Paul Spry


Economic Geology/Mineralogy/Metamorphic Petrology


Dept:Geological And Atmospheric Sciences
Office:256 Science Hall
Phone:(515) 294-9637


B.S. (with Honors) University of Adelaide, 1977
M.S. University of Adelaide, 1979
Ph.D. University of Toronto, 1984

Dr. Spry's research interests are in economic geology, mineralogy and petrology, and the geochemistry of metallic mineral deposits. He is particularly interested in the petrological, mineralogical, structural, geochronological (Re-Os), light (S, C, O and H) and nontraditional stable isotope, and fluid inclusion characteristics of epithermal and mesothermal gold deposits, as well as the effects of metamorphism on massive sulfide deposits. Current research projects include: the origin of metamorphosed Proterozoic base metal-gold deposits (Colorado); the origin of gold telluride deposits in Greece; the use of trace elements in oxides, silicates, and sulfides as exploration guides to metamorphosed Cu-Pb-Zn-Ag ores in the Kanmantoo Group, South Australia and the Stollberg Pb-Zn-Ag ore field, Sweden; the origin of nodular sillimanite rocks and their genetic relationship to metamorphosed massive sulfide deposits; and the crystallographic characterization of precious metal sulfides and sulfosalts (see new sulfosalt “Spryite” named after Spry).

Research Projects
  1. Trace element chemistry of common silicates (garnet, biotite, staurolite, chlorite), oxides (gahnite, magnetite), and sulfides (pyrite, pyrrhotite, chalcopyrite, and sphalerite) as guides in the exploration for metamorphosed Proterozoic massive sulfide deposits in the the Bergslagen district (Sweden) and central Colorado
  2. The mineralogy and geochemistry (fluid inclusions and stable isotopes) of epithermal and mesothermal gold deposits and porphyry style copper and/or molybdenum deposits, Greece (with Panos Voudouris, University of Athens; Vasilios Melfos, Aristotle University of Thessaloniki)
  3. Mineralogy and crystallography of sulfides, sulfosalts, and tellurides (with Luca Bindi, University of Florence)

Google Scholar Profile

  • Geol 105 - Gems and Gemstones
  • Geol 316 - Optical Mineralogy
  • Geol 365 - Igneous and Metamorphic Petrology
  • Geol 420/520 - Mineral Resources
  • Geol 507 - Midwestern Geology Field Trip
Detailed Course Descriptions

Recent Refereed Publications

Roberts, J.A., Groat, L.A., Spry, P.G., and Cempírek, J., 2021. Telluride mineralogy at the Deer Horn Au-Ag-Te-(Bi-Pb-W) deposit, British Columbia: Implications for the generation of tellurides. Canadian Mineralogist, in press.

Spry, P.G., and Teale, G.S., 2021. A classification of Broken Hill-type deposits: A critical review. Ore Geology Reviews,, 26 p.

Voudouris, P., Melfos, V., Mavrogonatos, C., Photiades, A., Moraiti, E., Rieck, B., Kolitsch, U., Tarantola, A, Scheffer, C., Morin, D., Vanderhaeghe, O., Spry, P.G., Ross, J., Soukis, K., Vaxevanopoulos, M., Zaimis, S., Magganas, A., Kati, M., and Katerinopoulos, A., 2021. The Lavrion mines: a unique site of geological and mineralogical heritage. Minerals, 11, 76., 22 p.

Stergiou, C.L., Melfos, V., Voudouris, P., Spry, P.G., Papadopoulou, L., Chatzipetros, A., Mavrogonatos, C., Filippidis, A., 2021. The geology, geochemistry and origin of the porphyry Cu-Au-(Mo) system at Vathi, Serbo-Macedonian Massif, Greece. Applied Sciences, 11, 479, 39 pages.

Kelley, K.D., Spry, P.G., McLemore, V.T., Fey, D.L., and Anderson, E.D. 2020. Alkalic-type epithermal gold deposit model. U.S. Geological Survey Scientific Investigations Report, 2010-5070-R, 74 p.

Kadel-Harder, I.M., Spry, P.G., Layton-Mathews, D., Voinot, A., von der Handt, McCombs, A.L., 2020. Paragenetic relationships between low and high-grade gold mineralization in the Cripple Creek Au-Te deposit, Colorado: trace element studies of pyrite. Ore Geology Reviews,, 24 p.

Kadel-Harder, I.M., Spry, P.G., McCombs, A.L., and Zhang, H., 2020, Identifying pathfinder elements for gold in bulk-rock geochemical data from the the Cripple Creek Au-Te deposit, Colorado: A statistical approach. Geochemistry: Exploration, Environment, Analysis,, 17 p.

Mavrogonatos, C., Voudouris, P., Zaccarini, F., Klemme, S., Berndt, J., Tarantola, A., Melfos, V., and Spry, P.G., 2020, Multi-stage introduction of precious and critical metals in pyrite: A case study from the Kponos Hill and pagoni Rachi porphyry/epithermal prospects, NE Greece. Minerals 10, 784: doi103390/min10090784.

Melfos, V., Voudouris, P., Melfou, M., Chansez, M., Papadopoulou, L., Filippidis, A., Spry, P.G., Schaarschmidt, A., Klemd, R., Haase, K.M., Tarantola, A., Chelle-Misou, C., Mavrogonatos, C., 2020, Mineralogical constraints of the potassic/sodic-calcic hydrothermal alteration at the porphyry Cu-Mo±Re±Au mineralization in Maronia, NE Greece. Minerals, v. 10 (182), doi:10.3390/min10020182.

Full Publication List