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LUN.TO ·

Lundin Mining to Acquire a Majority Interest in the Caserones Copper Mine in Chile

Mergers & Acquisitions

Corporate Office

150 King Street West, Suite 2200

P.O. Box 38, Toronto, ON M5H 1J9

Phone: +1 416 342 5560

Fax: +1 416 348 0303

lundinmining.com

NEWS RELEASE

Lundin Mining to Acquire a Majority Interest in the Caserones Copper Mine in Chile

Toronto, March 27, 2023 (TSX: LUN; Nasdaq Stockholm: LUMI) Lundin Mining Corporation (“Lundin Mining” or

the “Company”) is pleased to announce it has entered into a binding purchase agreement with JX Nippon Mining &

Metals Corporation and certain of its subsidiaries (collectively, “JX”), to acquire fifty -one percent (51%) of the issued

and outstanding equity of SCM Minera Lumina Copper C hile (“Lumina Copper”), a wholly owned subsidiary of JX

which operates the Caserones copper -molybdenum mine (“Caserones”) located in Chile (the “Acquisition”). JX will

receive upfront cash consideration from Lundin Mining of $800 million, and in addition, $150 million in deferred cash

consideration will be payable by Lundin Mining in installments over a six -year period following the closing date .

Lundin Mining will also have the right to acquire up to an additional 19% interest in Caserones for $350 million over

a five-year period commencing on the first anniversary of the date of closing. Additional details are provided below.

Lundin Mining will host a conference call and webcast at 8:00 am ET, 14:00 CET on March 28, 2023, to discuss the

Acquisition. Call details are outlined at the end of this news release.

Acquisition Rationale

• Aligned with strategic goals – delivers a large -scale, long -life copper operation with favorable cash flow

generation, complementing Lundin Mining’s existing operations and overall copper -dominant portfolio of high-

quality base metal mines.

• Enhances copper production profile – increases exposure to a highly desired base metal and on a pro forma

basis would have increased Lundin Mining’s 2022 copper production by 50%1. This will further solidify Lundin

Mining’s position as a meaningful copper producer globally.

• Immediate free cash flow contribution – underpinned by competitive cash costs and modest capital

expenditures, and significantly accretive to operating cash flow per share metrics.

• Continued balance sheet strength – remains a high priority for Lundin Mining, and financial leverage continues

to be low in relation to internal targets and to comparable mining peers. The Company retains healthy liquidity

headroom on its $1.75 billion revolving facility after accounting for the upfront cash consideration for the

Acquisition.

• Upside opportunities – through expected operational improvements under Lundin Mining’s management,

including initiating drill programs. The producing operation comes with a mineral property package in a highly

prospective district and Lundin Mining believes significant exploration potential exists.

• Potential synergies – proximity to Lundin Mining’s Candelaria operations (~160 km from Caserones) introduces

opportunities to realize additional savings and implement effective supply, logistical and management strategies.

• Chile is a well-established Tier-1 mining jurisdiction – Lundin Mining has made a significant investment in the

region and the country, and can leverage its operating experience, as well as local regulatory and community

relationships.

• Attractive call option – clear path for Lundin Mining to increase ownership up to 70% and strengthen its

presence in a leading copper mining district.

• Strengthening partnerships – JX has extensive operational knowledge, which will help Lundin Mining to realize

the full potential of the Caserones mining operation.

1 Based on 2022 actual production as reported by the Company and Caserones and is on a 100% basis.

Commenting on the transaction, Peter Rockandel, CEO, said, “Upon closing of the Acquisition of Caserones , we add

another long-life copper mine of material size and with significant growth potential to our portfolio, in a region in which we

have considerable knowledge and experience. The Caserones team has achieved meaningful operational improvements in

recent years, and we will work to unlock additional upside through our strong technical resources and existing presence in

the region. The initial controlling interest increases our exposure to what we believe is a growing top -tier copper mining

district. We retain the option to further increase our ownership over the next few years at an attractive price. The Acquisition

further solidifies Lundin Mining’s position as a growing global producer of copper as the world shifts to a lower carbon

future.”

