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Endeavour Achieves Commercial Production at Biox Expansion and Lafigué Growth Projects

Production Results Mine Development & Operations

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NEWS RELEASE – LSE & TSX: EDV

ENDEAVOUR ACHIEVES COMMERCIAL PRODUCTION AT BIOX

EXPANSION AND LAFIGUÉ GROWTH PROJECTS

HIGHLIGHTS:

• Commercial production achieved on budget and on schedule at the Sabodala-Massawa BIOX Expansion

and the Lafigué mine on 1 August 2024

• Organic growth phase completed improving the quality of the portfolio and underpinning the transition

to a phase focused on free cash flow generation

• BIOX Expansion achieved c ommercial production ; operating with 9 4% plant availability at 80% of

nameplate capacity, with average recoveries of above 72% during July and August

• Lafigué mine achieved commercial production only one month after the first gold pour; operating with

87% plant availability at 72% of nameplate capacity, with average recoveries of above 95% during August

• The Group remains on track to achieve its full-year production guidance with AISC near the top end of the

guided range

London, 13 September 2024 – Endeavour Mining plc (LSE:EDV, TSX:EDV, OTCQX:EDVMF) (“Endeavour”, the

“Group” or the “Company”) is pleased to announce that it has achieved commercial production at both its

Sabodala-Massawa BIOX Expansion in Senegal and at its Lafigué mine in Côte d’Ivoire, effective as of 1 August

2024. Both projects have been completed on budget and on schedule, with the full ramp up to nameplate

capacity underway.

Ian Cockerill, CEO, commented: “We are pleased to have achieved commercial production at both of our organic

growth projects, fully de-risking construction and ramp-up activities. Both projects will drive stronger operating

performance in the second half of the year, underpinning our Group production guidance, while adding low-cost

production, extending mine life visibility, and increasing the geographic diversification of the portfolio.

I congratulate our entire in-house project’s team for the successful delivery of these two projects, and for their

continued industry leading project delivery over the last 10 years, successfully completing the construction of five

growth projects on budget and on schedule, all in under two years . We will now transition the team to focus on

our asset level optimisation initiatives and technical studies , ahead of our next growth phase, with the

construction of the potential tier one Assafou project from 2026.

The completion of this phase of growth is a significant milestone for Endeavour. With our higher quality portfolio,

we will transition to a phase focused on free cash flow generation that will support enhanced shareholder returns,

through additional supplemental returns, while we simultaneously reduce our leverage, as we continue to execute

on our strategy.”

Sabodala-Massawa BIOX Expansion

The BIOX Expansion achieved its first gold pour from the gravity circuit on 18 April 2024 and its first gold pour

from the BIOX circuit on 28 April 2024 . Commercial production was achieved on 1 August 2024, less than four

months after the first gold pour.

All circuits are operating in -line with expectations and during July and August combined , 160kt of ore was

processed at a grade of 2.8g/t gold. Processing rates exceeded 2,580 tonnes per day, equivalent to 80% of

nameplate capacity, and plant availability was above 94%. Average metallurgical recoveries were above 72% as

we processed lower grade transitional ore during the ramp up , while mining activities have now advanced into

fresh ore in the Massawa Central Zone, supporting higher grades and higher recovery rates for the remainder of

the year.

During July and August , throughput rate s, plant availability and recovery rates consistently exceeded our

commercial production criteria for a period of at least 30 days and a ll major capital expenditure has been

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completed with the project ’s construction team having now largely demobilised, completing the successful

handover to the operation’s team.

Figure 1: BIOX® processing plant overview

Lafigué Mine

The Lafigué processing plant achiev ed its first gold pour on 28 June 202 4 and commercial production was

achieved on 1 August 2024, approximately one month after the first gold pour.

All circuits are operating in-line with expectations and during August, 241kt of ore was processed at a grade of

1.8g/t gold. Processing rates exceeded 7,700 tonnes per day, equivalent to 72% of nameplate capacity and overall

plant availability was above 87% with average gold recovery rates above 95%.

