Document describing a collection of records held in the Minnesota Discovery Center Archives documenting the activity of the Butler Brothers and Hanna Mining Company.
Document describing a collection of records held at the Iron Range Research Center documenting the activity of Peter Del Greco, a former United States Steel employee.
Del Greco, Peter; Chisholm (Minn.); United States Steel Corporation; Iron mines and mining--Minnesota.
Key providing information regarding the use of symbols on underground mine maps generated by and provided to the Minnesota Department of Conservation, now the Department of Natural Resources.
Cross section reveling the infrastructure of an operating underground iron ore mine. Note that the blue material that looks like it could be water, is in fact the ore body.
Iron Mining; Underground Mining; Oliver Iron Mining Company
