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Dean Peterson in the upper SKI gravel pit, Trip 5 (photo courtesy Karl Everett) |
Terry Boerboom and Laurel Woodruff Mesabi Black quarry, Trip 5 (photo courtesy Karl Everett) |
Mesabi Black quarry, Trip 5 (photo courtesy Karl Everett) |
Mesabi Black quarry, Trip 5 (photo courtesy Karl Everett) |
Dean Peterson at Stop 4, Trip 5 (photo courtesy Karl Everett) |
Terry Boerboom, Klaus Schultz and Laurel Woodruff, Stop 4 of Trip 5 (photo courtesy Karl Everett) |
Stop 6 of Trip 5 (photo courtesy Karl Everett) |
Dean Peterson at Stop 9, Trip 5 (photo courtesy Karl Everett) |
Field trip 1 - participants in Thunderbird North taconite mine (photo courtesy Mark Jirsa) |
Field trip 1 - some participants at a waterfalls in the historic Fayal mine (1895-1965), now part of the Thunderbird South taconite pit (photo courtesy Mark Jirsa) |
Field trip E - canoe launch into flooded "natural ore "(hematite-geothite) mine near Chisholm. (photo courtesy Mark Jirsa) |
Field trip E - participants view fold structure in the mine that might have been related to oxidation and the formation of natural ores (photo courtesy Mark Jirsa) |
Field trip 1 - Mary Ellen mine, now drained in preparation for taconite mining (photo courtesy Mark Jirsa) |
Field tripo 1: stromatolite mounds exposed in the Mary Ellen mine (photo courtesy Mark Jirsa) |
Field trip 7 - Bill Rowell (Vermillion Gold, Inc.) explaining geology, alteration, exploration history, and gold mineralization in the Virginia Horn (photo courtesy Mark Jirsa) |
Drilling barge in Rouchleau natural ore mine near Virginia; geotechnical drilling underway for reroute of Highway 53 in preparation for taconite mining of current highway corridor (photo courtesy Mark Jirsa) |
Aubrey Lee points out magmatic relationships at "Confusion Hill," also known as Laurentian wayside rest area north of Virginia (photo courtesy Mark Jirsa) |
Laurel Woodruff receives her Goldich medal from Bill Cannon (photo courtesy Mark Jirsa) |