Waihi North Project Preliminary Site Investigation (Ground Contamination) Williamson Water & Land Advisory Limited Date Location Product Event description Significance N M S shut down the machine and noticed oil leaking from underneath the excavator. He put soaker pads down to control the spilt oil (65 litres). 7 March 2011 Production Area - Waihi NaCN 3mm hole spraying mud outside of bunded area approximately 30 litres at 300ppm NaCN. Area drainage reports to Mill Contingency Pond. 28 January 2013 Production Area - Waihi WTP operator discovered ferric pump 9238 had a bad leak on intake side of pump. Lost approx. 1000 litres to inside bunded area and pumped to tails hopper via sump pump. $1820 worth of product. 28 January 2013 Production Area - Waihi At 1504 hrs, bunk ferric bund high level alarm was activated. Investigation revealed split in transfer pump pipe work. Approx. 800L lost to bund. $1456 worth of product. 10 June 2013 Production Area - Waihi At 1351hrs, site was notified (via email with pictures attached) that an empty Isotainer had leaked product onto the ground in storage yard. 3 personnel collected testing, monitoring and Spill clean up equipment and dispatched to investigate. At 1430hrs, informed that the Isotainer had already been moved to the Port of Tauranga, so NWG personnel proceeded to there. 11 June 2014 Production Area - Waihi oil While a Fitter was checking the level of oil in the chain case of the Mustang - he removed the drain plug, and approximately 4 litres of oil squirted out from the chain case. Oil splashed onto operators overalls. 15 January 2015 Production Area - Waihi sodium cyanide solution Mechanical seal failure on pump released approximately 900 litres of 30% sodium cyanide solution into the bund. 9 July 2015 Wastewater treatment plant Upon arrival at WTP at beginning of shift, operator has discovered hose off ring main has become uncoupled from stream 4 dose pump. Spill contained within bunded area of stream 4 and WTP. lost approx. 375kg @ 174.4/t 18 October 2015 Waihi hydraulic oil While loading the bucket of the 770 loader, a hydraulic line has blown. 17 August 2016 Wastewater treatment plant Contaminat ed water – unknown contaminan ts Manhole MH13 overflowing contaminated underdrainage water. Water flowed to S4 collection pond. Contaminated water was then pumped from S4 to WTP 30 November 2016 Cyanide Foam Spilled out of Bulk Cyanide Mix Tank into bund via the tank overflow pipe and level indicator hole 20 December 2017 Waihi Diesel "McFalls delivery driver arrived at site to fuel Aggreko generator fuel tank. McFalls driver began fuelling as per normal procedure. After ~9000L transferred it was noticed that diesel was leaking out of the top of the tank. Immediately stopped fuelling. At this time the Aggreko technician's arrived and informed McFalls driver that the fuel tank was not operational." 3 March 2021 Production Area - Waihi Oil Maintenance fitter was manoeuvring Carbon Catch Screen Feed Box around outside workshop when approx. 200L of slurry discharged from an inlet spool piece onto tarseal
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