Shipments of iron ore on the Great Lakes totaled 4.6 million tons in December, a decrease of 4.5 percent compared to a year ago. Shipments were just slightly above the 5-year average for the month.The year-end total for the iron ore trade stands at 49.8 million tons…<p><p>https://www.marinelink.com/news/great-lakes-iron-ore-trade-down-percent-534306</p></p>