of the project only in relation to the amendment being sought. As such this report considers emissions associated with the proposed amendment to the EA to authorise the Upper Mundic Gully TSF and does not consider other potential emissions associated with mining activities authorised under the current EA (effective date 26 May 2025). The overall methodology used to perform the GHG assessment for the Project was: 1. Define the emission boundary for the Project; 2. Identify major life cycle activities of the Project and associated emission sources; 3. Classify emission sources as Scope 1, Scope 2, or Scope 3; 4. Identify appropriate methodologies and required data and emission factors for each emission source; and 5. Calculate estimated GHG emissions. This assessment has considered Scope 1, Scope 2 and Scope 3 emissions associated with the Project and the boundary of the assessment is defined as: ∕ Construction of the Project, including vegetation clearing, earthworks, material haulage, embankment construction, liner installation, associated heavy machinery and power usage; ∕ Operational activities of the Project, including water plant discharge pump systems, return to water plant pump systems, and Open Cut Pit to Upper Mundic Gully pump systems; ∕ Closure and rehabilitation of the Project, including reprofiling beach, spillway construction, importation of cover material, seeding and mulch application; and ∕ For Scope 1 and 2 emissions, the geographical boundary includes the footprint of the Project, construction material sources that are on-site, and directly related haul roads. All other related activities that are outside this area have been considered to fall under Scope 3 emissions. The maximum annual emissions (Scope 1 and Scope 2) for the Project were calculated as 9,947 tonnes of CO 2 -e. In accordance with DETSI guidelines this application falls under the category of low emitter being less than 25,000 tonnes CO 2 -e per year. As specified in Table 3 of the Greenhouse Gas Emissions Guidelines (DETSI, Greenhouse Gas Emission, 2025) , Scope 3 emissions are not required to be assessed for low emitters. The Scope 1 and 2 emission sources for each phase of the Project are shown in Table 64. Table 64. GHG Emission Inventory
Phase
Scope 1
Scope 2
Vegetation Clearing
Electricity for pump used for dewatering
• •
•
Construction (2028)
Fuel combustion from earthmoving equipment (dozers, graders, haul trucks, excavators)
Fuel for light vehicles
•
Fuel combustion in light vehicles for inspections and maintenance Fuel use in emergency generators
Electricity for water plant discharge pump systems, return to water plant pump systems, and OCP to UMG pump systems
•
•
Operation (2029-2033)
•
Project number: 25B061
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