Australian government is going to impose a new regulation under which the largest mining companies will be obliged to pay 30% tax. The law has already passed through the lower house and is expected to be approved by upper senate in the beginning of 2012. The tax will come in force in July next year. Under the tax giant companies like Rio Tinto and BHP Billiton will be forced to pay more than $11bn Australian dollars in the three years of new regulation.