Minnesota Commitment | Global Opportunity

NewRange Copper Nickel - A Significant Global Mineral Resource • M&I resources of 702 million tons (Mt) • • and 2,207 Mt for NorthMet and Mesaba, respectively Further Inferred resources of 441 Mt and 1,423Mt, respectively Resources contain copper, nickel, cobalt, PGMs, gold, and silver Sources: PolyMet Technical Report dated December 30, 2022, as filed under the Company's SEDAR and EDGAR profiles, and the MesabaTechnical Report effective as of November 28, 2022, as filed on SEDAR NorthMet and Mesaba resources are estimated independently with differing underlying variables. Metal price decks are the same, metallurgical recoveries, pit slope variables and NSR cut offs are specific to each resource POLYMET MINING iv

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