Audits, Assessments & Due Diligence


Desk review verification
We can work with you to conduct a desk review of your or your supplier’s environmental, social and governance practices against agreed requirements.

Onsite audits and assessments
We are an approved auditor against key sustainability and responsible sourcing standards for industry programs and trusted partners, including:

RMI RMAP audits

TDi is an approved auditor to conduct RMAP audits worldwide.

Bettercoal assessments

TDi staff are approved lead assessors for Bettercoal assessments.

Equitable Origin Audits

TDi staff are approved assessors to conduct audits against EO100 Standard and the EO100 for Natural Gas.

The Copper Mark is audited by TDi Sustainability

The Copper Mark

TDi is approved to provide audits and independent reviews against The Copper Mark’s assurance system, worldwide.

The Nickel Mark is audited by TDi Sustainability

The Nickel Mark

TDi is approved to provide audits and independent reviews against The Nickel Mark’s assurance system, worldwide.

The Zinc Mark is audited by TDi Sustainability

The Zinc Mark

TDi is approved to provide audits and independent reviews against The Zinc Mark’s assurance system, worldwide.

The Molybdenum Mark is audited by TDi Sustainability

The Molybdenum Mark

TDi is approved to provide audits and independent reviews against The Molybdenum Mark’s assurance system, worldwide.

Audits and assessments against customer specific requirements, Supplier Codes of Conduct and sustainability standards and frameworks such as International Finance Corporation/IFC Performance Standards, IRMA Standard for Responsible Mining, OECD Due Diligence Guidance for Responsible Supply Chains of Minerals from Conflict-Affected and High-Risk Areas among others.

Local staff

We have a wide network of our auditors based around the globe to ensure that you get the support you need from a skilled team familiar with local context and specifics.

Continuous Improvement and Capacity building


Stay ahead of the curve and on top of ever-changing responsible-sourcing requirements by taking advantage of our services which include:

  • Continuous improvement support: Following the assessments, we’ll work with you to help prioritise and implement improvement actions needed to close the gaps identified during the assessments.
  • Building capacity of your staff: We’ll work with you between audits to ensure your knowledge stays current, complete and relevant.

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Julija Menise

VP Europe at TDI Sustainability