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Hawley Medal 2021

The Hawley Medal is awarded to Drs. Andrew J. Kaczowka (Cameco Exploration), T. Kurt Kyser (deceased, formerly from Queen’s University); Tom G. Kotzer (University of Saskatchewan); Matthew I. Leybourne and Daniel Layton-Matthews (Queen’s University) for the best paper published in The Canadian Mineralogist in 2021 and entitled:


The Canadian Mineralogist, September 2021; Vol. 59, part 5, 813-845.

The winning paper describes a robust technical approach to characterizing the mineralogy and geochemistry of the polymetallic unconformity-related Cigar Lake uranium deposit (Saskatchewan, Canada).  Elements of concern for both uranium metallurgical processing and the downstream environment were identified.  A wide range of analytical techniques were used for the mineralogical characterization including X-ray diffraction (XRD), scanning electron microscopy with mineral liberation analysis (SEM-MLA) to determine mineral proportions, and electron microprobe analysis (EMPA) to quantify elemental substitutions of the mineral phases.  Finally, the spatial distribution of the elements of concern and their mineral hosts were outlined in plan view sections across the deposit using
geostatistical modelling software – a key outcome linking the geology to the process metallurgy of the deposit.  The success of this holistic geometallurgical approach integrating geochemical, mineralogical, geological and geospatial characteristics of the Cigar Lake deposit makes this paper an outstanding contribution to the 2021 Canadian Mineralogist.

Andrew Kaczowka completed his BSc with honours at the University of Regina in 2010 and his MSc at Queens University in 2018. He has worked at Cameco Corporation for the past 12 years as a Sr. Mine Site Geologist and more recently a Sr. Exploration Geoscientist.

Andrew worked at the Cigar Lake uranium mine from 2013 to 2021 where he was a strong proponent of using and integrating geological, geochemical, and mineralogical data to optimize mining and milling. Andrew’s current work and research focus is on ore deposit metallogeny, exploration geochemistry, and geospatial modeling. Andrew is an avid uranium explorer hoping to contribute to the discovery of new economic deposits.


Thomas G. Kotzer was a professional geoscientist with over 30 years of experience in industry and academia. His main interests are associated with the global application of advanced technologies to understand complex geochemical, mineralogical and hydrogeologic relationships within nuclear power generation and radioactive material storage, mineral exploration, and mining. Within this, he held senior scientific, technical management and oversight positions at Atomic Energy of Canada, Canadian Light Source, Cameco Mining and Exploration, AEL-AMS Laboratories and SRK Consulting. Throughout his career, he maintained an active and ongoing relationship with academia as an adjunct professor, graduate student mentorship and supervision and provided field support and funding to collaborative academic research programs.

Matthew Leybourne is a Professor of Geochemistry and Analytical Geochemistry in the Department of Geological Sciences and Geological Engineering at Queen’s University, Kingston, Ontario. His research is focused on developing new analytical methods especially related to solution and laser ablation ICP-MS and low-level trace element determinations, the geochemistry of fluids associated with ore deposits (groundwater, marine water, and hydrothermal systems), geochemical exploration, the petrogenesis of igneous rocks, and the timing of the onset of Plate Tectonics. Matt is Co-Director of the Queen’s Facility for Isotope Research (QFIR) and is a faulty member of the Arthur B. McDonald Canadian Astroparticle Physics Research Institute in the Department of Physics, Astronomy and Engineering Physics.

Daniel Layton-Matthews has been a faculty member at the Department of Geological Sciences and Geological Engineering at Queen’s University and a co-director of the Queen’s Facility for Isotope Research (QFIR) since 2007. His research group has focused on the physical and chemical dispersal of elements in the near-surface environment with an emphasis on ore systems. He has a global collaborative research program that has strong ties with industry, government, and academic researchers that has involved the supervision of 103 BSc, MSc and PhD students. Dan received a MAC scholarship in 2002, has served as a MAC councilor from 2003-2005, the recipient of the GAC Harvey Gross Award and a Distinguished Lecturer Awardee for the Association of Applied Geochemistry. Dan’s current research group is focused on the mobility and deposition of metals and metalloids and developing methods for the measurement of isotopic ratios and element contents in complex Geological and Biological Media.

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