NEWS RELEASE: polymetmining.com/investors/news… • Minnesota Court of Appeals upholds environmental review for NorthMet Project, rejects environmental groups’ petition for supplemental EIS

NEWS RELEASE: polymetmining.com/investors/news… • PolyMet announces commencement of the Rights Offering and trading dates

NEWS RELEASE: polymetmining.com/investors/news… • PolyMet announces preliminary results for rights offering and results of annual shareholder meeting voting

NEWS RELEASE: polymetmining.com/investors/news… • PolyMet closes rights offering

News Release: polymetmining.com/investors/news… • Glencore senior executive Peter Freyberg named to PolyMet board

NEWS RELEASE: polymetmining.com/investors/news… • Department of Natural Resources declines environmental groups’ request to reconsider PolyMet Permit to Mine and dam safety permit

NEWS RELEASE: polymetmining.com/investors/news… • PolyMet reports results for period ended June 30, 2019

NEWS RELEASE: polymetmining.com/investors/news… • Supreme Court denies opponents’ appeal on supplemental EIS decision for PolyMet project

NEWS RELEASE: polymetmining.com/investors/news… • Court dismisses all lawsuits contesting PolyMet land exchange • Federal judge rules that eight environmental groups lacked standing

NEWS RELEASE: polymetmining.com/investors/news… • PolyMet reports results for period ended September 30, 2019

NEWS RELEASE: polymetmining.com/investors/news… • PolyMet drilling program results in additions to NorthMet Mineral Resources and Reserves

NEWS RELEASE: polymetmining.com/investors/news… • Minnesota Supreme Court will hear appeal on three PolyMet permits

NEWS RELEASE: polymetmining.com/investors/news… • U.S. District Court Ends Federal Challenge to PolyMet’s Water Quality Permit

NEWS RELEASE: polymetmining.com/investors/news… • Minnesota Supreme Court rules in favor of PolyMet air permit

NEWS RELEASE: polymetmining.com/investors/news… • PolyMet issues statement addressing EPA’s filing on Section 401 determination

NEWS RELEASE: polymetmining.com/investors/news… • PolyMet Mining reports results for year ended December 31, 2020

NEWS RELEASE: polymetmining.com/investors/news… • State Supreme Court rules in favor of PolyMet Permit to Mine and dam safety permits • Justices reject lower court decision ordering open-ended contested case hearing

NEWS RELEASE: polymetmining.com/investors/news… • PolyMet Mining reports results for period ended March 31, 2021

NEWS RELEASE: polymetmining.com/investors/news… • EPA decision sets up potential review of PolyMet wetlands permit • Company looks forward to presenting scientific evidence showing no downstream water quality effects

NEWS RELEASE: polymetmining.com/investors/news… • PolyMet strikes 50:50 joint venture agreement with Teck Resources • Joint Venture to develop NorthMet, further study Mesaba opportunity