystems and their impacts. Geography Review 28 (3) pp. 38-41. Cadair


Christner, 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. 2014. A microbial ecosystem beneath the West Antarctic ice sheet. Nature 512 (7514) pp. 310-313. 10.1038/nature13667 Cadair

Edwards, A., Irvine-Fynn, T.D., Mitchell, A.C., Edwards Rassner, S.M. 2014. A germ theory for glacial systems? WIREs Water 1 (4) pp. 331-340. 10.1002/wat2.1029 Cadair


Mitchell, A.C., Phillips, A.J., Schultz, L., Parks, S., Spangler, L., Cunningham, A.B., Gerlach, R. 2013. Microbial CaCO3 mineral formation and stability in an experimentally simulated high pressure saline aquifer with supercritical CO2. International Journal of Greenhouse Gas Control 15 pp. 86-96. 10.1016/j.ijggc.2013.02.001 Cadair

Cunninghamam, A.B., Lauchnor, E., Eldring, J., Esposito, J., Mitchell, A.C., Gerlach, R., Phillips, A.J., Ebigbo, A., Spangler, L. 2013. Abandoned Well CO2 Leakage Mitigation Using Biologically Induced Mineralization: Current Progress and Future Directions. Greenhouse Gases: Science and Technology 3 (1) pp. 40-49. 10.1002/ghg.1331 Cadair

Lauchnor, E.G., Schultz, L.N., Bugni, S., Mitchell, A.C., Cunningham, A.B., Gerlach, R. 2013. Bacterially Induced Calcium Carbonate Precipitation and Strontium Coprecipitation in a Porous Media Flow System. Environmental Science & Technology 47 (3) pp. 1557–1564. 10.1021/es304240y Cadair

Mitchell, A.C., Lafreniere, M.J., Skidmore, M.L., Boyd, E.S. 2013. Influence of bedrock mineral composition on microbial diversity in a subglacial environment. Geology 41 (8) pp. 855-858. 10.1130/G34194.1 Cadair


Phillipsa, A.J., Lauchnor, E., Eldring, J., Esposito, R., Mitchell, A.C., Gerlach, R., Cunningham, A.B. 2012. Potential CO2 Leakage Reduction through Biofilm-Induced Calcium Carbonate Precipitation. Environmental Science & Technology 47 (1) pp. 142-149. 10.1021/es301294q Cadair

Mitchell, A.C., Peterson, L., Reardon, C.L., Reed, S.B., Culley, D.E., Romine, M.R., Geesey, G.G. 2012. Role of outer membrane c-type cytochromes MtrC and OmcA in Shewanella oneidensis MR-1 cell production, accumulation, and detachment during respiration on hematite. Geobiology 10 (4) pp. 355-370. 10.1111/j.1472-4669.2012.00321.x Cadair

Hassenkam, T., Mitchell, A.C., Pederson, C., Skovbjerg, L., Bovet, N., Stipp, S. 2012. The low salinity effect observed on sandstone model surfaces. Colloids and Surfaces A: Physicochemical and Engineering Aspects 403 pp. 79-86. 10.1016/j.colsurfa.2012.03.058 Cadair


Schultz, L., Pitts, B., Mitchell, A.C., Cunningham, A.B., Gerlach, R. 2011. Imaging Biologically Induced Mineralization in Fully Hydrated Flow Systems. Microscopy Today 19 (5) pp. 12-15. 10.1017/S1551929511000848 Other Cadair

Boyd, 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. Diversity, Abundance, and Potential Activity of Nitrifying and Nitrate-Reducing Microbial Assemblages in a Subglacial Ecosystem. Applied and Environmental Microbiology 77 (14) pp. 4778-4787. 10.1128/AEM.00376-11 Cadair

Cunningham, A.B., Gerlach, R., Spangler, L., Mitchell, A.C., Parks, S., Phillips, A. 2011. Reducing the risk of well bore leakage of CO2 using engineered biomineralization barrier. Energy Procedia 4 pp. 5178-5185. 10.1016/j.egypro.2011.02.495 Cadair

Fricker, 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. Siple Coast Subglacial Aquatic Environments: The Whillans Ice Stream Subglacial Access Research Drilling (WISSARD) project. In M. J. Siegert., M. C. Kennicutt II., R. A. Bindschadler. (eds) Antarctic Subglacial Aquatic Environments. Proceedings of the Chapman Conference on the Exploration and Study of Antarctic Subglacial Aquatic Environments. American Geophysical Union, Washington, D.C. Wiley pp. 199-219. Cadair


Boyd, E.S., Skidmore, M., Mitchell, A.C., Bakermans, C., Peters, J.W. 2010. Methanogenesis in Subglacial Sediments. Environmental Microbiology Reports 2 (5) pp. 685-692. 10.1111/j.1758-2229.2010.00162.x Cadair

Mitchell, A.C., Dideriksen, K., Spangler, L.H., Cunningham, A., Gerlach, R. 2010. Microbially enhanced carbon capture and storage by mineral-trapping and solubility-trapping. Environmental Science & Technology 44 (13) pp. 5270-5276. 10.1021/es903270w Cadair


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. Whillans Ice Stream Subglacial Access Research Drilling (WISSARD): Integrative Study of Marine Ice Sheet Stability and Subglacial Life Habitats (Invited). American Geophysical Union Fall Meeting 2010. Cadair

Mikucki, J., Mitchell, A.C., Johnson, S.S., Grzymski, J. 2009. Exploring Subglacial Microbial Ecology (Invited). Cadair

