Oliver Iron Mining CompanyA map of the 12th level at the Soudan Mine starting from the No. 8 Shaft going west and east towards the Alaska Shaft. The map shows the drifts, cross cuts, rock formations, raises, core sample drill holes, and stope areas. Lake Superior Datum.JPEGengPublicBusiness and industrySoudan Mine, No. 8 Shaft, 12th Level, Soudan, MinnesotaMapsMinnesota--SoudanMinnesota--Saint Louis County1937-01-01 - 1950-01-01University of Minnesota