Shipments of limestone from U.S. quarries on the Great Lakes decreased 8.1 percent from May of last year to 2.7 million tons. May’s loadings were also below the month’s 5-year average by 5.4 percent.Year-to-date, the Lakes U.S. limestone trade totals 3.9 million tons…<p><p>https://www.marinelink.com/news/lakes-us-limestone-trade-down-may-539876</p></p>