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A mining project due diligence checklist should verify that a contractor or supplier can perform its specific work safely, lawfully and responsibly—not simply collect a standard pack of documents. For project owners, procurement teams and construction firms, the right review is risk-based: tailor evidence and scrutiny to the contract scope, site conditions, local requirements, subcontractors and potential environmental and social impacts.
Use the checklist below from early qualification through contract award and ongoing monitoring. It is a cross-jurisdiction starting point, not a universal list of permits or a substitute for applicable law, the mine operator’s current rules or project-specific requirements.
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What should a mining contractor and supplier due diligence checklist cover?
It should cover the contractor’s identity and capability, relevant experience, safety and environmental controls, labor and human-rights safeguards, governance and corruption controls, supply-chain visibility, and ability to cooperate with monitoring and corrective action. The scope should match the actual work: a supplier with limited site exposure may need different evidence from a contractor whose workforce operates at the mine or interacts with affected communities.
The International Finance Corporation (IFC) recommends proportionate contractor prequalification and adapting its generic questionnaire to the project context. As its contractor-management guidance puts it: “The number of documents and level of information and detail that are requested to contractors shall be commensurate to the scope of work and other specific features that the contractor is being prequalified against.” In practice, ask for evidence that helps you decide whether the bidder can meet the obligations of this contract—not paperwork for its own sake.
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Use the framework in three stages: define the risk and requirements, evaluate the bidder against evidence, and manage any gaps during delivery. A checklist is a decision aid, not an automatic pass/fail score: a serious weakness in a critical control should not be hidden by strong scores elsewhere.
How should you scope the review before requesting documents?
Start by recording what the contractor or supplier will actually do, where and for whom. That context determines the evidence to request and the level of review that is proportionate.
- Project and phase: identify the mine, project phase and commodity, plus the location and operating context.
- Work package: describe the services or goods, site access, expected workforce, schedule, and interfaces with the operator’s work or other contractors.
- People and relationships: identify subcontractors, labor intermediaries and security providers, where relevant, and clarify which party manages them.
- Exposure: note the work’s environmental and social risks, including contact with workers, communities, land, cultural resources or sensitive environments.
- Review stage: state whether this is prequalification, tender evaluation, onboarding or performance monitoring. The evidence needed can change at each stage.
- Applicable requirements: identify the in-country ESHS (environmental, social, health and safety) obligations and the mine’s current policies and site rules that apply to the work.
Do not copy a permit list from another mine and treat it as universally valid. Requirements depend on jurisdiction, activity and scope; make local legal verification an explicit task. Communicate relevant client policies and project requirements in the solicitation, rather than expecting bidders to infer them.
What company, experience and capacity evidence should you request?
Ask for enough information to verify who will do the work, whether the firm has relevant capability, and whether it has the people and systems to deliver at this site. Scale requests to the contract rather than applying the same document burden to every bidder.
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- Company identity and ownership information appropriate to the project’s screening process.
- Relevant mining or comparable-project experience, including references that can speak to similar work and conditions.
- An organizational chart, named project lead and clear accountabilities for safety, environmental and social performance.
- The number, qualifications and responsibilities of ESHS personnel assigned to the work.
- A description of the contractor’s environmental and social management system (ESMS), if applicable, and how it will be implemented for this contract.
- Relevant past EHS performance, including incidents, reported issues and corrective actions, with enough context to understand the response and lessons applied.
- Details of subcontractors and other business relationships involved in delivery, along with the processes used to oversee them.
Check that stated capacity is available for this project, not merely present in the company generally. A well-written policy does not by itself demonstrate competent personnel, operational controls or a history of resolving problems. IFC’s prequalification topics include past EHS performance, ESMS status, personnel competence and occupational health and safety procedures and controls.
How can you assess safety and environmental performance?
Review both the contractor’s management arrangements and the controls it proposes for the specific site and task. Ask for evidence that connects written procedures to worker training, supervision, emergency readiness and actual work practices.
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- Performance and learning: review incident and corrective-action records relevant to the work. Consider what happened, how the issue was addressed and whether corrective actions were tracked.
- Emergency preparedness: ask how the contractor will coordinate with the mine’s emergency arrangements and communicate and respond to incidents.
