ENDEAVOUR ANNOUNCES POSITIVE DFS RESULTS FOR THE ASSAFOU PROJECT THAT UNDERPINS THE NEXT PHASE OF ORGANIC GROWTH

By GlobeNewswire On Apr 23, 2026

ENDEAVOUR ANNOUNCES POSITIVE DFS RESULTS FOR THE ASSAFOU PROJECT THAT UNDERPINS THE NEXT PHASE OF ORGANIC GROWTH

HIGHLIGHTS:
•	Definitive Feasibility Study confirms Assafou’s potential to become a cornerstore asset for Endeavour highlighting:
	>	320kozpa production at AISC of $1,026/oz over first 8 years.
	>	16-year mine life based on P&P reserves of 4.4Moz (77.4Mt at 1.76g/t); M&I resources of 5.0Moz (80.1Mt at 1.93g/t).
	>	Robust project economics with after-tax NPV_(5%) of $2.1bn and 28% IRR at a gold price of $2,500/oz, increasing to $5.1bn and 55% at a gold price of $4,000/oz.
	>	Upfront capital of $1,061m based on a scalable 5Mtpa design nameplate capacity gravity / CIL processing plant; increased upfront capital reflects changes to site infrastructure, plant optimisations to de-risk ramp-up and to enable seamless plant expansion in the future.
•	Significant exploration potential with over 20 highly prospective targets defined:
	>	Assafou deposit (5.0Moz M&I resource) mineralisation is open along strike and at depth; Pala Trend 3 (0.2Moz maiden M&I resource) satellite located 1km away is mineralised from surface.
	>	Assafou is the first discovery in a highly prospective and underexplored belt.
•	Early works launched including long-lead orders, detailed engineering and design, and key tenders.
•	Final investment decision targeted before end-2026, with subsequent 24 – 30 month construction.
•	Assafou underpins the Group’s sector-leading organic growth outlook to 1.5Moz, at first quartile AISC, by 2030.

Abidjan, 23 April 2026 – Endeavour Mining plc (LSE:EDV, TSX:EDV, OTCQX:EDVMF) (“Endeavour”, the “Group” or the “Company”) is pleased to announce the results of the Definitive Feasibility Study (“DFS”) for the Assafou-Dibibango (“Assafou”) project on the Tanda-Iguela property in Côte d’Ivoire.

Ian Cockerill, Chief Executive Officer, commented: “We are pleased with the results of the Assafou project DFS, which confirms the quality and scale of the asset that will underpin the next phase of Endeavour’s organic growth.

Assafou has the potential to become another cornerstone asset for Endeavour, adding 320koz of production per year at a first quartile AISC of $1,026/oz, over the first eight years of its 16-year mine life. It will be our lowest-cost and longest-life mine, further improving our portfolio quality while bolstering the resilience of the business.

The impressive project economics demonstrate our ability to rapidly generate value through the drill bit. Assafou was discovered for $13 million in 2022 and only four years later has a value of $5.1 billion at a $4,000/oz gold price. As we continue to de-risk the project and grow its resource base through exploration, we expect to unlock even more value.

Since its discovery, the Assafou M&I resource has grown 470%, to over 5 million ounces, and we are increasingly excited by more than 20 highly prospective satellite targets, in close proximity to the deposit.

Working closely with our supportive in-country stakeholders, we are advancing the project’s mining convention, and we are targeting a final investment decision before the end of the year. Simultaneously, we have launched early works, detailed engineering and design, key tenders and long-lead orders to expedite construction.

As we advance Assafou, we will remain disciplined and prioritise maximising free cash flow from every ounce of gold we produce, ensuring that we continue to deliver sector leading shareholder returns, while we organically grow production to 1.5 million ounces by 2030.”

*Table 1: Assafou Project Highlights*
		ASSAFOU DFS	STRATEGIC TARGETS
P&P Reserve, Moz¹		4.4	>3.0
Mine life, years		16	>10
Average annual production, kozpa	First 8 years	320	>200
	Life of mine	257
AISC, $/oz²	First 8 years	1,026	1st quartile
	Life of mine	1,062
Post-tax NPV_5%,$m²		2,059	n.a.
Post-tax IRR, %²		28	>20
^{¹Based on a $1,500/oz reserve price. ²Based on a gold price of $2,500/oz.}

The key operational and economic highlights of the Assafou DFS are summarised in Tables 2 and 3 below.

