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  1. Iron ore - Wikipedia

  2. Iron mining in the United States - Wikipedia

  3. Iron Ore Statistics and Information | U.S. Geological Survey - USGS.gov

  4. The 10 Largest Iron Ore Mines in the World - WorldAtlas

  5. Mapped: US mineral production, by state - MINING.COM

  6. Iron processing | Definition, History, Steps, Uses, & Facts | Britannica

  7. Five largest iron ore mines in US in 2020 - Mining Technology

  8. RANKED: World’s top 20 biggest iron ore operations

  9. Iron processing - Ores, Smelting, Refining | Britannica