Premium Content Subscriber only Multiple reports of dangerous gas exceedances deep underground were not passed up to senior mining executives, the Queensland Coal Mining Board of Inquiry has found. The board's first part of the inquiry report, which was released on Thursday, focused on the initial tranche of public hearings held in August. The inquiry detailed the cause, reaction, internal reporting and risk mitigation of 13 high risk methane exceedances across three mines, Oaky North, Moranbah North, and Grasstree. "The combined controls of ventilation and gas drainage did not deliver the desired outcome in terms of keeping methane concentration below prescribed levels," the inquiry said.