Iron ore producer Vale is continuing to struggle to improve the output of its Brazilian operations after a dam disaster earlier in the year. While the shortfall was initially made up for by Australian exports – which reached a record high of A$8.81 billion ($6.18 billion) in May – the outlook for iron ore globally is more challenging. S&P Global Market Intelligence’s analyst, Max Court, has identified production challenges and port constraints in Australia for Rio Tinto and BHP. There has been some improvement in Vale’s Brazilian iron ore exports in May th...