Goldminers unveil huge writedowns as prices dive FALLING commodity prices will lead to up to $640 million in writedowns by resource companies Evolution Mining and OZ Minerals, with further impairments tipped to flow as reporting season continues. Sydney-headquartered Evolution, which runs five goldmines in Queensland and Western Australia, said it would incur an impairment of $350m-$400m over its assets on the back of weakness in the gold price in recent months.