*Table 2: Assafou DFS Summary*
OPERATION TYPE
Mine type	Open Pit
Plant type	5.0Mtpa Gravity / CIL Plant
RESERVES & RESOURCES¹
P&P reserves	77.4Mt at 1.76g/t Au for 4.4Moz
M&I resources (inclusive of reserves)	80.1Mt at 1.93g/t Au for 5.0Moz
Inferred resources	0.9Mt at 2.34g/t Au for 0.1Moz
LIFE OF MINE PRODUCTION
Mine life, years	16
Strip ratio, W:O	6.3
Tonnes processed, Mt	77.4
Grade processed, Au g/t	1.76
Gold contained processed, Moz	4.4
Average recovery rate, %	94
Gold production, Moz	4.1
Average annual production, kozpa	257
Cash costs, $/oz²	952
AISC, $/oz²	1,062
AVERAGE FOR YEARS 1 TO 8
Production, kozpa	320
Cash costs, $/oz	887
AISC, $/oz²	1,026
CAPITAL COST
Upfront capital cost, $m	1,061
ENVIRONMENTAL DATA
GHG Emissions Intensity³, t CO2e/oz	0.59
Energy Intensity, GJ/oz	7.39
^{¹Based on a reserves gold price of $1,500/oz and a resource gold price of $1,900/oz. Reserves and Resources relates to the}^{Assafou Project and are exclusive of Pala Trend 3 Resources. ²Based on a gold price of $2,500/oz. ³GHG Emissions Intensity}^{considers only Scope 1 and 2 emissions.}

*Table 3: Assafou DFS Project Economics*

Gold Price	$2,000/oz	$2,500/oz	$3,000/oz	$4,000/oz
PRE-TAX
NPV_5%, $m	1,625	2,909	4,250	6,934
IRR, %¹	23	34	45	66
Payback Period, yr¹	4.14	3.01	2.43	1.81
AFTER-TAX
NPV_5%, $m	1,074	2,059	3,077	5,113
IRR, %¹	18	28	37	55
Payback Period, yr¹	4.97	3.52	2.73	1.95
^{¹Payback period and IRR are calculated from the start of commercial production}

Endeavour expects to file a Technical Report pursuant to National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“the NI 43-101”) in respect of the Assafou DFS within 45 days of this news release.

Overview

The 100% owned Tanda and Iguela exploration permits (“Tanda-Iguela”) are located in the eastern region of Côte d’Ivoire, approximately 280km northeast of Abidjan, adjacent to the Ghana border. The northern permit, Tanda, was added to Endeavour’s portfolio in November 2015 following the combination of La Mancha’s Ivorian assets with Endeavour. Endeavour conducted an initial drilling campaign during 2016 that yielded positive results and quickly identified the southern permit, Iguela, as having a high degree of geological prospectivity. The Iguela permit was awarded to Endeavour in May 2017, through Côte d’Ivoire’s permit application process.

Figure 1: Tanda-Iguela Regional Map

A maiden Indicated resource of 1.1Moz (14.9Mt at 2.33 g/t Au) was published on 21 November 2022, based on 56,000 metres of drilling, and was subsequently increased to 4.5Moz (70.9Mt at 1.97 g/t Au) on 29 November 2023, based on an additional 123,000 metres of drilling. Further exploration and advanced grade control drilling at the Assafou deposit and exploration drilling at the Pala Trend 3 satellite deposit resulted in an increase in Measured and Indicated resources to 5.2Moz at 1.91g/t as of 31 December 2025. These resources are based on an additional 99,000 metres of drilling and include maiden Measured resources, reflecting increased resource confidence.

As shown in Figure 2 below, the DFS demonstrates Assafou’s potential to deliver 320kozpa at all-in sustaining cost (“AISC”) of $1,026/oz over the first eight years of operations, with average production of 257kozpa and AISC of $1,062/oz over the 16-year life of mine.

Figure 2: Assafou DFS Production and AISC Profile¹

¹AISC based on a gold price of $2,500/oz

The DFS production profile is based on the Assafou deposits’ mineral reserves only, with an effective date of 31 December 2025. The DFS production profile excludes mineral resources outside of reserves and excludes the maiden Measured and Indicated mineral resource of 4.7Mt at 1.55g/t for 0.2Moz at the Pala Trend 3 satellite deposit, that was defined following successful exploration drilling during 2025. Furthermore, nearly 70,000 metres of exploration drilling has been completed at nearby satellite deposits, which is expected to contribute to further resource and reserve increases supporting higher levels of production, particularly in years 12 to 16 of the production profile.

Reserves and Resources

The Assafou Project’s 31 December 2025 reserve and resource estimate is shown in Table 4 below. The resource estimate is based on a gold price of $1,900/oz and the reserve estimate is based on a conservative gold price of $1,500/oz.

