Abstract
President Sillitoe, members and friends of SEG: Julian Hemley is the Penrose Medalist for the year 1999. It is a perfect fit! Julian is the best in the world at what he does: experimental hydrothermal geochemistry aimed specifically at understanding processes of wall-rock alteration and metal deposition in ore deposits. Chuck Meyer summed it up best in 1987 while introducing Julian for the SEG’s silver medal. Chuck said, Julian’s early work has been so widely applied that many recent writers no longer document the source. His conclusions have thus received the ultimate highest accolade: they are accepted as common knowledge! Julian was introduced to ore deposits by his father, who was a prospector and independent mining man in northern Mexico. He was introduced to the challenges of geology by Howard Quinn, his professor at the University of Texas at El Paso. Bob Garrels, at Northwestern, taught him to appreciate the chemical challenges. Julian in turn produced, as a master’s thesis under Garrels, a pioneering, geologically oriented study on sulfide (galena) solubilities. After a couple of years as a Chevron research geologist, he joined Bob Fournier, Roy Woodall, me, and others in Chuck Meyer’s first class of graduate students in the old Bacon Hall basement laboratory at …
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