INDEPENDENCE GROUP NL SUSTAINABILITY REPORT 2017

OTHER SIGNIFICANT EMISSIONS MINE CLOSURE PLANNING Mine closure planning is a complex process, with the planning horizon typically measured in decades. Planning for mine closure must consider social, economic, physical and biological parameters that generally change over the life of a mine. Difficulties associated with mine closure are often the product of poor initial planning. Consequently, mine closure planning is a matter for consideration during all stages of operation and particularly during a project’s feasibility phase. The potential impacts of closure are an ongoing consideration in IGO’s engagement with governments and local communities. Potential impacts of closure are also considered in regard to our support of community development initiatives and local business. Mindful of this, and in conformance with Western Australian law, IGO has approved Mine Closure Plans (MCPs) for its Jaguar, Long and Nova operations, with AngloGold Ashanti producing an MCP for the Tropicana Gold Mine. In accordance with IGO’s regulatory obligations, a review of all our MCPs was completed in FY17, with updated versions for our operations submitted to the DMIRS. The MCP review process included a group-wide closure planning study that involved a multidisciplinary team of consultants. The study comprised a review of closure panning strategies at all sites, updated closure risk assessments and identification of potential gaps, enabling optimised closure planning activities to be developed. IGO intends to grow its business, and given the likelihood that it may expand into new jurisdictions, IGO developed two closure standards in FY17. These include the IGO Group Environment Standard – Rehabilitation and Mine Closure, and the IGO Group Finance Standard – Provisions for Mine Closure, with both documents integrating relevant Australian and International closure planning guidelines, such as the ICMM Planning for Integrated Mine Closure: Toolkit (refer to www. icmm.com/document/310 ) where appropriate. Consequently, the revision of MCPs is now a structured approach, incorporating both external regulatory requirements as well as meeting internal standards to ensure adequate stakeholder engagement throughout the mine closure planning process. This is depicted in Figure 17 below. Finally, the revised MCPs enabled provisions for the estimated cost of rehabilitation, decommissioning and restoration relating to areas disturbed during the mine’s operation to be updated in FY17. IGO completes annual National Pollutant Inventory (NPI) reporting in accord with Australian law. The NPI is used to track pollution across Australia, and to ensure that the community has access to information about the emission and transfer of toxic substances which may affect them locally. The NPI contains data on 93 substances that have been identified as important due to their possible effect on human health and the environment. In FY17, IGO key NPI reportable pollutants were: MINE PLAN – DEFINE DOMAINS DEMOLITION AND EARTHWORK SCOPE FINAL LANDFORMS ENGINEERED DESIGNS COMPLETION CRITERIA (BASIS OF DESIGN) DEVELOPMENT REGULAR ENGAGEMENT Carbon monoxide kg Jaguar – Air total 50,912 Long – Air total 9,892 Nova – Air total 184,811 IGO total 245,616 Oxides of nitrogen Jaguar – Air total 130,856 Long – Air total 18,776 Nova – Air total 398,171 IGO total 547,803 Sulphur dioxide Jaguar – Air total 154 Long – Air total 17.6 Nova – Air total 230 IGO total 401 Volatile organic compound Jaguar – Air total 5,051 Long – Air total 1,404 Nova – Air total 20,563 IGO total 27,018 NOTE This does not include emissions data for the Tropicana Operation. FIGURE 17 86 — IGO SUSTAINABILITY REPORT 2017

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