IFRS S2 for Mining in Mexico: 2026 Guide
IFRS S2 is the climate-specific standard adopted by CNBV as mandatory for all BMV and BIVA issuers starting January 2025, making Mexico the first country in North America to implement IASB's ISSB standards. Companies must report GHG emissions across all three scopes, conduct climate scenario analysis, and disclose how climate change impacts their strategy and financial model. Limited assurance of the report by an external auditor will be required starting with the 2027 reporting cycle.
Mining has the highest Scope 1 complexity in Mexico due to process emissions (explosives, heavy machinery diesel, beneficiation plants). IFRS S1 requires physical risk disclosure for tailings under extreme rainfall and transition risk from potential carbon tax that would affect operating costs at ~15-20 USD/t CO₂. Fresnillo and Grupo México have simultaneous exposure to UK and Canadian regulators.
Why IFRS S2 Applies Differently in Mining
VP of Sustainability and CFO of mining groups listed on BMV/LSE with simultaneous CNBV (IFRS S1/S2) and international regulator obligations
Fugitive emission calculation from open-pit blasting: ANFO explosive emission factor is not standardized in mining GHG Protocol and CNBV auditors will question it
Groundwater consumption per mine in Chihuahua and Sonora aquifers: CONAGUA concessions vs. actual consumption diverge and IFRS S1 requires quantified water risk disclosure using AQUEDUCT methodology
Scope 3 category 10 (processing of sold products): smelting and refining of metal concentrates by third parties generates emissions the miner must report even without operational control
Historical environmental liabilities (tailings, slag) valued under NIF but not under IFRS S1 which requires physical risk analysis of collapse from extreme rainfall (Sonora cyclones)
Critical IFRS S2 KPIs for Mining
| Required KPI | Data Source | Difficulty |
|---|---|---|
| Carbon intensity: tCO₂e per tonne of fine metal produced (copper, silver, gold) | Direct combustion (Scope 1) | High 🔴 |
| Water consumption: m³ per tonne of processed ore broken down by source (surface, groundwater, recycled) | Electricity bills (Scope 2) | High 🔴 |
| Water recovery rate in closed-loop beneficiation circuit | Cat 1 - Explosivos y reactivos de proceso comprados | High 🔴 |
| Tonnes of tailings generated per year and certified structural stability (NOM-141-SEMARNAT) | HR / payroll system | Medium 🟡 |
| Energy intensity: GJ per tonne of extracted ore (differentiating open-pit vs. underground) | ERP / accounting system | Medium 🟡 |
Hard-to-Collect Data in Mining
Fugitive methane emissions from blasting and tailings dust: require direct field measurement with portable analyzers, no valid generic factors exist by mineral type in Mexico
Groundwater consumption per individual mine when wells are shared between operations in the same aquifer
Hazardous waste by mineral type and process (cyanide leaching, flotation with reagents) broken down by destination: landfill, co-processing, recycling
That is why manual Excel-based processes will not pass the 2027 assurance. Without automated traceability, an external auditor cannot verify the completeness or accuracy of emissions data.
Checklist: 8 Steps to Comply with IFRS S2 in Mining
- 1
Reporting of GHG emissions Scope 1, 2, and 3 (full value chain) in metric tons of CO₂ equivalent
- 2
Climate scenario analysis aligned to TCFD using at least 1.5°C and 2°C as reference pathways
- 3
Identification and quantification of physical risks (chronic and acute) and transition risks
- 4
Disclosure of emissions reduction targets, including net-zero goals with interim milestones
- 5
Description of how climate risks and opportunities affect business model, strategy, and cash flows
- 6
Connect data sources (ERP, meters, suppliers) to a centralized platform
- 7
Review with internal audit team and adjust consolidation perimeter
- 8
Generate report in CNBV/CINIF format ready for external assurance
How Climatta Automates IFRS S2 for Mining
Automated Collection
Eliminate spreadsheets in Mining. Climatta connects your systems and automatically collects Carbon intensity: tCO₂e per tonne of fine metal produced and other critical KPIs.
Auditor-Grade Traceability
Every data point has source, date, and owner documented. The 2027 assurance auditor can trace every figure to its origin in your systems.
IFRS S2 Report Ready
Generates the report in the exact CNBV format — tables, metrics, and narrative. No last-minute manual reformatting.
Onboarding in 4 Weeks
Climatta connects to Mining systems in 4 weeks. No months-long IT project or external implementation consultant.
FAQ: IFRS S2 in Mining
Ready to comply with IFRS S2 in Mining?
Climatta centralizes all data collection, generates the report in regulatory format, and leaves it ready for 2027 external assurance. No spreadsheets.