Waihi Underground Explosive Principal Hazard Management Plan Approved by: SSE/ General Manager Approval Date:11/05/2021 Next Review: 08/04/2022 OceanaGold Waihi Document ID: WAI-400-PLN-007 Page 13 of 27 5.3 Access, Security and Capacity of Magazines The magazines at Waihi Underground operation are located on the surface. Access to the magazine is restricted to approved underground and explosives supplier personnel only. The keys to the facility are kept with the Shift Supervisor and Production Engineers and a register is kept of the keys being signed in and out. A point to point laser system is armed and monitored by security personnel. The access road and magazine facilities have appropriate signage as stipulated in the relevant site procedure. Dry chemical powder extinguishers are provided in the magazine yard with accompanying signage. All magazines must have relevant location test certificates issued by a test certifier. Due to the proximity of the mill, stores and residential housing the magazines have capacity limits. These certificates are displayed in the magazines and it is the responsibility of the Production Engineer that these limits are not exceeded. 5.4 Magazine Rules The explosive magazine has a location test certificate which implies consent with all relevant standards and regulations. The magazine rules are as follows: • Magazines are to be kept locked, only authorised persons may unlock the magazines • A person must not smoke or bring any other items likely to cause fire or explosion, within 15 metres of any magazine • Mobile phones, pagers, handheld two-way radios or other electronic transmitting equipment must not be taken into a magazine • A person is not to enter the magazine, be in the vicinity of a magazine or handle explosives if under the influence of drugs or intoxicating liquor • No persons under 18 years of age are permitted to enter a magazine • A person shall not wear footwear, which has an outer covering consisting wholly or partly of iron or steel • All explosives movements in and out of the magazines are to be recorded in the explosives logbook • All explosives are stored according to all statutory regulations and site procedures • Blasting agents, explosives and detonators are to be segregated appropriately • Explosives shall be used in the order of the date of manufacture, the oldest explosives being used first (opened or damaged boxes of explosives should be used before any other boxes) • All box stacks are not to exceed two metres in height. Where there is a risk of the packaging being damaged by compression, the explosive should be stacked accordingly • The gap between the magazine wall and packaged explosives shall be no less than 50mm, to allow adequate ventilation between the wall and boxes • No “HOT WORK” (i.e. grinding, welding etc.) will be performed in or near a magazine without the approval of the Underground Mining Manager • Prior to disposal of any packaging it shall be inspected for any remaining explosives, split and flattened • The surroundings of a magazine are to be kept free from dry grass or other combustible or flammable materials to a distance of 10 metres, standing timber is to be cleared for a distance of 30 metres and vegetation to 15 metres • Housekeeping should be of a standard that ensures good access/egress, clear access to all fire extinguishers and elimination of any trip hazards • If an explosive spills or leaks, the approved handler must ensure the spillage is removed and disposed of immediately • The Approved Handler must ensure that when a motor vehicle is in the vicinity of a magazine and the engine of the vehicle is running, the door of the magazine is closed
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