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Low-grade iron formation (e.g., in Minnesota). Recovery of the iron requires fine grinding and concentration of iron-bearing phases (seemineral processing), which are then formed into pellets suitable for blast furnaces. As high-grade deposits of iron ore have become depleted, taconite deposits have increased in importance.
This entry comes from Encyclopædia Britannica Concise. For the full entry on taconite, visit Britannica.com.