10 | P a g e Class 1 Storage Location Assessment_Oceana Gold NZ Ltd Wharekirauponga Underground Mine ‘Figure 6 – Aerial view of surface connection ‘P0 and P1’ on OGNZL property’. Site P2 – WUG FAR #1 (Latitude - 37°18'19.64"S, Longitude - 175°49'19.89"E) The WUG Fresh Air Return #1 is proposed to have a diameter of up to 5.5 m and be located within the HDC paper road boundary in a remote forested area. The proposed location will consist of a 10 m x 10 m area with a perimeter fence restricting access to members of the public. In the event of an emergency situation, any OGNZL site personnel within the perimeter fence will be managed by way of ERP. All controlled zones at this location are less than 3.8 m from edge of the shaft. No infrastructure is present at this location that could be affected by controlled zones. Based upon the proposed maximum stored capacity of 1000 kg (NEQ per chamber), the calculated controlled zone offset distance relevant to members of the public (13 kPa) is 2.3 m at this site. Given the publicly excluded area is limited to 10 m diameter, to achieve regulatory compliance with the 13 kPa limit at this location it is proposed that either: • The vent shaft diameter be limited to 5.25 m; or; • The stored quantity of explosives per magazine be limited to 950 kg (NEQ). A combination of the above elements may also be considered during the final design phase of the project, whereby a moderate reduction in both shaft diameter and stored capacity could be implemented to achieve compliance with the 13 kPa limit. However, if a reduction in maximum capacity for magazine chambers is considered, it will be based upon ‘Site P3’ where the controlled zone offset distance relevant to members of the public is greatest. Site P0 – Willows Road Farm Portal NORTH kP 320 m Site P1 – Willows Road Farm Fresh Air Intake Forested area within green border is DOC Reserve. Sites ‘P0’ and ‘P1’ are located within OGNZL owned property
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