Jul 28, 2018 · The Valemaxclass iron ore carriers, with a capacity of 400,000 metric tons, are 362meters (1,200 feet) long and 65 meters (214 feet) wide (image via Vale). A Valemax getting the finishing touches (image via Vale): NingboZhoushan has some of the world's largest gantry cranes for offloading ore, with a capacity of around 2,500 metric tons/hour.