*Table 4: Assafou Project Reserves and Resources*
	Tonnage	Grade	Content
On a 100% basis	(Mt)	(Au g/t)	(Au koz)
Assafou Deposit (DFS)
Proven Reserves	21.5	1.87	1,295
Probable Reserves	55.9	1.72	3,085
P&P Reserves	77.4	1.76	4,379
Measured Resource (incl. reserves)	20.8	2.05	1,367
Indicated Resources (incl. reserves)	59.4	1.89	3,606
M&I Resources	80.1	1.93	4,972
Inferred Resources	0.9	2.34	69
Pala Trend 3
Proven Reserves	–	–	–
Probable Reserves	–	–	–
P&P Reserves	–	–	–
Measured Resource (incl. reserves)	–	–	–
Indicated Resources (incl. reserves)	4.7	1.55	231
M&I Resources	4.7	1.55	231
Inferred Resources	1.0	1.68	53
Total Assafou Project
Proven Reserves	21.5	1.87	1,295
Probable Reserves	55.9	1.72	3,085
P&P Reserves	77.4	1.76	4,379
Measured Resource (incl. reserves)	20.8	2.05	1,367
Indicated Resources (incl. reserves)	64.0	1.86	3,837
M&I Resources	84.8	1.91	5,203
Inferred Resources	1.9	2.00	122

¹Mineral Resource Estimate effective 31 December 2025. Mineral Reserve Estimate effective 31 December 2025. Mineral Resource and Reserve Estimates follow the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) Definitions Standards for Mineral Resources and Reserves and have been completed in accordance with the Standards of Disclosure for Mineral Projects as defined by National Instrument 43-101. Reported tonnage and grade figures have been rounded from raw estimates to reflect the relative accuracy of the estimate. Minor variations may occur during the addition of rounded numbers. Mineral Resources that are not Mineral reserves do not have demonstrated economic viability. Resources were constrained by MII Pit Shell based on a cut-off grade of 0.40g/t at a $1,900/oz gold price. Reserves are based on a cut-off grade of 0.40g/t for oxide, laterite and transitional ore and 0.50g/t for fresh ore and $1,500/oz gold price. Endeavour is not aware of any legal, political, environmental or other risks that could materially affect the potential development of the mineral resources and mineral reserves other than as noted herein.

For technical notes and drilling results from the Assafou drill programme, please see the Technical Notes section below.

Mining Operations

The Assafou deposit mineralisation extends from surface to depths in excess of 300 metres and is amenable to conventional open-pit, drill and blast, mining. The mine planning, resource and cost estimation for the DFS is based on a contract mining operation with a maximum mining capacity of 53.0 Mt per year, that is expected to be achieved 5 months after the commencement of mining. Mining capacity is expected to exceed processing capacity in order to accumulate stockpiles to allow high grade material to be preferentially processed early in the mine plan.

During the pre-commercial production period approximately 49.3 Mt of pre-stripping is expected to support an accelerated production ramp up. The projects and operations teams will review opportunities to reduce the impact of pre-stripping at the Assafou deposit through supplementing the ore feed with near-surface ore from the Pala Trend 3 deposit, located 1km southwest of the Assafou deposit, as well as additional satellite deposits in close proximity to the Assafou deposit.

Ore mining is expected to occur in 15-metre benches and 6.0 x 2.5-metre flitches in fresh rock, while waste is expected to be mined in 5-metre flitches. Smaller excavators will be used for ore loading to decrease dilution.

Diesel excavators and dump trucks will be used for loading and haulage, with a contractor fleet expected to comprise of 300-tonne class face excavators for waste mining, and 150-tonne class excavators for ore mining.

Processing Operations

Ore will be processed via a 5.0 Mtpa gravity / carbon-in-leach (“CIL”) processing plant. Over the life of mine, the plant will be fed with approximately 88% fresh ore and 12% oxide and transitional ore.

The comminution circuit is expected to comprise of two-stage crushing followed by a high-pressure grinding roll and a ball milling circuit. A primary gyratory crusher will crush ore to a coarse crush size, followed by dual secondary cone crushers. A live primary crushed ore stockpile will provide a buffer storage of primary crushed ore, with reclaim to feed the secondary crushing unit. Ore will then be fed through the high-pressure grinding roll circuit that feeds the ball mill. In the event that the secondary crushers or the high-pressure grinding roll circuits are offline, a fines stockpile located after the high-pressure grinding roll circuit will ensure there is feed available for the ball mill. The ball mill will mill the ore to 80% passing 106µm (microns).

The milled ore will pass through a gravity circuit comprising two Knelson concentrators for separation and recovery of coarse free gold, to produce a gravity concentrate for cyanidation and electrowinning that can be smelted to produce gold doré. High gravity recovery of approximately 70% is estimated.

