2 | P a g e Class 1 Location Assessment Development Site – Surface Magazine, Waihi North Project 1. Executive Summary The proposed Waihi North Project requires three new class 1 storage facilities (magazines) to service the development and production needs of the proposed operations. These areas are Wharekirauponga Underground, Willows Road Farm and the Development Site. This report covers the class 1 location assessment relating to the proposed surface magazine compound at the Development Site.’ The ‘ Health and Safety at Work (Hazardous Substances) Regulations 2017’ ’ is the key legislation that must be considered when designing, constructing and licensing a class 1 storage facility. The newly proposed facility would be deemed suitable for a total capacity of up to 6,412 kg of mixed class1 substances. The facility would utilise up to 6 individual, smaller capacity, magazine units in order to manage the size of the overpressure offsets (controlled zones). Appropriate offsets distances between magazine units (known as Inter-Magazine Distance or IMD) are maintained in order to mitigate risk of nearfield propagation between each individual magazine unit. The calculated controlled zones are therefore based upon the stored quantity (Net Explosive Quantity or NEQ in kg) in each of the six individual magazines. The stored substances at the facility would comprise of a variety of commercial explosives products that are commonly used in similar mining operations. The proposed location of the facility is shown in Figure 1. The assessment of this location considered a number of factors including environmental considerations, operational efficiency and personnel safety. The location and proposed storage quantities are deemed to be compliant with the relevant hazardous substance legislation. Controlled zone calculations have been based upon TNT equivalence (see definitions), whereby multiple grades and types of commercial explosives may be stored at the location at any given time. ‘Figure 1 – Overview of site position relative to broader operation and neighbouring properties’ NORTH kP Proposed Magazine Compound (Total capacity at 6,400 kg - NEQ) Areas shaded in blue indicate OGNZL owned land 750 m
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