Finance Minister Nicola Willis criticised Shane Jones for a $30,000 budget blowout at a Canadian mining conference. Photo / Mark MitchellFinance Minister Nicola Willis criticised Shane Jones for a $30,000 budget blowout at a Canadian mining conference. Photo / Mark Mitchell

Jones defended the expenses, blaming officials and booking errors for the overspend. Photo / Mark MitchellJones defended the expenses, blaming officials and booking errors for the overspend. Photo / Mark Mitchell