IGO SUSTAINABILITY REPORT 2020

Transport, dust and emissions We recognise that some of our activities can impact the amenity of the environment and our host communities. The nature of resource extraction, primary processing, transportation of our products, and ship loading for export can result in dust, noise and pollutant emissions. Truck transport is an important logistics component of our operations, delivering consumables and our products along the supply chain. Truck traffic within regional areas is a concern for the public, and we work closely with our transport partners and local communities to understand our impacts and improve our practices. IGO seeks to minimise truck traffic through regional towns. We aim to ensure that the resources we produce are properly managed when in our control and we work with our stakeholders in the supply chain to manage any impacts on the communities in our transport route. We have mechanisms to record and respond to complaints around such issues as dust, noise and truck movements. During FY20, we received no community complaints concerning the transportation of our consumables or products. During the community social impact assessment undertaken in FY19, the key concern highlighted by the broader Esperance community was the potential for dust emissions from loading activities at the Southern Ports, Port of Esperance. Working with our transport and logistic partners, we put in place procedures and monitoring to mitigate dust emissions and operate to an exemplary standard to secure community confidence and maintain our social licence to operate. In FY20, after three years of IGO shipments through the Port of Esperance, the Port has had no licence exceedances in respect of dust emissions related to our product. Extensive data collected at the boundary of the Port and a reference site in town show levels of respirable nickel were five times less than the target limit prescribed by the regulator. Our data is regularly published and is publicly available on the Southern Ports, Port of Esperance webpage https://www. southernports.com.au/. Ongoing monitoring and strict loading controls will be maintained and continue for all future IGO shipping events. At our Nova Operation, our main activities involving resource extraction and primary processing result in the release of emissions and particulates to the atmosphere. Our major air emissions are carbon monoxide, oxides of nitrogen, sulphur dioxide, and volatile organic compounds. IGO completes annual National Pollutant Inventory (NPI) reporting in accordance with the Australian Government regulations to disclose these emissions. NPI is used to track pollution across Australia, and ensures our community have access to information about the emissions and transfers of toxic substances which may affect them locally. Data on the key reportable pollutants for FY20 are included in the performance data table on page 97, and in our Response to Climate Change section on page 65. Water management The increasing pressure on global freshwater resources is a well- recognised concern for many stakeholders. Water is a critical resource and its effective management is fundamental to the sustainability of IGO’s operations, and the ecosystems and communities in which we operate. We use water in all parts of our business. We acknowledge the potential of our operations to impact water resources and take a proactive approach to responsible water management, as a minimum we comply with all regulatory requirements. In Western Australia, water abstraction is subject to a licence issued by the Department of Water and Environmental Regulation (DWER). In FY20, we were compliant with our licence obligations and actively monitor abstraction volumes and groundwater levels to ensure ongoing compliance. IGO relies on the withdrawal of available groundwater at our Nova Operation and exploration projects, due to the remote nature of these activities. The GWW surrounding the Nova Operation is characterised by low relief paleo drainage systems, with no defined rivers, and several ephemeral creeks and watercourses. Salt lakes are relatively common across the GWW. Groundwater typically occurs in aquifers close to the surface, which are recharged by direct rainfall infiltration. The groundwater is typically saline to hypersaline. There are no competing users of the water resource in the vicinity of the Nova Operation, with the nearest other users being pastoralists approximately 25km from the mine. In FY20, we completed a project to review and develop an improved all-of- site water balance. We actively manage and track our water inputs, consumption and outputs, which are depicted in our water balance graphic and also disclosed in our performance data on page 97. We continue to look for opportunities to improve the efficiency of our water usage. Unintended safety and environmental impacts can result from both poorly managed groundwater abstraction and the uncontrolled release of contaminated water, particularly hypersaline water. There were no reported or significant material spills or unapproved discharges from our operations in FY20. Based on available science, the woodlands surrounding the mine do not rely on tapping into the saline aquifers utilised by the mine. We complete annual vegetation impact assessments to determine if our abstraction is impacting vegetation health and monitor groundwater levels to check changes in levels and chemistry. To date, vegetation monitoring indicated that neither groundwater drawdown nor mounding has had an impact on the overlying forest. Further, as the groundwater is hypersaline, it is likely that few higher organisms, if any, rely on groundwater as a water source. Wastewater is managed by a recycled water scheme with the approval of the Western Australian Department of Health. Nova’s Wastewater Treatment Plant recycles all grey and black water produced by the accommodation camp, power plant, paste plant and other non- processing infrastructure on site. Decant water stored in the TSF is recycled and reused in the processing plant. 877.9ML of water was recycled in FY20. The TSF at Nova is fully lined and has no associated groundwater mound. At the Tropicana Operation, 5,238.3ML of water was withdrawn from groundwater bores in FY20. Groundwater monitoring is completed to measure any effect that abstraction is having on the surrounding water table, including water levels and chemistry. The Tropicana Operation TSF has a lined portion below the decant area, while the rest of the facility is unlined and has an associated groundwater mound. Consequently, the site completes vegetation impact assessments to determine if either abstraction or mounding is causing tree stress or deaths. To date, vegetation monitoring indicated that neither has had an impact on the overlying bushland. Surface water monitoring is also undertaken after significant rainfall events, to determine the effectiveness of the site’s water management infrastructure. Results indicate that surface water management on site was effective. WATER INPUT WATER OUTPUT INTERNAL STREAM Evaporation & other losses 1 909.51 ML DECANT WATER RECYCLE 877.90 ML Paste Holdup 198.70 ML Water In Concentrate 25.91 ML Mine Seepage 218.81 ML Bores 1,043.12 ML Ore Moisture 14.52 ML Precipitation 55.99 ML Deposited Tailings Holdup 16.25 ML TOTAL SITE Balance -2.61 ML Decant Recycle 877.90 ML Change In Storage 59.02 ML Output 1,276.03 ML Input 1,332.43 ML 1. Includes evaporation from TSF and decant ponds, waste water discharged to licenced sprayfield and water used for dust supression. NOVA OPERATION WATER BALANCE Nova Operation processing flotation tanks 60 — IGO SUSTAINABILITY REPORT 2020 IGO SUSTAINABILITY REPORT 2020— 61 RESPONSIBLE OPERATIONS