West Coast miners will march through Greymouth today in a fight to keep the Spring Creek mine open. Organisers hope 500 people will join the march, in what could be the biggest protest on the West Coast since the end of native logging.

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Rio Tinto's attempt to renegotiate New Zealand's largest electricity contract, for its aluminium smelter at Bluff, comes as the company's chief executive warns of "difficult decisions" ahead.

Australia's resource boom affecting exchange rate for other exporters.