World total (rounded) 2,450,000 2,400,000 1,520,000 1,500,000 180,000 84,000 . World Resources : 6. U.S. resources are estimated to be 110 billion tons of iron ore containing about 27 billion tons of iron. U.S. resources are mainly low-grade taconite-type ores from the Lake Superior district that require beneficiationWeb