Reserves (iron ore and coal) – ArcelorMittal
At ArcelorMittal mining operations, proven iron ore reserve estimates are typically based on drill hole spacing ranging from 25m x 25m to 100m x 100m, and probable iron ore reserve estimates are based on drill hole spacing ranging from 50m x 50m to 300m x 300m. As of December 31, 2018. As of December 31, 2017.