- Environmental controls: check controls that fit the scope, such as pollution prevention, waste handling, water use and environmental incident reporting. Include interfaces with tailings or other site systems where relevant to the work.
- Site-specific implementation: ask how the bidder will apply its systems under the mine’s conditions and comply with the operator’s requirements.
Where an operator publishes a contractor manual, verify the current revision and request scope-specific requirements from the appropriate site contact. For example, Freeport-McMoRan’s supplier guidance tells contractors to use the latest revision of its Contractor Health, Safety and Environmental Manual and to contact the site project manager for policies specific to their scope. That is an operator-specific example, not a universal mining standard.
What labor, human-rights and community risks should be checked?
Look beyond the bidder’s direct employees. Workers supplied through subcontractors or intermediaries, security arrangements and impacts on communities can all be relevant to a mining contract, depending on its location and risk.
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- Review labor policies and terms, worker complaints, relevant labor incidents and the process for resolving concerns.
- Ask how workers can raise complaints safely, how grievances are handled and whether the process reaches subcontractor workforces.
- Check codes of conduct and controls for harassment and other forms of gender-based violence, including how allegations are addressed.
- Identify any use of labor intermediaries, migrant labor or other potentially vulnerable groups and ask how the contractor manages associated risks.
- Where the scope or location makes them relevant, consider land acquisition and use, Indigenous Peoples’ and cultural rights, consultation, and the conduct of security providers.
- Identify affected communities and ask how the contractor will report concerns or coordinate with the project’s engagement and grievance processes.
IFC includes HR policies, codes of conduct, grievance-mechanism controls and prior reported incidents among its contractor prequalification topics. The UNEP Finance Initiative’s minerals and metals extraction toolkit highlights considerations such as labor incidents and complaints across contractor workforces, vulnerable groups, land and cultural rights, and security personnel. Use these topics to determine what applies; do not assume every risk is present in every contract.
How should you check corruption controls and supply-chain transparency?
Assess whether the supplier can identify and manage corruption risks in its own business relationships, and whether the project can see relevant actors and respond to concerns. These checks matter in procurement as well as in mineral supply chains, though the appropriate depth depends on the company’s role and risk.
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- Ask how it assesses suppliers and other business relationships, identifies allegations or violations, and escalates concerns.
- Review how subcontractors and intermediaries are selected and overseen, and whether payment practices and responsibilities are sufficiently transparent for the project’s screening.
- For relevant mineral supply-chain risks, identify upstream actors and review traceability or chain-of-custody controls where applicable.
- Ask whether there is a grievance mechanism and a documented process for assessing risks and responding to them.
The OECD’s minerals supply-chain anti-corruption FAQ advises assessing a supplier’s due diligence systems before contracting and continuing checks where risk warrants. It also recommends contract clauses with clear consequences for corruption risks. The OECD’s responsible minerals guidance describes a framework that includes management systems, supplier engagement, grievance mechanisms, risk assessment and a response plan. Its approach distinguishes among continuing trade with mitigation, temporary suspension and disengagement according to circumstances and results.
How should bids be evaluated and requirements written into contracts?
Give bidders the project’s applicable requirements early, then compare them on evidence tied to the work. Put relevant commitments into the agreement so expectations do not end when prequalification closes.
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- Set the evaluation criteria. Use scope-relevant experience, site fit, safety and E&S capability, personnel, labor and human-rights safeguards, corruption controls, supply-chain visibility, community engagement and capacity to correct weaknesses.
- Choose weights to reflect risk. Set weights in light of project risks and legal obligations. Do not let a composite score mask a critical gap in a safety, legal or other essential control.
- Give bidders the rules. Include relevant local ESHS compliance evidence, client environmental and social policies, contractor requirements and applicable public governance commitments in the solicitation package.
- Check evidence proportionately. Use questionnaires, document review, site visits, audits or performance metrics where they are appropriate to the risk and the stage of procurement.
- Make commitments enforceable. Incorporate relevant controls and defined performance indicators into the contract. Address anti-corruption obligations and consequences clearly.
- Record decisions. Document the evidence considered, material gaps, any conditions of award and the reasons for the decision.
