OttawaRocks:
Cliffs United Taconite mine, Minnesota Oct 2010
OttawaRocks:
Cliffs United Taconite mine, Minnesota Oct 2010
OttawaRocks:
Cliffs United Taconite mine, Minnesota Oct 2010
OttawaRocks:
Cliffs United Taconite mine, Minnesota Oct 2010
OttawaRocks:
Lake Superior North Shore beach Minnesota
OttawaRocks:
Lake Superior North Shore beach Minnesota
OttawaRocks:
Lake Superior North Shore Minnesota 2010 (4)
OttawaRocks:
Quartz crystals from Soudan iron mine, Minnesoata. 2010
OttawaRocks:
Banded iron formation, doubly folded, Soudan iron mine, Minnesota
OttawaRocks:
Banded iron formation, doubly folded, Soudan iron mine, Minnesota
OttawaRocks:
Banded iron formation, doubly folded, Soudan iron mine, Minnesota
OttawaRocks:
Banded iron formation, doubly folded, Soudan iron mine, Minnesota