Coarse feed is returned to the ball mill while screened cyclone overflow is passed via the leach feed thickener to a CIL circuit containing one pre-leach tank and six CIL tanks, in series, for leaching and absorption. Leach residence time will be approximately 36 hours. Following leaching and absorption, gold will be recovered from activated carbon by elution, electrowinning, and gold smelting to produce gold doré.

Extensive multiphase metallurgical test work has demonstrated that ore from the Assafou deposit contains free-milling gold, with a high proportion of gravity recoverable gold, that is amenable to cyanidation. The majority of the remaining gold has a high leach extraction potential resulting in an overall gold recovery rate of 94% over the life of mine.

Operating Cost Summary

Mining operating costs, which are based on Q3-2025 estimates, were prepared by Endeavour, are based on a contractor mining model. Process operating cost estimates were prepared by Lycopodium Minerals Canada Ltd (Lycopodium), who have successfully supported Endeavour through five engineering and construction projects in West Africa over the last twelve years. General and Administration (“G&A”) cost estimates were also prepared by Endeavour, as summarised in the table below.

*Table 5: Assafou Project Life of Mine Operating Unit Costs (-10/+15%)*
	UNIT COSTS (US$)
Open Pit Mining and Rehandling	$4.11/t mined
Processing	$14.38/t processed
G&A	$4.48/t processed
Based on Q3-2025 estimates that exclude escalation.

Operating costs have been based on a delivered diesel price of $1.13 per litre and are in line with current local pricing and, therefore do not reflect any potential pricing impact from current hostilities in the Middle East. Power will be sourced from the grid supplying 90kV to site via a ring main system providing power from two different parts of the power grid to increase reliability with an assumed grid availability of 90% and power costs estimated at $0.13/kWh.

Capital Cost and Infrastructure Summary

The project upfront capital cost, which is based on Q3-2025 estimates, was compiled by Lycopodium with input from Knight Piésold Pty Ltd (Knight Piésold) on the tailings storage facility (“TSF”), water infrastructure, site access roads and airstrip, SRK Consulting (UK) Ltd (SRK) for mining cost models and contractor rates, Digby Wells Environmental Holding Ltd (Digby Wells) for RAP costs, compensation and closure costs, Cabinet Enval SARL (ENVAL) for environmental assessments, and from ECG Engineering Pty Ltd (ECG Engineering) on the power infrastructure. Endeavour has provided project specific estimates for mine establishment, facilities, power and owner’s costs.

The initial capital cost is summarized in the table below.

*Table* 6: Assafou Project Upfront Capital Cost Estimate Summary (-10/+15%)
	CAPITAL COSTS (US$M)
Pre-production Mining	111.4
Processing Plant Costs	155.8
Reagents and Plant Services	30.9
Site Infrastructure	250.2
Contractor Distributables	65.4
Owner Project and Operations Costs	215.7
Management Costs	50.7
Subtotal	880.1
Pre-production Working Capital	76.3
Contingency	85.4
Taxes and Duties	18.8
Total Upfront Capital Cost	1060.6
Based on Q3-2025 estimates that exclude escalation.

The Assafou project capital cost estimate assumes a contractor mining model, selected due to the additional fleet flexibility that can accommodate the pre-production mining ramp-up and the potential incorporation of satellite deposits into the mine plan.

The Assafou project benefits from good surrounding infrastructure, including access to the 90kV ring main power supply, which will be diverted via a new 12km transmission line, and access to the A1 national road, which will be diverted via an assumed 55km extension around the operation. In addition, backup power comprised of 28 containerised diesel generators with prime output of 28.0MW has been included in the upfront capital costs. Furthermore, land provision within the existing mine perimeter for a potential 31.5MW solar power plant has been provided. The airstrip will be built 10km from the site’s permanent accommodation. Resettlement of two villages, within close proximity to the project, is required and is included in the upfront capital cost estimate. The tailings storage facility (“TSF”) is expected to be a High-Density Polyethylene (“HDPE“) lined cross-valley storage facility, utilising the natural topography of the project area, that will be formed by multi-zoned earth fill embankments, with a total footprint area (including the basin area) of approximately 239ha for the stage 1 TSF to 265ha for the final TSF. TSF construction will benefit from the high availability of fresh waste rock from the mining pre-stripping activities. The TSF is designed to a life-of-mine capacity accommodating a total of 72.0Mt of tailings. The Stage 1 TSF is designed for 7.5Mt, approximately 18 months storage capacity, and subsequently, downstream raise construction will be used to progressively increase capacity.

