Waihi North Project Preliminary Site Investigation (Ground Contamination) Williamson Water & Land Advisory Limited Date Location Detail Significance N M S 20 November 2017 MCC 3 Smoke in MCC 3 set off VESDA (Early smoke/ fire detection system) which alarmed to Mill Control then shortly after second stage activated the fail safe power disconnect circuit shutting down the Mill site power . 7 March 2018 Electrical workshop A battery was being load tested in the electrical workshop using a 12volt siren/beacon assembly as the load. While being powered by the battery the beacon portion of the assembly caught fire. 17 March 2018 ROM pad "A contract digger operator had completed a pre-start on the contractors machine and was allowing machine to warm up when he noticed smoke coming from engine bay. The operator opened side door on hydraulic pump side and saw flames in the engine compartment. operator went to drivers side of the machine and isolated machine and grabbed Fire extinguisher, returned to hydraulic side door and extinguished fire. Opened engine cover to ventilate engine bay and check fire fully extinguished. Table A.1.5. OGNZL Records – Spill Events Date Location Product Event description Significance N M S 28 September 2009 Production Area - Waihi H2O2 H2O2 delivery contractor over filled one of the two WTP storage tanks. Bund area drain reported the chemical to the conveyor belt wash settlement ponds. H2O2 started to decompose (producing water & oxygen) in two of the ponds before overflowing in to the WTP CP. Potentially 370 litres of product spilt. Belt wash pump stopped and WTP personnel monitoring WTP CP. 15 March 2010 Production Area - Waihi Not stated Weight of inline filter and outlet fittings (which is all unsupported) broke plastic fitting on ibc Spilling 400 litres into its bund. However valve open so from there to sump pump to thickener. 22 September 2010 Support Area - Waihi Oil Oil leak from generator unit. Agrekko generator malfunction estimate 100 l engine oil sprayed out from generator - covering an area up to 30m2. Location: Favona workshop. 29 October 2010 Support Area - Waihi Oil Oil leak/blown hydraulic hose. While overseeing a broken hills ore delivery the hydraulic line between the first and second trailer burst causing approx 40l of fluid to be dropped. 27 December 2010 Support Area - Waihi CNwad Thickener tank partially emptied into secondary containment which in turn partially discharged via flocculent shed wash down pipeline to mill area drain system. Thickener tank water feed is from the process water tanks / tsf1a decant (tsf1a cnwad concentrations over the last two months ranged between 3.1 to 8.7ppm). Initiating event: thickener standby pump isolation valve solenoid malfunctioned resulting in valve failing in open position. Slurry vol estimated to be between 2m3 and 10m3. 10 November 2010 Production Area - Waihi Not stated Alarm went at 95%, truck driver came up to control room and said he had 180l to go and ask if it was okay to keep filling. The level was discussed and it should have fitted with 150l to spare. Approx 50l Spill. 18 January 2011 Support Area - Waihi hydraulic oil Blown o-ring on hydraulic pump. 52 tonne excavator was loading trucks on waste stockpile when the operator smelt hydraulic oil, he
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