Caserones Overview

Caserones is a significant porphyry copper-molybdenum deposit in the Atacama Region (Region III) of the northern

Chilean Andean Cordillera, situated between the Maricunga and El Indio belts and is part of the emerging Vicuña

copper district. It is located approximately 160 km southeast of Copiapó, 9 km from the border with Argentina, and

at an altitude of approximately 4,500 meters above sea level. The operation produces copper and molybdenum

concentrates from a traditional open pit mine and conventional su lphide flotation plant, as well as copper cathode

from a dump leach, solvent extraction and electrowinning plant. First copper cathode was produced in 2013,

followed by copper and molybdenum concentrates in 2014. Climatic conditions and the physiology of t he high -

cordillera of the Chilean Andes support mining operations throughout the year.

Asset Highlights:

• Mine operations – traditional open-pit truck and shovel operation utilizing thirty-three haul trucks loaded by a

combination of two electric rope shovels, two hydraulic shovels, and two large front-end loaders.

• Processing – conventional crush, grind and flotation processing with a nominal capacity of 105 k tonnes per day

("tpd”), producing both copper in concentrates and molybdenum in concentrates, as well as a solvent extraction

and electrowinning (SX-EW) plant and leaching facilities for processing oxide and low -grade sulphide ore with a

production capacity of 34.5 kt of cathode per year (96 tpd). In 2022, the concentrator plant produced 109.1 kt of

copper in concentrate. In addition, 15.1 kt of copper cathode s and 3.1 kt of molybdenum in concentrate was

produced.

• Concentrate – clean copper concentrate with minimal impurities. Similarly, molybdenum concentrates meet the

quality standards for global sales.

• Operating cash costs2 – C1 cash costs of $2.22/lb and all-in sustaining cash costs (AISC) of $2.54/lb was reported

by Caserones for 2022.

• Mineral Reserves and Resources – a “historical estimate” (as defined in National Instrument 43-101 – Standards

of Disclosure for Mineral Projects (“NI 43-101”)) for copper Proven and Probable Mineral Reserves of 892.1 Mt at

an average grade of 0.33% copper containing approximately 2.9 Mt of copper and historical estimates for copper

Measured and Indicated Mineral Resources of 1.595 Bt at an average grade of 0.29% copper containing 4.583 Mt

of copper. A qualified person has not done sufficient work to classify these historical estimates as current Mineral

Resources or Mineral Reserves and Lundin Mining is not treating the historical estimate as current Mineral

Resources or Mineral Reserves. See below for further detail.

• Tailings facility (TSF) – tailings are managed in two separate facilities. The flotation tailings from the concentrator

plant are classified into coarse and fine fractions. The La Brea TSF, located a pproximately 9 km west of the

concentration plant, receives the fine s and the coarse fraction s are sent to the El Tambo sand stacking facility

2 Cash cost and AISC are non-GAAP measures and, although calculated according to accepted industry practice, these are not a standardized measure under IFRS and therefore

the disclosed cash costs and ASIC may not be directly comparable to other base metal producers. C1 Cash Cost is calculated from total costs and expenditures as reported by

SCM by removing the following costs: idle capacity, tailings construction, desalinated water, by-product credits (Mo & Ag), and exploration expenses and adding TC/RC to the

resulting figure. Costs and expenditures are comprised of the following costs: salary expenses, spare parts, consumables, electricity, subcontracts, general expenses,

desalinated water, freight & port, and net smelting return as reported by Lumina Copper. C1 Cash Costs (in US$ millions) is d ivided by total copper production to produce C1

Cash Costs per pound of copper (on a by-product basis). C1 Cash Costs (in US$ millions) plus sustaining capital costs is divided by total copper production to produce ASIC per

pound of copper (on a by-product basis). See the reconciliation at the end of this press release.

immediately adjacent to the concentrator plant. Due diligence was performed on the tailings facilities and related

infrastructure, led by Lundin Mining’s Technical Services Group.

• High-quality infrastructure – well-established supporting infrastructure includes a 160 km road to Copiapó,

access to maritime transportation channels for export ing concentrates and cathodes , a 220 kV power line

connection to the national grid, and water rights permitted for operational use.

