HIBBING, Minn. (AP) — Cliffs Natural Resources Inc. says a rail logjam is forcing the company to immediately begin using trucks to transport iron ore pellets from Hibbing Taconite to the Duluth port.

In a statement Friday, the Cleveland-based mining company said the move is a way to ensure its customers on the lower Great Lakes will have an adequate supply of pellets to maintain operations before the shipping season closes.