Sustainability Report 2021

Ongoing impact monitoring As a matter of normal practice and in line with our EIA guidelines, we complete ongoing impact monitoring at all our operations. At a minimum, our monitoring will continue until we have a firm understanding of: • the total area of land disturbed or otherwise impacted by our activities • changes to ecosystem function, and the composition of flora and fauna present within our operational areas • changes to the socio-economic circumstances of our host communities; and • the adequacy of our impact controls or mitigation activities. PROTECTING BIODIVERSITY IGO are privileged to work in some of Australia’s most unique and remote regions, with important biological, ecological and cultural heritage values. Actively managing our impact on biodiversity is essential for reducing risk, ensuring future land access, and maintaining our social licence to operate. We are committed to contributing to the conservation of biodiversity and seek to understand and protect the flora and fauna at all our operations. Nova Operation Our Nova Operation is situated within the Great Western Woodlands (GWW), the largest relatively untouched temperate woodland left on Earth. The GWW covers almost 16M ha and co-exists with more than 300 mines, 5,000 tenements and pastoral leases that cover about 20% of the area. Field studies conducted within the Nova Operation during its feasibility phase found a total of 45 vegetation communities, comprising 28 eucalypt woodland communities, 13 mixed shrublands and shrub communities, and four hammock grassland communities. A total of 142 vertebrate fauna species, including 40 reptile, 82 bird and 20 mammal species were recorded. The Nova Operation area represents 0.03% of the GWW’s total area. Invasive species have a major impact on Australia’s environment, threatening biodiversity and reducing overall species abundance and diversity. They represent one of the more potent, persistent, and widespread threats to the environment. Within the context of the locations in which IGO operates in Australia, the key invasive pest species include the feral cat (Felis catus) and European Rabbit (Oryctolagus cuniculus), and plant species Onion Weed (Asphodelus fistulosus), Ward’s Weed (Carrichtera annua), Maltese Cockspur (Centaurea melitensis), Marsh Mallow (Malva parviflora) and Doublegee (Rumex hypogaeus). We continued to support the trial of the Felixer, a cat trapping innovation, that employs sensors and advanced algorithms to automatically identify feral cats and foxes by their unique shape and administer a poison onto their fur. In addition, we plan to complete a study to better understand the population dynamics of the feral cat population at our Nova Operation. Although none of the weed species found at the Nova Operation are listed as Declared Pests or are Weeds of National Significance, we complete regular weed management activities. Activities include weed monitoring, control spraying, and weed hygiene inspections on all earth- moving machinery brought onto site or exploration projects. Fraser Range Exploration activities in the Fraser Range are situated within the GWW and the western edge of the Great Victoria Desert. During FY21, the IGO exploration Fraser Range team completed a desktop environmental study across the northern portion of the tenure holding. This study was completed to better understand the environment in which we conduct exploration work programs and identify any critical environmental receptors. This work complements the large-scale EIA completed during FY20, which is used as an ongoing management tool for assessing, managing and mitigating our environmental impacts. Northern parts of our Fraser Range exploration project area fall within the Plumridge Lakes Class A Nature Reserve, although these tenements are not granted, and we do not operate on these tenements. Several tenements in the southern part of the project are located within the Dundas Nature Reserve and proposed Lake Harris Nature Reserve. IGO operates under approved Conservation Management Plans and our internal EIA guidelines when working in these nature reserves. Lake Mackay Our Lake Mackay Project is located 400km west-north-west of Alice Springs and sits within the Great Sandy Desert Bioregion of Western Australia and the Northern Territory, which has a temperate-subtropical climate and consists primarily of red dune fields and sandplains supporting Triodia hummock grasslands, Acacia shrublands, and open eucalypt or Allocasuarina woodlands. Our practices at Lake Mackay are targeted at minimising impacts across our entire tenure. We have completed a desktop biological assessment to better understand the environmental values of the study area and the likelihood of occurrence of significant species and communities. The assessment, which characterised the flora, vegetation and fauna values that may be impacted by future exploration or development activities, has informed our environmental management approach for the project. Kimberley IGO acquired significant exploration tenure in the west and east Kimberley region in FY20. The Kimberley region is highly regarded around the world and regularly attracts national and international interest from diverse stakeholders, primarily because of its status as a highly valued cultural heritage and environmental area, and tourist destination. We are acutely aware of the significant land access challenges and biological significance of the region, which needs to be well understood before embarking on any activity which could affect IGO’s social licence to operate. Consequently, the IGO exploration Kimberley team completed a reconnaissance flora and vegetation survey in FY21, alongside fauna surveys across areas of interest. The surveys were designed to investigate the flora and fauna in the vicinity of planned exploration works and ensure all measures can be taken to mitigate negative environmental impacts. An EIA was also completed, with input from both the Department of Mines, Industry Regulation and Safety (DMIRS) and the Department of Biodiversity, Conservation and Attractions (DBCA). The EIA had key outcomes which helped to minimise the impact of the exploration work upon the known populations of Northern Quoll (Dasyurus hallucatus). Environment 76 —IGO SUSTAINABILITY REPORT 2021