Mitchell, A.C., Christner, B.C., Mikucki, J., Priscu, J.C. 2009. Subglacial (bio)geochemical weathering and the unexplored Antarctic system. American Geophysical Union Fall Meeting 2009. Cadair

Boyd, E., Skidmore, M.L., Mitchell, A.C., Bakermans, C., Peters, J. 2009. Subglacial Methanogenesis and Its Role in Planetary Carbon Cycling. American Geophysical Union Fall Meeting 2010. Other Cadair

Lange, R., Boyd, E., Mitchell, A.C., Hamilton, T., Peters, J., Skidmore, M. 2009. Microbially Mediated Nitrogen Cycling in a Permanently Cold, High-Alpine, Subglacial Environment. American Geophysical Union Fall Meeting 2010. Cadair

Gerlach, R., Cunningham, A.B., Ferris, F.G., Mitchell, A.C. 2009. Metal and carbon dioxide sequestration through biologically induced mineral precipitation: Influence of hydrodynamics. 237th ACS National Meeting, Salt Lake City, Utah. Cadair

Mitchell, A.C., Phillips, A.J., Kaszuba, J.P., Hollis, W.K., Cunningham, A.L.B., Gerlach, R. 2009. Microbially enhanced carbonate mineralization and containment of CO2. Geochimica et Cosmochimica Acta 72 (12) 18th Annual V. M. Goldschmidt Conference. pp. A636. 10.1016/j.gca.2008.05.016 Cadair

Cunningham, A.B., Gerlach, R., Spangler, L., Mitchell, A.C. 2009. Microbially enhanced geologic containment of sequestered supercritical CO2. Energy Procedia 1 (1) Proceedings of the 9th International Conference on Greenhouse Gas Control Technologies (GHGT-9). pp. 3245-3252. 10.1016/j.egypro.2009.02.109 Cadair

Mitchell, A.C., Phillips, A.J., Hiebert, R., Gerlach, R., Spangler, L.H., Cunninghamam, A.B. 2009. Biofilm enhanced geologic sequestration of supercritical CO2. International Journal of Greenhouse Gas Control 3 (1) pp. 90-99. 10.1016/j.ijggc.2008.05.002 Cadair Other

Mitchell, A., Geesey, G.G. 2009. Role of outer-membrane cytochromes on dissimilatory iron reduction under natural-flow conditions. Applied and Environmental Microbiology Cadair


Cunningham, A., Spangler, L., Mitchell, A., Gerlach, R. 2008. Microbally Enhanced Carbon Capture and Storage by Mineral-Trapping and Solubility-Trapping (PCT International Application No.: PCT/US2009/069389). Cadair

Mitchell, A.C., Phillips, A., Kaszuba, J., Hollis, H.K., Gerlach, R., Cunningham, A. 2008. Biofilm enhanced subsurface sequestration of supercritical CO2. American Geophysical Union Fall Meeting 2010. Cadair

Mitchell, A.C., Phillips, A.J., Hamilton, M.A., Gerlach, R., Hollis, W.K., Kaszuba, J.P., Cunningham, A.B. 2008. Resilience of planktonic and biofilm cultures to supercritical CO2. Journal of Supercritical Fluids 47 (2) pp. 318-325. 10.1016/j.supflu.2008.07.005 Cadair

Geesey, G.G., Mitchell, A.C. 2008. Need for Direct Measurements of Coupled Microbiological and Hydrological Processes at Different Scales in Porous Media Systems. Journal of Hydrologic Engineering 13 (1) pp. 28-36. 10.1061/(ASCE)1084-0699(2008)13:1(28) Cadair

Lucas, R.M., Mitchell, A., Bunting, P.J. 2008. Hyperspectral data for assessing carbon dynamics and biodiversity of forests. In M. Kalascka., G. A. Sanchez-Azofeifa. (eds) Hyperspectral Remote Sensing of Tropical and Subtropical Forests. Taylor & Francis pp. 47-86. Cadair

Mitchell, A.C., Brown, G.H. 2008. Modeling geochemical and biogeochemical reactions in subglacial environments. Arctic, Antarctic, and Alpine Research 40 (3) pp. 531-547. 10.1657/1523-0430(06-075)[MITCHELL]2.0.CO;2 Cadair


Mitchell, A., Brown, G.H. 2007. Diurnal hydrological - physicochemical controls and sampling methods for minor and trace elements in an Alpine glacial hydrological system. Journal of Hydrology 332 (1-2) pp. 123-143. 10.1016/j.jhydrol.2006.06.026 Other Cadair

Mitchell, A., Ferris, F.G. 2007. The influence of Bacillus Pasteurii on the nucleation and growth of Calcium Carbonate. Geomicrobiology Journal 23 (3-4) pp. 213-226. 10.1080/01490450600724233 Cadair


Mitchell, A.C., Brown, G.H., Fuge, R. 2006. Minor and trace elements as indicators of solute provenance and flow routing in a subglacial hydrological system. Hydrological Processes 20 (4) pp. 877-897. 10.1002/hyp.6112 Cadair

Mitchell, A., Ferris, F.G. 2006. Effect of Strontium on the Size and Solubility of Calcite Crystals precipitated by Bacterial Ureolysis. Environmental Science & Technology 40 (3) pp. 1008-1014. Other Cadair


Mitchell, A., Ferris, F.G. 2005. The Co-Precipitation of Sr into Calcite Precipitates Induced by Bacterial Ureolysis in Artificial Groundwater – Temperature and Kinetic Dependence. Geochimica et Cosmochimica Acta 69 (17) pp. 4199-4210. 10.1016/j.gca.2005.03.014 Other Cadair