Scope 3 emissions — those occurring across an entity’s value chain — are typically the largest component of a mining company’s carbon footprint. For iron ore producers, the downstream processing (steelmaking) can represent 95%+ of total emissions. ASRS 2 requires Scope 3 disclosure, with transitional relief and modified liability safe harbour provisions.
Here is a practical framework for Australian miners approaching Scope 3 for the first time.
Which Scope 3 Categories Matter for Mining?
Not all 15 GHG Protocol Scope 3 categories will be material. For most Australian miners, focus on:
- Category 10: Processing of sold products — the dominant category for iron ore, bauxite, and metallurgical coal producers
- Category 11: Use of sold products — critical for thermal coal and LNG producers
- Category 1: Purchased goods and services — explosives, reagents, fuel, contractor services
- Category 4: Upstream transportation — haulage, port logistics, shipping
- Category 3: Fuel and energy-related activities — not included in Scope 1 or 2
Data Challenges
Australian miners face specific Scope 3 data challenges:
- Customer anonymity: Commodity sales often go through traders, making downstream tracking difficult
- Jurisdictional variation: Downstream emission factors vary by destination (Chinese steel vs. Japanese steel vs. Indian steel)
- JV complexity: Joint venture and offtake arrangements create boundary questions
- Contractor fleet: Mining contractors operate significant mobile equipment fleets under Scope 3
Safe Harbour Implications
The modified liability provision protects Scope 3 disclosures made in good faith. This means:
- Use best available data and clearly document methodology
- Disclose data quality limitations transparently
- Avoid precision claims that cannot be substantiated
- Update estimates as better data becomes available
Safeguard Mechanism Intersection
Many ASX-listed miners are also Safeguard Mechanism facilities (100,000+ tCO2-e per year). ASRS and Safeguard reporting are separate obligations but share data requirements. An integrated approach avoids duplication.
RSustain Advisory
RSustain provides Scope 3 estimation, methodology design, and ASRS disclosure preparation for mining entities. Our cross-jurisdictional ISSB experience helps with multi-country reporting obligations. Book a free scoping call.
RSustain UK provides advisory services only. We do not provide statutory assurance or verification.