Estimated resettlement disbursements and related costs are included in the Owner Project and Operations Costs. These estimates are based on a combination of legislated compensation mechanisms and historic precedents of similar costs. Final costs are subject to negotiation and agreement between various stakeholders, including the State of Côte d’Ivoire and local communities.

Figure 3 below highlights the proposed site and infrastructure layout.

Figure 3: Assafou Project Schematic Site Layout

Ownership, Permitting, Taxes and Royalties

Endeavour acquired the Tanda exploration permit in 2015, subsequently acquiring the Iguela exploration permit, which contains the Assafou project, in 2017. The exploitation permit for the Assafou project was granted in February 2026. Once the new project company is fully incorporated with the State of Côte d’Ivoire as a shareholder in accordance with Ivorian law, the exploitation permit will be transferred to that company. The current Mining Code envisages a State free carried interest of 10%.

A corporate tax rate of 25% of gross profit, a royalty rate of 8.0% above a gold price of $2,000/oz and a local development fund contribution of 0.5% of gold sales were applied in the DFS. Gold royalties in Côte d’Ivoire are based on a sliding scale with the gold price and vary between 5.0% and 8.0%. A transport and refining charge of $4/oz Au was also applied.

The Mining Code in Côte d’Ivoire is currently under review, and if the proposed new Mining Code, is passed into law before the Assafou mining convention is granted, then the level of State participation and the fiscal terms applicable to the Assafou project may reflect those of the new Mining Code.

Timetable, Early Works and Project Construction

A 24 to 30 month construction period is projected following the final investment decision, which is targeted before the end of 2026. The final investment decision and the construction period do not reflect any potential impact from current hostilities in the Middle East.

As shown below in Figure 4, commencement of procurement for long-lead items, detailed engineering and design, and the EPCM, power and earthworks tenders are already underway.

For FY-2026, growth capital guidance of between $50 – 100 million is expected to be incurred prior to the approval of the final investment decision. The remaining $961 – 1,011 million of the $1,061 million upfront capital is expected to be incurred after the final investment decision.

Following the final investment decision, construction is expected to start, initially prioritising the resettlement, which is on the critical path, and the site infrastructure and earth works. Subsequently tailings and water dam construction, then power supply and process plant construction will commence.

The critical path includes the resettlement, mining pre-stripping and process ore commissioning. The resettlement is required to commence mining pre-stripping. Mining pre-stripping is expected to start approximately five quarters after the final investment decision, in order to provide access to thick, high-grade zones of the ore body early, and support a short processing plant and production ramp-up.

^* Critical path items.

Next steps

Q2-2026: Procurement of long-lead items has been launched.
Q2-2026: Detailed engineering and design is underway.
Q2-2026: EPCM, power and earthworks tender reviews are advancing towards finalisation.
Q2-2026: Development of the relocation action plan is underway to support the resettlement.
Q3-2026: Expected completion of mining convention negotiations.
End-2026: Final investment decision is targeted before the end of 2026.

2026 DFS vs 2024 PFS

The key changes between the Assafou PFS news release published on 11 December 2024 and the Assafou DFS news release published on 23 April 2026 are highlighted in table 7 below. These include the increase in resource and reserve endowment following successful exploration, the increase in processing unit costs reflecting current costs assumptions across the portfolio, and the increase in upfront capital resulting from scope changes to infrastructure as well as plant optimisations, scalability and ramp-up de-risking.

*Table 7: Assafou Project DFS vs PFS Highlights*
	DFS	PFS	DFS VS PFS
PLANT TYPE, SIZE & CAPEX
Plant type	Gravity / CIL	Gravity / CIL
Mill capacity, Mtpa	5.0	5.0	−
RESERVES & RESOURCES⁴
P&P Reserves, koz	4,379	4,115	+6%
M&I Resources, koz	4,972	4,604	+8%
Inferred Resources, koz	69	208	(67)%
LIFE OF MINE PRODUCTION
Mine life, years	16	15	+7%
Strip ratio, W:O	6.3	5.9	+7%
Tonnes processed, Mt	77.4	72.8	+6%
Grade processed, Au g/t	1.76	1.76	−
Gold contained processed, Moz	4.4	4.1	+6%
Average recovery rate, %	94	94	−
Gold production, Moz	4.1	3.9	+5%
CAPITAL AND OPERATING COSTS
Upfront capital cost, $m	1,061	734	+45%
Open Pit Mining & Rehandling, $/t mined	4.11	4.08	+1%
Processing, $/t processed	14.38	12.25	+17%
G&A, $/t processed	4.48	4.10	+9%
AVERAGE FOR YEARS 1 TO 8
Average annual production, kozpa	320	327	(2)%
Cash costs, $/oz¹	887	854	+4%
AISC, $/oz¹	1,026	949	+8%
ENVIRONMENTAL DATA
GHG Emissions Intensity², t CO2e/oz	0.59	0.55	+7%
Energy Intensity, GJ/oz	7.39	7.23	+2%
ECONOMICS _{(BASED ON $2,}₅₀₀_/oz)
Pre-Tax Returns
NPV₅_%,$m	2,909	3,408	(15)%
IRR, %	34	48	(29)%
Payback, years³	3.0	2.4	25%
After-Tax Returns
NPV_5%,$m	2,059	2,485	(17)%
IRR, %	28	40	(30)%
Payback, years³	3.5	2.7	30%
^{¹ AISC}^{and cash costs based on a gold price of $2,000/oz. Sliding scale royalty rates from $2,500/oz have increased from 6% per the PFS to 8% in the DFS. ²GHG Emissions Intensity calculated as Scope 1 and 2 emissions. ³ Payback period calculated starting from start of commercial production. ⁴ Based on a reserves gold price of $1,500/oz and a resource gold price of $1,900/oz. Reserves and Resources relates to the Assafou Project and are exclusive of Pala Trend 3 Resources.}

