From Financial Times (link):
From 2000 to 2005, it accounted for more than 90 per cent of growth in seaborne iron ore trade, according to Macquarie Research. Between 1994 and 2003, China was responsible for 54 per cent of growth in global copper consumption.
While growth in demand for such commodities is set to slow, analysts say that, barring unforeseen economic mishap, China can only continue to suck in an increasing portion of global resources.