Waihi Emergency Principal Control Plan Approved by: General Manager/SSE Approval Date: 26/03/2021 Next Review:26/03/2022 OceanaGold Waihi WAI-250-PLN-001 Page 23 of 124 Communications Underground Operations 9.2.1 Radio Channels (VHF) The main form of communication underground is via radio on the following channels: Table 5 Radio Channels (VHF) Channel Purpose Area Covered Channel 1 Emergency All Channel 2 Underground chat channel Underground Channel 3 Smart Centre Underground Channel 4 General Underground Channel 5 Underground Workshop Underground 9.2.2 Underground Telephone Communication Telephones are located in all refuge chambers, except for the portable refuge chambers. Telephones are generally used during an emergency for phoning in your location when you have evacuated to refuge chambers. 9.2.3 Stench Gas The Waihi underground mine has an emergency stench gas system that is utilized to warn personnel of the need to evacuate. Release of stench gas will be determined and arranged by the emergency Underground Tag Board Controller. The release points are at the tag board (button), mill control (SCADA) or each unit has a manual release valve. Radio Silence All personnel not directly involved in an emergency should maintain radio silence, unless requested to do otherwise. After the emergency has ceased, the Underground Tag BoardController, Chief Warden or Mine Incident Controller is to announce over the RT that the emergency has ended and normal radio traffic may resume. External Communications & Consultations The Senior Site Executive will ensure the existence and maintenance of the Emergency Management Control Plan and that an overview of the content of the Plan is communicated to all site personnel, including contractors, who are required to undertake work in the Waihi operational areas. The processes shall ensure that operators are provided with an understanding of emergency management control processes, related issues/incidents and any relevant changes in procedures prior to implementation. This control plan has been developed in conjunction with the following agencies: • Police • FENZ • Civil Defense • St Johns Ambulance • New Zealand Mines Rescue Service • OGL Crisis Management Team
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