The IFC’s Environment and Social Management System Toolkit, version 2.0 (August 2025), recommends using checklists or rating systems to evaluate new and current suppliers, identifying risks through tools such as questionnaires, visits, audits and metrics, and preparing action plans when a contractor or primary supplier falls short. Existing supplier assessments or assurance programs may inform the review, but check their scope, currency and relevance; a certification is not proof that every project-specific risk has been addressed. The OECD’s environmental due diligence handbook identifies existing assessments and initiatives as possible inputs to due diligence.
How should you monitor performance and respond to gaps?
Set monitoring responsibilities and escalation steps before work begins. A gap is only manageable if someone owns it, the contractor knows what evidence is expected, and the project has a way to check whether corrective action worked.
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- Name the project and contractor owners responsible for monitoring and escalation.
- Define evidence requirements, review frequency, incident-reporting expectations and site access arrangements.
- Include audit rights where appropriate, along with relevant performance indicators and reporting lines.
- For each finding, record the risk, required action, accountable owner, deadline and how completion or effectiveness will be verified.
- Escalate significant incidents or overdue actions according to the agreed process and applicable requirements.
Possible responses include continuing work while pursuing measurable mitigation, temporarily suspending the relationship while mitigation proceeds, or disengaging when mitigation fails or is not feasible or acceptable. Document and proportion the response to the nature and severity of the risk. The OECD framework calls for risk-management plans and senior-management reporting; IFC guidance supports monitoring and action plans.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should you avoid when using a mining due diligence checklist?
A checklist can create false confidence if it rewards paperwork rather than performance or treats all contracts as alike. Use it to structure questions and decisions, then investigate important gaps.
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- Do not use one fixed document pack for every work package. Request evidence in proportion to the scope, site conditions and risks.
- Do not treat a policy as proof of implementation. Ask how the policy is applied, by whom, and what relevant records show.
- Do not assume local rules from another jurisdiction apply. Verify legal and permit requirements for the actual location and activity.
- Do not stop at the prime contractor. Consider relevant subcontractors, intermediaries and security providers.
- Do not let an overall score conceal a critical weakness. Identify non-negotiable legal and project requirements and document how material gaps affect the award decision.
- Do not treat an assessment or certification as complete coverage. Confirm that it is current and addresses the work and risks under review.
- Do not award conditions without follow-up. Assign owners and deadlines, monitor the actions and specify the consequences of failure.
The sources provide a framework, not a set of universal permit names, fixed scoring weights, numerical thresholds or monitoring intervals. Set those details using the project’s jurisdiction, contract risk, operator rules and legal advice where needed.
Which sources should inform the checklist?
Use the sources according to their purpose and applicability. IFC materials describe general environmental and social management practices, not substitutes for law or site rules. OECD minerals guidance is government-backed guidance for companies across mineral supply chains, from mines to end users; the detail should reflect the mineral and the company’s position in the chain. UNEP FI’s toolkit helps identify mining-sector human-rights considerations. The operator’s current requirements govern its own sites.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe relevant versions in this framework include the IFC ESMS Toolkit version 2.0, August 2025; the OECD minerals guidance’s third edition, dated April 6, 2016; the OECD anti-corruption FAQ, dated June 1, 2021; and the OECD environmental due diligence handbook, published September 19, 2023. Use these as guidance inputs while confirming current local obligations and site requirements for the work being procured.
Frequently Asked Questions
Can a small supplier use the same checklist as a major mining contractor?
It can use the same risk categories, but the evidence requested should be proportionate to its role, workforce, site exposure and potential impacts. A small supplier with no mine-site work may not need the same review depth as a contractor performing operational work at the site.
Does a supplier certification replace project due diligence?
No. An existing certification or assurance assessment can be an input, but check its scope, currency and relevance to the contract. It may not cover site-specific risks, subcontractors or the operator’s current requirements.
Who should own contractor due diligence inside a mining project?
The available data does not prescribe a universal department or job title. The project should name accountable procurement and operational owners, involve appropriate ESHS and legal expertise, and define who tracks findings and escalates unresolved risks.
When should a mining buyer suspend rather than end a supplier relationship?
That depends on the severity and circumstances of the risk and whether mitigation is feasible and producing results. OECD guidance recognizes continued engagement with mitigation, temporary suspension and disengagement as distinct responses; document why the selected response is proportionate.