• Communities and employees – experienced workforce and community relations team in place enabling good

relationships with local stakeholders.

Transaction Overview

The purchase price for the Acquisition will be paid in cash and will consist of an upfront payment of $800 million

subject to any adjustments from the effective locked box date of December 31, 2022, until closing. The remainder of

the cash consideration, of $150 million shall be paid to JX as follows: (A) $50 million shall be paid in five installments

of $10 million on the anniversary of the transaction closing date in each of 2024, 2025, 2026, 2027 and 2028; and (B)

$100 million shall be paid on the anniversary of the closing date in 2029, subject to certain adjustments as provided

for in the purchase agreement. The Acquisition is based on Lumina Copper containing zero debt and zero cash as of

the locked box date of December 31, 2022. The purchase price is expected to be funded from Lundin Mining’s

revolving credit facility.

Lundin Mining will also have the right to acquire up to an additional 19% interest in Caserones for $350 million, which

would bring total ownership to a maximum of 70%. Lundin Mining will be permitted to exercise the call option (in

increments or its entirety) one time per calendar quarter during the subsequent five-year period beginning on the

one year anniversary of the closing date.

Lundin Mining and JX shall each be entitled to a percentage of the copper production from the Caserones mine equal

to their respective percentage share ownership.

The Acquisition has been unanimously approved by the Board of Directors of both the Company and JX and is

expected to close in the third or fourth quarter 2023 subject to typical closing conditions, including third -party and

requisite regulatory approvals. The transaction does not require shareholder approval of either party.

Historical Estimates – April 20213

The historical estimates for Caserones are presented in the table below.

Grade Contained Metal

Category 000’s

Tonnes

Cu

%

Mo

%

Cu

Kt

Mo

Kt

Proven 419 0.35

Probable 473 0.31

Total 892 0.33 2,933

Measured 486 0.34 0.0129 1,659 63

Indicated 1,109 0.26 0.0097 2,924 108

M&I 1,595 0.29 0.0107 4,583 171

3 Mineral Resources are inclusive of Mineral Reserves.

The reported historical estimates above are based on the Caserones block model prepared by Golder Associates S.A.

(Golder) during 2018. The resource model update followed the 2017 infill drilling campaign. The estimation of the

grades was carried out by means of Ordinary Kriging and using GIL (Geological Information Limit).

The historical estimates do not use categories as defined in CIM Definition Standards. The Lumina Copper Annual

Reports include an annual “reserve statement” with no accompanying qualifying attributes or supporting

assumptions given. The most recent reserve statement is from Lumina Copper’s 2020 Annual Report and does not

provide the detailed assumptions for the estimation of its reported “reserves” but does state “ore reserves are

estimates of the amount of ore that can be economically and legally extracted from the company’s mining

properties”. As Caserones is an a ctive mining operation with production history, the Company believes that the

historical estimates are relevant in that they provide a general basis for establishing the mineralized material and

historical production statements. However, the historical estimates should not be relied upon until verified by a

qualified person. Compilation, review, and independent verification by qualified persons of geological, engineering,

metallurgical, economic, and other data that support ongoing mining operations will be required before the historical

estimate can be verified as current. This reserve statement predates the Company’s acquisition of its interest in

Caserones and is therefore considered to be a historical reserve estimate. A qualified person has not done sufficient

work to classify these historical estimates as current Mineral Resources or Mineral Reserves and Lundin Mining is

not treating the historical estimate as current Mineral Resources or Mineral Reserves.

Lundin Mining is currently undertaking the work to prepare current estimates and expects to announce a current

estimate and file a technical report for Caserones on its SEDAR profile in due course following this announcement.

The technical report is expected to contain current Mineral Resource and Mineral Reserve estimates and other

relevant information related to the Caserones mine.

Advisors and Counsel

Scotiabank acted as financial advisor to Lundin Mining and delivered an opinion to Lundin Mining’s Board of

Directors as to the fairness, from a financial point of view, of the consideration to be paid by Lundin Mining in the

transaction. Lundin Mining retained Cassels Brock & Blackwell LLP as C anadian legal advisors, Paul, Weiss, Rifkind,

Wharton & Garrison LLP as US legal advisors, and Bofill Mir Abogados and Bofill Escobar Silva Abogados as Chilean

legal advisors in connection with the transaction.

