Workcard generated from the catalogue
What this topic covers
Prevention, detection, control and remediation of chronic or unintended contamination from sulphide ores, waste rock, tailings, leach residues, process chemicals, fuels and contaminated sediments.
How it shows up in this industry
Sulphide-bearing waste rock, tailings, exposed pit walls, low-grade stockpiles and heap leach residues can generate acid and metalliferous drainage. Integrated processing and site services also use fuels, acids, caustic soda, cyanide where applicable, flotation reagents, metal salts and solvent extraction chemicals that can contaminate land and water if containment fails.
Why it may be material
Acid drainage and contaminated seepage can persist for decades and create long-term treatment OPEX, remediation liabilities and restrictions on closure relinquishment. Unauthorised releases can affect downstream water users, ecosystems and Indigenous or rural communities, triggering enforcement, litigation and financing constraints.
Impact pathway
- Potential effects may reach affected communities.
- Potential effects may reach water bodies.
- Potential effects may reach ecosystems.
- Potential effects may reach soil and groundwater.
- Potential effects may reach future generations.
- Potential effects may reach Indigenous peoples.
- Affected stakeholder groups identified in the source include Affected communities.
- The source places the pathway in Own operations, Downstream.
Financial pathway
- The topic may change operating costs through resource use, controls, remediation or ongoing management.
- The topic may require capital expenditure to adapt assets, processes or infrastructure.
- The topic may create provisions, penalties, remediation costs, claims or other liabilities.
- The topic may affect insurance availability, coverage terms, premiums or claims.
- The topic may affect asset useful lives, impairment assumptions, valuations or stranded-asset exposure.
- The topic may affect access to finance, funding terms or the cost of capital.
Questions to test
- What evidence supports both the impact and financial materiality pathways?
- Which own operations, assets or decisions create or concentrate the pathway?
- Which products, services, customers or end uses create or concentrate the pathway?
- What is the scale, scope, likelihood and remediability of effects on affected communities?
- What is the scale, scope, likelihood and remediability of effects on water bodies?
- What current or proposed regulation could change the topic's relevance?
Evidence to collect
- Community engagement, grievance and impact records
- Water withdrawal, discharge, quality and catchment-impact records
- Biodiversity, habitat and ecosystem-impact evidence
- Soil and groundwater monitoring, incident and remediation records
- Long-term scenario, cumulative-impact and intergenerational analysis
- Indigenous engagement, consent, grievance and impact records
- Operating-cost records and budgets linked to the topic
- Capital plans, asset adaptation budgets and investment approvals
- Provision, claim, penalty, remediation and contingent-liability records
- Insurance coverage, premium, exclusion and claims records
- Asset valuations, useful-life assumptions, impairment tests and stranded-asset analysis
- Funding terms, lender or investor requirements and cost-of-capital analysis
- Process-map item (assets): Geological models, mine plans, ore reserve databases, fleet management systems, plant control systems and environmental monitoring networks
- Process-map item (assets): Explosives magazines, fuel farms, reagent storage tanks, workshops, laboratories and assay facilities
- Process-map item (emerging_pressures): Customer demand for low-carbon aluminium, green steel raw materials and traceable battery metals with mine-level emissions data
- Process-map item (external_impacts): Acid and metalliferous drainage from sulphide-bearing waste rock, tailings and pit walls affecting streams, groundwater and soils
- Process-map item (external_impacts): Tailings dam failure risk causing sudden releases of slurry, contaminants and sediment into downstream valleys and waterways
It may be less material when…
- Organisation-specific evidence does not support significant scale, severity, likelihood or financial effect.
- The organisation has no meaningful exposure to or influence over the relevant downstream pathway.
Affected stakeholders
- Affected communities
Users of the information
- Board / management
- Investors / creditors
- Local authorities
- NGOs / civil society
- Regulators
Standards to check
- ESRS ESRS E2 Pollutionsearch disclosure cards
- ESRS ESRS E3 Water and marine resourcessearch disclosure cards
- GRI GRI 306 Wastesearch disclosure cards
- GRI GRI 303 Water and Effluentssearch disclosure cards
- GRI GRI 14 Mining Sector pollution-related disclosuressearch disclosure cards
- SASB SASB Metals & Mining waste and hazardous materials management topics
Your preliminary screening decision
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