During July and August, the throughput rate, plant availability and recovery rates exceeded our commercial

production criteria for a period of at least 30 days and the project’s construction team completed the handover

to the operation’s team.

Figure 2: Lafigué processing plant overview

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ABOUT THE SABODALA-MASSAWA MINE

The Sabodala-Massawa mine was acquired by Endeavour in February 2021, as part of its acquisition of Teranga.

Endeavour owns a 90% stake in the Sabodala-Massawa mine, with the remaining 10% owned by the Government

of Senegal.

Located approximately 630km east -southeast of Dakar, the capital of Senegal, the Sabodala -Massawa mine

consists of several open pit operations on the highly prospective Birimian Greenstone Belt. Non-refractory ore is

treated at a 4.0Mtpa CIL plant that ach ieved commercial production in November 2009. In 2021, Endeavour

expedited the completion of the initial upgrades at the existing CIL plant and simultaneously advanced the

definitive feasibility study for the addition of a refractory ore processing plant t o confirm the economic viability

of processing the high-grade refractory ores from the Massawa Central Zone and Massawa North Zone deposits.

In April 2022, Endeavour launched the construction of the 1.2Mtpa BIOX circuit to process the large refractory

ore resource with first gold achieved on 18 April 2024 and commercial production achieved on 1 August 2024. As

at 31 December 2023, Proven and Probable reserves totalled 53.1Mt at 2.05 g/t containing 3.5Moz of gold and

Measured and Indicated resources (inclusive of reserves) totalled 88.2Mt at 1.92 g/t containing 5.4Moz of gold.

For the full year ended 31 Dece mber 2023, Sabodala -Massawa produced 29 4koz at an AISC of $767/oz. As

previously guided, following the mining and processing of lower -than-expected grades with lower associated

recoveries through the CIL plant in H1-2024, Sabodala-Massawa production is expected to be below the bottom

end of its production guidance of 360k oz - 400koz at an all -in sustaining cost (“AISC”) above the top end of its

$750 - $850/oz guidance range. Production is expected to be strongly H2 -2024 weighted due to the ramp -up of

the BIOX expansion project.

Sabodala-Massawa is Endeavour’s largest exploration focus in 2024 with a guided spend of $2 5 million. The

exploration programme is focussed on converting existing resources to reserves and expanding non -refractory

and refractory resources for the existing CIL processing plant and the new BIOX® Expansion respectively. The

exploration programme remains on track to achieve its 5-year target of discovering an additional 2.3 - 2.7Moz of

Indicated resources by the end of 2025.

ABOUT THE LAFIGUÉ MINE

The Lafigué mine is located towards the northern end of the Birimian aged Oumé -Fetekro greenstone belt, in

north-central Côte d’Ivoire, approximately 500km from Abidjan by road. The Lafigué deposit is located in the

northeast part of the Fetekro exploration permit, adjacent to existing infrastructure, including sealed paved roads

and high voltage grid power. Endeavour has an 80% ownership stake in the Lafigué mine (with 10% owned by the

Ivorian Government and 10% owned by SODEMI, a state-owned mining company) and a 100% ownership stake in

the remainder of the Fetekro exploration licence.

Endeavour began exploration on the Fetekro property in March 2017, following a strategic assessment of its

exploration tenements which identified the project as a top priority target. To date, only a limited portion of the

Fetekro property has been explore d, as the priority has been the delineation of the Lafigué deposit. A maiden

Mineral Resource Estimate for the Lafigué deposit was published on 29 October 2018 and subsequently updated

on 3 September 2019, 18 August 2020 and 15 May 2022 . A Preliminary Econ omic Assessment (“PEA”) was

published on 18 August 2020 and a Preliminary Feasibility Study (“PFS”) was completed with the effective date of

31 December 2020.

Construction of the Lafigué project in Côte d'Ivoire was launched in Q4 -2022, following the completion of a

Definitive Feasibility Study (“DFS”) which confirmed Lafigué’s potential to be a cornerstone asset for Endeavour.

