Brendon Grylls is going to the state election with a mining tax proposal he says will recoup the government an extra $2.3bn a year – and the industry is escalating its campaign to oust him

BHP Billiton’s iron ore is loaded in Port Hedland
BHP Billiton’s iron ore is loaded in Port Hedland. A proposal for a mining tax by local MP Brendon Grylls has been countered by a $5m advertising campaign by the mining lobby. Photograph: BHP Billiton