Spending on mineral and petroleum exploration in Western Australia rose by 39 per cent to $839.2 million in the 2006-2007 financial year, accounting for nearly half of the nation's total, according to the Australian Bureau of Statistics.

Spending on mineral and petroleum exploration in Western Australia rose by 39 per cent to $839.2 million in the 2006-2007 financial year, accounting for nearly half of the nation's total, according to the Australian Bureau of Statistics.