The 2022 DFS contemplates a 12.8 year LOM with average annual production of 203koz at a low AISC of $871/oz,

with an initial capital cost of $448 million. The project DFS displayed robust economics at an $1,800/oz gold price

assumption including an after-tax NPV5% of $870m and an after-tax IRR of 33%. First gold was poured on 28 June

2024 and commercial production was achieved on 1 August 2024. The Lafigué mine is expected to produce 90 -

110koz of gold at a sector leading AISC of $900-975/oz in H2-2024, inline with its initial guidance, with production

increasing to approximately 200koz in FY-2025.

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As at 31 December 2023, Proven and Probable reserves totalled 49.8Mt at 1.69 g/t containing 2.7Moz of gold and

Measured and Indicated resources (inclusive of reserves) totalled 46.2Mt at 2.04 g/t containing 3.0Moz of gold.

Given the strong exploration potential, Endeavour is targeting the discovery of 1.2 – 1.8Moz of Indicated resources

across the Lafigué mining permit and the wider Fetekro exploration permit area over the 2021 to 2025 period at

a discovery cost of $14/oz. To date 0.6Moz, or 50% of the lower end of the target, has been discovered.

QUALIFIED PERSONS

Ross McMillan, SVP Technical Services of Endeavour Mining plc., a Fellow of the Australasian Institute of Mining

and Metallurgy, is a "Qualified Person" as defined by National Instrument 43 -101 - Standards of Disclosure for

Mineral Projects ("NI 43-101") and has reviewed and approved the technical information in this news release.

CONTACT INFORMATION

Jack Garman

Vice President, Investor Relations

+44 203 011 2723

[email protected]

Brunswick Group LLP in London

Carole Cable, Partner

+44 207 404 5959

[email protected]

ABOUT ENDEAVOUR MINING PLC

Endeavour Mining is one of the world’s senior gold producers and the largest in West Africa, with operating assets

across Senegal, Cote d’Ivoire and Burkina Faso and a strong portfolio of advanced development projects and

exploration assets in the highly prospective Birimian Greenstone Belt across West Africa.

A member of the World Gold Council, Endeavour is committed to the principles of responsible mining and delivering

sustainable value to its employees, stakeholders and the communities where it operates. Endeavour is listed on

the London and Toronto Stock Exchanges, under the symbol EDV.

For more information, please visit www.endeavourmining.com.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING INFORMATION

This news release contains "forward -looking statements" within the meaning of applicable securities laws. All

statements, other than statements of historical fact, are "forward-looking statements". Generally, these forward-

looking statements can be identified by the use of forward -looking terminology such as "expects", "expected",

"budgeted", "forecasts", and "anticipates".

Forward-looking statements, while based on management's best estimates and assumptions, are subject to risks

and uncertainties that may cause actual results to be materially different from those expressed or implied by such

forward-looking statements, including but not limited to: risks related to the successful integration of acquisitions;

risks related to international operations; risks related to general economic conditions and credit availability, actual

results of current exploration activities, unanti cipated reclamation expenses; changes in project parameters as

plans continue to be refined; fluctuations in prices of metals including gold; fluctuations in foreign currency

exchange rates, increases in market prices of mining consumables, possible variat ions in ore reserves, grade or

recovery rates; failure of plant, equipment or processes to operate as anticipated; accidents, labour disputes, title

disputes, claims and limitations on insurance coverage and other risks of the mining industry; delays in th e

completion of development or construction activities, changes in national and local government regulation of

mining operations, tax rules and regulations, and political and economic developments in countries in which

Endeavour operates. Although Endeavou r has attempted to identify important factors that could cause actual

results to differ materially from those contained in forward -looking statements, there may be other factors that

cause results not to be as anticipated, estimated or intended. There can be no assurance that such statements will

prove to be accurate, as actual results and future events could differ materially from those anticipated in such

statements. Accordingly, readers should not place undue reliance on forward-looking statements. Please refer to

Endeavour's most recent Annual Information Form filed under its profile at www.sedar plus.ca for further

information respecting the risks affecting Endeavour and its business.