Technical Information

The qualified person for the scientific and technical information contained herein is Jeremy Weyland, P.Eng., Director,

Studies. Mr. Weyland, who is a "qualified person" as defined under NI 43 -101, has reviewed and approved the

technical information in this news release.

Conference Call and Webcast

The Company will hold a telephone conference call and webcast at 08:00 ET, 14:00 CET on

Tuesday, March 28, 2023. Conference call details are provided below:

Call-in number for the conference call (North America): +1 416 764 8658

Call-in number for the conference call (North America Toll Free): +1 888 886 7786

Call-in number for the conference call (Sweden): 0200899189

To view the live webcast presentation, please log on using this direct link:

https://viavid.webcasts.com/starthere.jsp?ei=1606322&tp_key=eac9d5210b

The presentation slideshow will also be available in PDF format for download from the Lundin Mining website

www.lundinmining.com before the conference call.

A replay of the telephone conference will be available after the completion of the conference call until March 28,

2024.

Replay numbers:

North America: +1 877 674 7070

Internationally: +1 416 764 8692

The passcode for the replay is: 200446

A replay of the webcast will be available by clicking on the direct link above.

About Lundin Mining

Lundin Mining is a diversified C anadian base metals mining company with operations and projects in Argentina,

Brazil, Chile, Portugal, Sweden and the United States of America, primarily producing copper, zinc, gold and nickel.

The information in this release is subject to the disclosure requirements of Lundin Mining under the EU Market

Abuse Regulation. The information was submitted for publication, through the agency of the contact persons set out

below on March 27, 2023 at 21:30 Eastern Time.

For further information, please contact:

Mark Turner, Vice President, Business Valuations and Investor Relations: +1 416 342 5565

Irina Kuznetsova, Manager, Investor Relations: +1 416 342 5583

Robert Eriksson, Investor Relations Sweden: +46 8 440 54 50

Reconciliation of Non-GAAP Measures

The Company uses certain performance measures in its analysis. These performance measures have no

standardized meaning within generally accepted accounting principles under International Financial Reporting

Standards and, therefore, amounts presented may not be comparable to similar data presented by other mining

companies.

Cash Cost and All-in Sustaining Cost can be reconciled to Caserones’ operating costs as follows:

Year ended December 31, 2022

Operation Caserones

($000s, unless otherwise noted) Total

Total payable copper (000 lbs) 267,409

Cost of sales $667,022

Add: Administrative expenses $113,497

Add: Selling and distribution expenses $30,296

Total $810,815

Less: Depreciation and other ($15,514)

Production costs $795,301

Less: Capitalized tailings costs ($40,760)

Less: Desalinated water ($34,600)

Less: Exploration ($3,958)

Add: Treatment and refining $36,482

Deduct: By-product credits ($157,494)

C1 cash cost $594,971

C1 cash cost per pound ($/lb) $2.22

Add: Capitalized tailings $40,760

Add: Sustaining capital $43,650

All-in sustaining cost $679,381

AISC per pound ($/lb) $2.54

Cautionary Statement on Forward-Looking Information

Certain of the statements made and information contained herein is “forward -looking information” within the meaning of applicable Canadian

securities laws. All statements other than statements of historical facts included in this document constitute forward-looking information, including

but not limited to statements regarding the Company’s plans, prospects and business strategies; statements with respect to th e intentions of the

Company regarding the Acquisition and other strategic growth opportunities, the anticipated timing and completion of the Acquisition, the abili ty

of Lundin Mining to complete the transactions contemplated by the Acquisition, life of mine, delivery of shareholder returns and value added by

projects. Words such as “believe”, “expect”, “anticipate”, “contemplate”, “target”, “plan”, “goal”, “aim”, “intend”, “continue”, “budget”, “estimate”, “may”,

“will”, “can”, “could”, “should”, “schedule” and similar expressions identify forw ard-looking statements. Forward-looking information is necessarily

based upon various estimates and assumptions including, without limitation, the expectations and beliefs of management, inclu ding that the

