In the sweaty heat of northern Mozambique, Vale, a Brazilian mining giant, is digging up coal at its mine near the village of Moatize. A 400,000-tonne mound sits ready to burn. The mine can churn out 4,000 tonnes an hour but the railways and ports cannot cope. Vale is working to improve a line through Malawi to take the coal for export, oas Construtora, another Brazilian firm, has signed a deal with the miner to build part of a new port at Nacala, 1,000km (620 miles) to the north-east, to do the same.
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