Dear SEG friends and guests: Every now and then a university professor has the good fortune to work with an exceptional student. I am such a professor and the exceptional student in the mid- to late 1980s was Mark Hannington, this year’s SEG Silver Medalist.

I somehow convinced Mark to come to Toronto for graduate studies (actually, I bribed him by offering submersible dives). Mark was a member of a small team I had put together to explore the deep sea floor for hydrothermal sulfide deposits as natural laboratories for better understanding volcanic-hosted massive sulfide (VMS) ores that formed on...

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