Tightening of supplies of iron-ore from global resource majors has triggered a spike in outward shipments of the steelmaking raw material through Indian ports and also put low grade fines back in favour with global steel mills. According to data sourced from the Indian Ports Association, outward bound iron-ore traffic, including pellets, was up 15.33% during April to June, compared with the corresponding period in the previous financial year, at 12.188-million tons.