Company can access financing, appropriate equipmen t and sufficient labour; assumed and future price of copper, nickel, zinc, gold and other

metals; anticipated costs; ability to achieve goals; the prompt and effective integration of acquisitions; that the political environment in which the

Company operates will continue to support the development and operation of mining projects; and assumptions related to the factors set forth

below. While these factors and assumptions are considered reasonable by Lundin Mining as at the date of this document in light of management’s

experience and perception of current conditions and expected developments, these statements are inherently subject to signifi cant business,

economic and competitive uncertainties and contingencies.

Known and unknown factors could cause actual results to differ materially from those projected in the forward -looking statements and undue

reliance should not be placed on such statements and information. 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 mining including but not limi ted to risks to

the environment, industrial accidents, catastrophic equipment failures, unusual or unexpected geological formations or unstable ground conditions,

and natural phenomena such as earthquakes, flooding or unusually severe weather; uninsurable risks; risks associated with wat er rights, water

supply restrictions, the availability and access to water and water management str ategies; risks associated with environmental impact studies,

audits, investigations and compliance with remediation plans; project financing risks, liquidity risks and limited financial resources; volatility and

fluctuations in metal and commodity demand and prices; delays or the inability to obtain, retain or comply with permits; significant reliance on a

single asset; reputation risks related to negative publicity with respect to the Company or the mining industry in general; h ealth and safety risks;

risks relating to the development of the Josemaria Project; inability to attract and retain highly skilled employees; risks assoc iated with climate

change; compliance with environmental, health and safety laws and regulations; unavailable or inaccessible infrastructure, infrastructure failures,

and risks related to ageing infrastructure; risks inherent in and/or associated with operating in foreign countries and emerging markets, including

with respect to foreign exchange and capital controls; economic, politic al and social instability and mining regime changes in the Company’s

operating jurisdictions, including but not limited to those related to permitting and approvals, environmental and tailings m anagement, 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; changing taxation regimes; risks related to mine closure activ ities, 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 e stimation of Mineral

Resources and Mineral Reserves and the geology, grade and continuity o f mineral deposits including but not limited to models relating thereto;

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 or tailings storage facilitie s; activist shareholders

and proxy solicitation matters; risks relating to dilution; regulatory investigations, enforceme nt, sanctions and/or related or other litigation; risks

relating to payment of dividends; counterparty and customer concentration risks; the estimation of asset carrying values; risks associated with the

use of derivatives; relationships with employees and contractors, and the potential for and effects of labour disputes or other unanticipated

difficulties with or shortages of labour or interruptions in production; conflicts of interest; existence of a significant sh areholder; exchange rate

fluctuations; challenges or defects in title; internal controls; compliance with foreign laws; potential for the allegation of fraud and corr uption

involving the Company, its customers, suppliers or employees, or the allegation of improper or discriminatory employment pra ctices, or human

rights violations; the threat associated with outbreaks of viruses and infectious diseases; risks relating to minor elements contained in concentrate

products; and other risks and uncertainties, including but not limited to those described in the “Risk and Uncertainties” section of the annual

information form and the “Managing Risks” section of the Company’s MD&A for the year ended December 31, 2022, which are available on SEDAR

at www.sedar.com under the Company’s profile. All of the forwa rd-looking information made in this document are qualified by these cautionary

statements. Although the Company has attempted to identify important factors that could cause actual results to differ materi ally from those

contained in forward-looking information, there may be other factors that cause results not to be as anticipated, estimated, forecast or intended

and readers are cautioned that the foregoing list is not exhaustive of all factors and assumptions which may have been used. Should one or more

of these risks and uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary material ly from those

described in forward-looking information. Accordingly, there can be no assurance that forward-looking information will prove to be accurate and

forward-looking information is not a guarantee of future performance. Readers are advised not to place undue reliance on forward -looking

information. The forward-looking information contained herein speaks only as of the date of this document. The Company disclaims any intention

or obligation to update or revise forward ‐looking information or to explain any material difference between such and subsequent actual events,

except as required by applicable law.