Table 8 demonstrates a significant uplift in resource and reserve size and confidence within the Assafou deposit. P&P reserves at the Assafou deposit increased by 6% while M&I resources increased by 8%, following 99,000 metres of additional drilling both within, and outside of, the Assafou pit shell, subsequent to the completion of the PFS.

This additional drilling also supported improved reserve and resource confidence, which is reflected by the addition of maiden Proven reserves of 21.5Mt at 1.87g/t for 1.3Moz alongside maiden Measured resources of 20.8Mt at 2.05g/t for 1.4Moz, which cover 40% of the first five years of the mine plan. This improvement is underpinned by closer spaced drilling at 20 x 25 metre spacing, compared to previous drilling at 33 x 40 metre spacing and 100 x 80 metre spacing that supported the PFS and the maiden resources respectively. The increased reserve and resource confidence supports de-risking of the ramp up and the first five years of the mine plan.

*Table 8: Assafou Project Mineral Reserves and Resources*¹
	31 December 2025²			31 December 2024³			VARIANCE
On a 100% basis. M&I Resources shown inclusive of Reserves.	Tonnage	Grade	Content	Tonnage	Grade	Content	Au Content
	(Mt)	(Au g/t)	(Au koz)	(Mt)	(Au g/t)	(Au koz)	(Au koz)
Proven Reserves	21.5	1.87	1,295	–	–	–	+1,295
Probable Reserves	55.9	1.72	3,085	72.8	1.76	4,115	-1,030
P&P Reserves	77.4	1.76	4,379	72.8	1.76	4,115	+264
Measured Resource (incl. reserves)	20.8	2.05	1,367	–	–	–	+1,367
Indicated Resources (incl. reserves)	59.4	1.89	3,606	73.6	1.95	4,604	-998
M&I Resources (incl. reserves)	80.1	1.93	4,972	73.6	1.95	4,604	+368
Inferred Resources	0.9	2.34	69	3.3	1.97	208	-139
^{¹Excludes maiden Mineral resource Estimate for the Pala Trend 3 deposit, which is excluded from the DFS mine plan. ²Mineral resource Estimate effective 31 December 2025. Mineral Reserve Estimate effective 31 December 2025. Mineral Resource and Reserve Estimates follow the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) Definitions Standards for Mineral Resources and Reserves and have been completed in accordance with the Standards of Disclosure for Mineral Projects as defined by National Instrument 43-101. Reported tonnage and grade figures have been rounded from raw estimates to reflect the relative accuracy of the estimate. Minor variations may occur during the addition of rounded numbers. Mineral resources that are not Mineral Reserves do not have demonstrated economic viability. Resources were constrained by MII Pit Shell based on a cut-off grade of 0.40g/t at a $1,900/oz gold price. Reserves are based on a cut-off grade of 0.40g/t for oxide, laterite and transitional ore and 0.50g/t for fresh ore and $1,500/oz gold price. ³Mineral resource estimate effective 31 December 2024. Mineral reserve estimate effective 31 December 2024. Mineral resource and reserve estimates follow the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) Definitions Standards for Mineral Resources and Reserves and have been completed in accordance with the Standards of Disclosure for Mineral Projects as defined by National Instrument 43-101. Reported tonnage and grade figures have been rounded from raw estimates to reflect the relative accuracy of the estimate. Minor variations may occur during the addition of rounded numbers. Mineral Resources that are not mineral reserves do not have demonstrated economic viability. Resources were constrained by MII Pit Shell based on a cut-off grade of 0.5g/t at a $1,900/oz gold price. Reserves are based on a cut-off grade of 0.40g/t for oxide ore and 0.50g/t for fresh ore and $1,500/oz gold price. Endeavour is not aware of any legal, political, environmental or other risks that could materially affect the potential development of the mineral resources and mineral reserves other than as noted herein.}

The updated mineral resource estimate for the Assafou deposit, based on a gold price of $1,900/oz is robust, given its high-grade, thickness and continuity, as demonstrated by the sensitivity analysis presented in Table 9.

