United States - Relative Importance Weights (Contribution to the Total Industrial Production Index): Mining, Quarrying, and Oil and Gas Extraction: Iron Ore Mining (NAICS = 21221) was 0.08% in December of 2023, according to the United States Federal Reserve. Historically, United States - Relative Importance Weights (Contribution to the Total Industrial Production Index): Mining, Quarrying, and Oil and Gas Extraction: Iron Ore Mining (NAICS = 21221) reached a record high of 0.25 in October of 1974 and a record low of 0.01 in June of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for United States - Relative Importance Weights (Contribution to the Total Industrial Production Index): Mining, Quarrying, and Oil and Gas Extraction: Iron Ore Mining (NAICS = 21221) - last updated from the United States Federal Reserve on April of 2024.