John Mahoney, Ph.D., Principal Geochemist at MGC, has over 35 years experience in the fields of Environmental Aqueous Geochemistry.  He completed his Ph.D. in Geochemistry from the Colorado School of Mines in 1989.  Dr.  Mahoney has worked at numerous mining and industrial sites in the United States, Canada, Brazil, South Africa, Indonesia, Kuwait, Tanzania, Ghana, Botswana and Peru.   He specializes in applied geochemical modeling and uses various programs and models depending upon project needs.  He has particular expertise in preparing models of pit lakes.  He has a wide range of experience in evaluating the fate and mobility of metals in ground water systems.  He specializes in the geochemistry of arsenic and uranium, but has dealt with many other elements including barium, radium, cadmium, lead, copper, chromium, and actinides.  

He has developed short courses on geochemical modeling including a two day course at the 2000 ICARD Conference. He was also invited to instruct at courses held at the University of Alberta (Edmonton) in 2006 and 2008.  He has also prepared several client specific training sessions on Acid Rock Drainage, and Geochemical Modeling. Since 2010 he has presented numerous short course at various locations.