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Mineral Resource Estimates (Inclusive of Reserves) - December 31^st, 2023

Note: Totals may not summate correctly due to rounding

Mineral Reserves Estimates - December 31^st, 2023

Note: totals may not summate correctly due to rounding

Notes on Mineral Resource and Mineral Reserve Tables

Mineral Resource and Mineral Reserve estimates are shown on a 100% basis. The Measured and Indicated Mineral Resource estimates are inclusive of those Mineral Resource estimates modified to produce the Mineral Reserve estimates. All estimates, with the exception of Josemaria are effective as at December 31, 2023. The Josemaria Mineral Resource estimates are effective as at July 10, 2020 and the Mineral Reserve estimates are effective as at September 28, 2020.

Reference herein to $ or USD is to United States dollars, CLP is to Chilean pesos, BRL is to Brazilian real, EUR refers to euros, and SEK is to Swedish kronor. Unless noted otherwise, Mineral Reserves for all active mines have been estimated using metal prices of $3.65/lb copper, $1.15/lb zinc, $0.90/lb lead, $10.0/lb nickel and $1,600/oz gold, whereas Mineral Resources have been estimated using metal prices of $4.20/lb copper and $1,840/oz gold. Exchange rates used were EUR/USD 1.10, USD/SEK 9.00, USD/CLP 800 and USD/BRL 5.00 for Mineral Reserve and Mineral Resource estimates. For the Josemaria Mineral Reserve, the metal prices used were $3.00/lb copper, $1,500/oz gold and $18.00/oz silver.

For a better understanding of each of the Company's deposits readers are encouraged to read the technical reports and other public disclosure of the Company, including all qualifications, assumptions, exclusions and risks that relate to the Mineral Resource and Mineral Reserve estimates. The technical reports are listed below, are intended to be read as a whole, and sections should not be read or relied upon out of context.

Unless noted otherwise, the Mineral Resource and Mineral Reserve estimates were prepared under the supervision of and verified by Cole Mooney, P.Geo., Director, Resource Geology, and Arkadius Tarigan, P.Eng., former Director, Reserves and Mine Planning, respectively for all sites below. They have also reviewed, verified and approved the technical and scientific information in this news release. No limitations were imposed on their verification process. Both Messrs. Mooney and Tarigan are Qualified Persons as defined under NI 43-101.

Candelaria and Ojos del Salado

Candelaria and La Española open pit Mineral Resource estimates are reported within a conceptual pit shell with cut-off grades of 0.13% and 0.15% copper, respectively. Underground Mineral Resources are estimated at cut-off grades of 0.38% and 0.47% copper for Candelaria underground and Ojos del Salado, respectively. Mineral Reserves for the Candelaria open pit, Española open pit, and Candelaria underground are estimated at cut-off grades of 0.14%, 0.16% and 0.44% copper, respectively. Mineral Reserves for the Santos mine at Ojos del Salado is estimated at a cut-off grade of 0.51% copper.

For further information on Candelaria, refer to the Technical Report entitled Technical Report for the Candelaria Copper Mining Complex, Atacama Region, Region III, Chile, dated February 22, 2023, which is filed under the Company's profile on SEDAR+ at www.sedarplus.ca.

Caserones

Caserones Mineral Resource estimates are reported within conceptual pit shell using a cut-off grade of 0.13% copper. Mineral Reserves for the Caserones open pit are estimated using open pit discard NSR cut-off values of $11.70/t for ore processed at concentrating and $3.65/t for ore delivered to the heap leach and SX/EW processing.

For further information on Caserones, refer to the Technical Report entitled NI 43-101 Technical Report on the Caserones Mining Operation, Atacama Region, Chile, dated July 13, 2023 which is filed under the Company's profile on SEDAR+ at www.sedarplus.ca. 

Chapada

The Chapada and Suruca copper-gold Mineral Resource estimates are reported within a conceptual pit shell at an open pit discard NSR cut-off value of $5.80/t. For the Suruca copper-gold, NSR cut-off value of $6.80/t was used for oxide (heap leach) and sulphide portion, and $11.42/t for oxide (carbon-in-leach). For the Suruca gold only Mineral Resource estimates, NSR cut-off values of $6.80/t for oxides and $11.42/t for mixed and sulphide were used. Mineral Reserves are estimated using open pit discard NSR cut-off values of $5.80/t and $6.80/t for the Chapada open pit and Suruca gold oxides respectively.

For further information on Chapada, refer to the Technical Report entitled Technical Report on the Chapada Mine, Goiás State, Brazil, dated October 10, 2019 which is available on Lundin Mining's SEDAR+ profile atwww.sedarplus.ca.

Eagle

The Eagle Mineral Resource and Mineral Reserve estimates are reported using NSR cut-off values of $143.9/t, $150.4/t, $176.4/t and $151.2/t for Eagle, Upper Keel and Eagle East cut and fill and stope zones, respectively. The NSR is calculated on a recovered payable basis considering nickel, copper, cobalt, gold and PGM grades, metallurgical recoveries, prices and realization costs.

Josemaria

The Josemaria open pit Mineral Resource estimates are reported within a conceptual pit shell based on metal prices of $3.00/lb copper, $1,500/oz gold and $18.00/oz silver with a cut-off grade of 0.10% copper. Mineral Reserve estimates for Josemaria are estimated at NSR cut-off values ranging from $5.16/t to $5.22/t, based on metallurgical unit. Mr. Dustin Smiley, P.Eng., Manager, Mine Engineering and Costing, Lundin Mining reviewed and verified the Mineral Reserves estimates for Josemaria project.

For further information on Josemaria, refer to the Technical Report entitled NI 43-101 Technical Report, Feasibility Study for the Josemaria Copper-Gold Project, San Juan Province, Argentina dated November 5, 2020, which is available on the Company's subsidiary, Josemaria Resources Inc.'s SEDAR+ profile at www.sedarplus.ca

Neves-Corvo and Semblana

The copper Mineral Resource estimates are reported within geological volumes based on a nominal cut-off grade of 1.0% copper and the zinc Mineral Resource estimates are reported within geological volumes based on a nominal zinc cut-off grade of 4.5% zinc. The copper and zinc Mineral Reserve estimates have been calculated using variable NSR values ranging from €49/t to €82/t based on mineralization, areas and mining methods.  The NSR is calculated on a recovered payable basis considering copper, lead, zinc and silver grades, metallurgical recoveries, prices and realization costs.

The Mineral Resources at Semblana are estimated above a cut-off grade of 1.0% copper.

For further information on Neves-Corvo and Semblana, refer to the Technical Report entitled NI 43-101 Technical Repot on the Neves-Corvo Mine, Portugal, dated February 22, 2023 which is filed under the Company's profile on SEDAR+ at www.sedarplus.ca.

Saúva

The Saúva open pit Mineral Resource estimates are reported within a conceptual pit shell with NSR cut-off value of $7.80/t.

Zinkgruvan

The zinc and lead Mineral Resources are estimated within optimized stope volumes, using a 3.5 m minimum mining width, based on an area dependent marginal NSR cut-off between SEK 740/t and SEK 920/t.  The copper Mineral Resource estimates are reported within optimized stope volumes above a cut-off NSR values ranging from SEK 800/t to SEK 830/t. The zinc and copper Mineral Reserves are estimated at NSR cut-off values ranging from SEK 950/t to SEK 1,100/t depending on the mineralization, areas and mining methods.  The NSR is calculated on a recovered payable basis considering copper, lead, zinc and silver grades, metallurgical recoveries, prices and realization costs.