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Iron ore - Wikipedia
Iron mining in the United States - Wikipedia
Iron Ore Statistics and Information | U.S. Geological Survey - USGS.gov
The 10 Largest Iron Ore Mines in the World - WorldAtlas
Mapped: US mineral production, by state - MINING.COM
Iron processing | Definition, History, Steps, Uses, & Facts | Britannica
Five largest iron ore mines in US in 2020 - Mining Technology
RANKED: World’s top 20 biggest iron ore operations
Iron processing - Ores, Smelting, Refining | Britannica