Sustainability reporting is moving from narrative to evidence.
If your organisation is preparing for assurance (or simply wants board confidence), the fastest way to de-risk reporting is to treat it like a capital project deliverable: scope, owners, QA gates, and change control.
Im Monique Chelin, sustainability consultant and Board Director. I work with mining, infrastructure and government teams where reporting is only as strong as the systems behind it. This article outlines what assurance-ready means, why asset-heavy sectors struggle, and a practical stage-gate approach to lift reporting quality.
What assurance-ready actually means
Assurance-ready sustainability reporting means you can demonstrate:
- Clear methodologies and boundaries
- Consistent calculations over time
- Traceability from source data to published figures
- Documented controls and approvals
- Evidence that supports every material claim
In other words, you can answer: Who owns this? Where did it come from? How was it calculated? What changed and why?
Why mining, infrastructure and government find this hard
These sectors have structural complexity that makes assurance harder:
- Multiple sites and assets with different systems
- Contractor-heavy data collection
- Long project timelines and changing baselines
- Metrics that rely on estimates and assumptions
- High stakeholder scrutiny and reputational risk
If you rely on spreadsheets and end-of-year scrambles, you are building a reporting risk that compounds every year.
A practical model: the stage-gate approach to assurance readiness
Think of reporting readiness like a delivery program with four gates.
Gate 1: Define
- Confirm reporting scope and boundaries
- Define material topics and metrics
- Document methodologies and calculation rules
- Assign accountable owners per metric
Deliverable: a reporting scope and methodology pack.
Gate 2: Design
- Map data sources and system owners
- Define controls and review points
- Design an evidence register structure
- Set up version control and change management
Deliverable: a data lineage map and controls plan.
Gate 3: Build
- Implement the evidence register
- Establish monthly or quarterly data checks
- Train metric owners on documentation expectations
- Create exception reporting for outliers and missing data
Deliverable: a working reporting system that produces repeatable outputs.
Gate 4: Verify
- Run internal QA reviews before year-end
- Test traceability for a sample of metrics
- Conduct a dry run assurance review
- Close gaps and document improvements
Deliverable: confidence that the disclosure can withstand scrutiny.
The evidence register: the simplest control that changes everything
If you do one thing, do this: create an evidence register.
An evidence register is not a spreadsheet of numbers. It is a structured record that links each published metric to:
- Source system or document
- Data owner
- Calculation method
- Assumptions and emission factors
- Review and approval history
- Supporting files and references
This is what turns reporting from trust us to here is the proof.
Common assurance pitfalls (and how to avoid them)
- Changing methodologies without documenting it: implement change control.
- No named owners: assign accountability per metric and per narrative claim.
- Inconsistent boundaries: lock scope early and document exceptions.
- Late-stage sign-offs: build review gates into the reporting calendar.
The question to ask
If an assurance provider asked for evidence tomorrow, could you produce it within 48 hours?
If not, the gap is not your writing. It is your system.
Question: Do you have an evidence register, or just a spreadsheet of numbers?
References and further reading
About Monique Chelin
Monique Chelin is a sustainability consultant and Board Director with over 20 years of management experience across mining, infrastructure and government projects. She specialises in sustainability reporting, ESG risk management, project governance and stakeholder alignment for major capital projects.
Let’s Connect
Whether you’re facing a derailed capital project, need expert ESG risk assessment, or want to build sustainability leadership capability in your organization, I deliver practical, results-driven solutions.
I’m based in Brisbane, Australia, and work with clients across Australia and internationally.
📧 Contact me via mjcsustainability.com
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Monique Chelin helps organizations turn sustainability from compliance burden into competitive advantage through integrated ESG risk management, project governance, and capability building.
Founder, MJC Sustainability | Certified PRiSM™ Trainer | Infrastructure Sustainability Council Assessor | 20+ Years International Experience
