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Mine giant expands Top End manganese operation

The world's biggest mining company will expand its manganese operation at Groote Eylandt in the Northern Territory.BHP Billiton announced the $254 million expansion of the GEMCO mine in a statement this morning. The company says this expansion will increase production from 4.2 to 4.8 million tonnes of ore a year.

Carbon tax threatens Vic economy: Baillieu (AAP)

The federal government's carbon tax will jeopardise the reliability of Victoria's power supply, drive energy prices higher and cost jobs, the state government says.Premier Ted Baillieu said the tax was a direct threat to the state's electricity supplies,

BHP drags market lower

Local shares have closed lower, dragged down by losses in Australian mining giant BHP Billiton.The market also had a weak lead from overseas markets, after Federal Reserve chairman Ben Bernanke deflated investors' stimulus hopes.The All Ordinaries