The agency found a 'tension crack' in the miner's tailings storage facility in the provinceBecause of the imminent danger posed by the situation, MGB ordered Greenstone to immediately stop gold ore mineral processing in the contract area under Mineral Production and Sharing Agreement No. 184-2002-XIII. The agency ordered Greenstone's mineral processing suspended until remedial measures are instituted. These measures should be certified by a third-party expert and validated by the Environmental Management Bureau. The company should also submit a report on the remedial measures undertaken within 3 days of receipt of the order and every week thereafter until the stability and integrity of the tailings facility is restored. Greenstone operates the Sianna gold project in the municipalities of Tubod and Mainit.