Lundin Mining Corporation announced that, further to its news release dated May 4, 2025, announcing the initial Mineral Resource estimate for the Filo del Sol sulphide deposit, an update to the Mineral Resource estimate for the FilO del Sol oxide deposit and an update to the Mineral Resource estimates for the Josemaria deposit (collectively referred to as the "Vicuna Mineral Resource"), the Company has filed a technical report entitled "NI 43-101 Technical Report on the Vicuna Project, Argentina and Chile", with an effective date of April 15, 2025 (the "Technical Report"). There are no material differences in the Mineral Resource estimates reported in the Technical Report and those contained in the May 4, 2025 news release. The recently released Vicuna Mineral Resource highlights one of the world's largest copper, gold, and silver resources which ranks in the top 10 for Mineral Resources of the largest producing copper mines in the world and is the largest greenfield copper discovery in the last 30 years1.

The proximity of the Filo del Sol and Josemaria projects form the basis of the Vicuna project which allows for joint development capturing greater economies of scale, shared infrastructure and increased optionality for staged expansions to support a globally ranked mining complex. The Technical Report was prepared by Luke Evans, M.Sc., P.Eng. of SLR Consulting (Canada) Ltd, Paul Daigle, P.Geo.

of AGP Mining Consultants Inc., Sean Horan, P.Geo. the Resource Modeling Solutions Ltd., Jeffrey Austin, P.Eng. of International Metallurgical and Environmental Inc., and Bruno Borntraeger, P.Eng.

of Knight Piesold Ltd, each of whom is a "qualified person" as defined by National Instrument 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101") and independent of Lundin Mining. The Technical Report has been prepared pursuant to Canadian Securities Administrator's NI 43-101 requirements and may be found on the Company's SEDAR+ profile and on the Company's website such factors include, but are not limited to: global financial conditions, market volatility and inflation, including pricing and availability of key supplies and services; risks inherent in and/or associated with operating in foreign countries and emerging markets, including with respect to foreign exchange and capital controls; economic, political and social instability and mining regime changes in the Company's operating jurisdictions, including but not limited to those related to permitting and approvals, nationalization or expropriation without fair compensation, environmental and tailings management, labour, trade relations, and transportation; risks relating to indebtedness; the inability to effectively compete in the industry; risks associated with acquisitions and related integration efforts, including the ability to achieve anticipated benefits, unanticipated difficulties or expenditures relating to integration and diversion of management time on integration, including the joint acquisition of Filo Corp. and the joint arrangement with BHP; changing taxation regimes; risks related to mine closure activities, reclamation obligations, environmental liabilities and closed and historical sites; reliance on key personnel and reporting and oversight systems, as well as third parties and consultants in foreign jurisdictions; information technology and cybersecurity risks; risks associated with the estimation of Mineral Resources and Mineral Reserves and the geology, grade and continuity of mineral deposits including but not limited to models relating thereto; uncertainties relating to inferred Mineral Resources being converted into Measured or Indicated Mineral Resources; actual ore mined and/or metal recoveries varying from Mineral Resource and Mineral Reserve estimates, estimates of grade, tonnage, dilution, mine plans and metallurgical and other characteristics; ore processing efficiency; community and stakeholder opposition; financial projections, including estimates of future expenditures and cash costs, and estimates of future production may not be reliable; enforcing legal rights in foreign jurisdictions; environmental and regulatory risks associated with the structural stability of waste rock dumps.