*Table 9: Assafou Deposit Mineral Resource Estimate Sensitivity*¹
	Tonnage	Grade	Content
Measured Resource	(Mt)	(Au g/t)	(Au koz)
Based on a gold price of $1500/oz	20.2	2.05	1,334
Based on a gold price of $1900/oz	20.8	2.05	1,367
Based on a gold price of $2000/oz	20.8	2.05	1,370
Based on a gold price of $2100/oz	20.9	2.04	1,372
Based on a gold price of $2500/oz	20.9	2.04	1,375
Based on a gold price of $3000/oz	21.0	2.04	1,382
Indicated Resource
Based on a gold price of $1500/oz	54.0	1.92	3,328
Based on a gold price of $1900/oz	59.4	1.89	3,606
Based on a gold price of $2000/oz	60.1	1.88	3,635
Based on a gold price of $2100/oz	60.3	1.88	3,645
Based on a gold price of $2500/oz	62.3	1.87	3,738
Based on a gold price of $3000/oz	63.3	1.86	3,777
Inferred Resource
Based on a gold price of $1500/oz	0.6	2.46	46
Based on a gold price of $1900/oz	0.9	2.34	69
Based on a gold price of $2000/oz	1.0	2.28	72
Based on a gold price of $2100/oz	1.0	2.25	74
Based on a gold price of $2500/oz	1.4	2.20	97
Based on a gold price of $3000/oz	1.7	2.14	115

^{¹Mineral resource estimate effective 31 December 2025. Mineral reserve estimate effective 31 December 2025. Mineral resource and reserve Estimates follow the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) Definitions Standards for Mineral Resources and Reserves and have been completed in accordance with the Standards of Disclosure for Mineral Projects as defined by National Instrument 43-101. Reported tonnage and grade figures have been rounded from raw estimates to reflect the relative accuracy of the estimate. Minor variations may occur during the addition of rounded numbers. Mineral resources that are not mineral reserves do not have demonstrated economic viability. Resources were constrained by MII Pit Shell based on a cut-off grade of 0.40g/t at a $1,900/oz gold price. Reserves are based on a cut-off grade of 0.40g/t for oxide, laterite and transitional ore and 0.50g/t for fresh ore and $1,500/oz gold price.}

As illustrated in the figure 6 below, Assafou’s mine life has been extended by approximately one year due to the increase in P&P reserves, while its average annual production and cost profile remain similar to the PFS.

Figure 6: Assafou Project DFS vs PFS Production Profile¹

^{¹AISC based on a gold price of $2,500/oz}

The upfront capital cost for the project has increased from $734 million in the PFS to $1,061 million in the DFS. As shown in table 10 below, the increase in upfront capital is related to scope changes to infrastructure as well as plant optimisations, scalability and ramp-up de-risking.

