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Apologies, forgot to paste it when submitting: https://en.wikipedia.org/wiki/Mary_River_Mine https://en.wikipedia.org/wiki/Mary_River_Mine There are some known

• gus_massa 2y ago
  From https://en.wikipedia.org/wiki/Mary_River_Mine https://en.wikipedia.org/wiki/Mary_River_Mine > with its four massive iron ore deposits of 65-70% pure iron ore From https://en.wikipedia.org/wiki/Iron_ore https://en.wikipedia.org/wiki/Iron_ore > Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red. The iron is usually found in the form of magnetite (Fe_3O_4, 72.4% Fe), hematite (Fe_2O_3, 69.9% Fe), goethite (FeO(OH), 62.9% Fe), limonite (FeO(OH)·n(H_2O), 55% Fe), or siderite (FeCO_3, 48.2% Fe). > *There are some known techniques to deoxidize iron from the medieval and renaissance periods, [...]. I agree. To deoxidize iron you must heat it to a few thousand degrees and mix it with coal, so the carbon in the coal steals the oxygens in the ore and you get metalic iron. (I'm oversimplifiying, and ignoring a lot of details that I don't even know.) It's not easy and not cheap.