External reasonable-level assurance reviews occur at each of our active mining and metals processing operations every three years for purposes of maintaining the Copper Mark and/or Molybdenum Mark and confirming each site is upholding ICMM Performance Expectations. Certain of our larger mining operations also undergo limited-level assurance more frequently to support our disclosures and overall responsible production performance. Assurance reviews also supported the publication of our 2023 Annual Report on Sustainability. Our annual reports on sustainability have been independently verified since 2005.

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