These are links to various organizations and mining companies.  Tons of information here.

Mining Companies

• ArcelorMittal
• Cliffs Natural Resources
• Essar Steel Minnesota
• Mesabi Nugget
• Steel Dynamics
• US Steel

Other Sites

• American Iron and Steel Institute
• Geology, Exploration, and Mining: 101 Exceptional Resources
• IRRRB
• Iron Range Research Center Archival Collections
• Laurentian Vision Partnership
• Minerals Education Coalition
• Mining Heritage Sites in Minnesota 
• Minnesota Department of Education
• Minnesota Department of Natural Resources - Division of Land and Minerals 
• Minnesota Department of Revenue - Mineral Tax Guides 
• Minnesota Discovery Center
• Minnesota Humanities Center - Iron Range Resources
• Minnesota Iron
• Minnesota Job Skills Partnership Program
• Minnesota Works Job Search
• NORTHFORCE
• School Trust Fund - Minnesota DNR Report on School Trust Fund
• Taconite Rocks! Curriculum

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Other Resources

• Minnesota's Iron Mining Industry History PDF
• State of the Industry Update PDF
• 2015 Mining Tax Guide PDF
• 2015 St. Louis County Mine Inspector Report PDF
• Minnesota Iron Day proclamation PDF