*Table 10: Assafou Project PFS – DFS Capital Cost Changes*
Capital cost changes	PFS vs DFS	Rationale
Site infrastructure: +$130.3m	Improved backup power in the DFS incorporating containerised diesel generators with a more robust design comprised of 28 generators with prime output of 28.0MW. Increase in length of the national highway diversion from the original 22km in the PFS to an assumed 55km in the DFS. Addition of a 10km 33kV power line connecting the Iguela, Assafo, Dibibango and Broukro villages to the grid following mine development. Addition of digital optimisations have been included in the upfront capital.	Improved backup power is engineered and capable of supporting the full load requirements in the event that there are any outages or capacity constraints on the grid. The increased diversion length to the East of the Assafou project is fully aligned with the updated infrastructure layout and supports current Government and local community preferences. The additional power line ensures power supply is maintained to local villages and infrastructure following the relocation and mine development. Digitalisation opportunities are expected to drive life of mine operating costs savings and improved productivity.
Owner project and operations costs: +$91.3m	Owners costs have been increased to account for continued support from the in-house projects team following the completion of commissioning through to the completion of the processing plant ramp-up.	Retaining the in-house projects team as well as key consultants and contractors on site and associated costs, following commissioning for the processing plant ramp up, helps de-risk the ramp up and the first year of production.
Processing plant costs: +$49.5m	Modifications in processing plant flow sheet based on learnings from Lafigué ramp-up, including optimising conveyors, increased crushed ore screens and replacement of the crushed ore stockpile, subsequent to the secondary crushing circuit with a stockpile after the -HPGR. Increase in secondary crusher capacity from two Metso 3.0mtpa capacity HP6 secondary crushers in the PFS to two Metso 5.0mtpa capacity HP900 secondary crushers in the DFS.	Flow sheet optimisation is expected to improve processing plant performance and build in additional redundancy, minimising downtime. The addition of the stockpile after the HPGR allows milling activity to continue in the event the crushing or HPGR circuit is down for maintenance or repair. Larger secondary crushers provide capacity to increase throughput beyond processing plant nameplate and ensure that the processing plant can operate at nameplate capacity in the event that one of the secondary crushers is down for repair or maintenance.
Pre-production mining and pre-production working capital: +$37.7m	Optimisation of the mine plan following 99,000 metres of additional advanced grade control drilling. Mine plan optimisation also resulted in earlier mobilisation of the mining contractor and 35% increased pre-production waste stripping.	Advanced grade control drilling covering the first 18 months of production to de-risk the operational ramp-up. Supports access to a higher-grade zone of the ore body earlier in the mine plan helping to de-risk the mining ramp up.
Contractor distributables: +$20.5m	Alignment of construction distributables to reflect changes to direct capital costs.	Improves confidence in growth capital expenditure budget by updating earthwork, concrete, steel and other construction distributable rates.
Management costs: -$2.8m	Finalisation of EPCM management costs. Savings associated with sterilisation drilling.	Finalisation of EPCM and owners cost scope. Completion of sterilisation drilling earlier than initially planned resulted in upfront capital savings.

Geology

Mineralisation at the Assafou deposit is both hosted in quartz veins and disseminated within the Tarkwaian Sandstones. The deposit appears to be monometallic, with no potentially deleterious elements associated with the gold. Mineralisation starts at surface and extends to depths of more than 300 metres. It is continuous along strike, following a prominent northwest-trending structure that separates the Tarkwaian Sandstones from the mafic Birimian Basement rocks. The deposit comprises a thick main (up to 100 metres), flat-lying, continuous lens, overlain by a series of stacked lenses dipping at a low angle to the northeast.

High grade mineralisation and the thickest mineralised intercepts are located adjacent to the structural contact between the mafic Birimian Basement rocks and the Tarkwaian Sandstones along the northeast boundary of the Assafou deposit.

Assafou Exploration

The Assafou deposit was discovered in 2022 with the maiden Indicated resource of 14.9Mt at 2.33g/t containing 1.1Moz and an Inferred resource of 32.9Mt at 1.80g/t containing 1.9Moz defined on 31 October 2022, based on 56,000 metres of drilling.

Subsequently, an updated Indicated resource of 70.9Mt at 1.97g/t containing 4.5Moz and an Inferred resource of 2.9Mt at 1.91g/t containing 0.2Moz was defined on 14 November 2023, based on 123,000 metres of drilling.

In 2025, the mineral resource estimate was updated, with a Measured and Indicated resource of 84.8Mt at 1.91g/t for 5.2Moz and an Inferred resource of 1.9Mt at 1.95g/t containing 0.1Moz, based on 99,000 metres of drilling. This includes the maiden Mineral Resource estimate at Pala Trend 3.

Mineralisation at Assafou remains open along strike along the 20km long structural corridor extending from Koumenagaré in the northwest to Kongojdan in the southeast, as well as at depth where mineralisation has been identified below the current resource pit shell, and within the basement mafic Birimian volcanic rocks.

Figure 7 below highlights the additional drilling at the Assafou deposit that supports the increased reserve and resource size and confidence in the DFS. Infill and advanced grade control drilling on the Assafou deposit was completed during 2025 and reconfirmed the existing resource model, providing increased confidence in the initial phases of ore mining at the deposit. Resource definition drilling was completed at the Pala Trend 3 target located approximately 1 kilometre west of the Assafou deposit defining maiden resources.

Figure 7: Assafou Deposit Map

Figure 8 below highlights that 2025 drilling has identified mineralisation towards the southeast of the Assafou deposit, below the existing pit shell. Mineralisation starts at surface within the Tarkwaian Sandstones but extends into the Birimian Basement at depth, where it remains open, with further drilling planned for 2026.

Figure 8: Assafou Cross Section A0600

Figure 9 below highlights that 2025 drilling has identified high-grade mineralisation towards the southeast of the Assafou deposit, below the existing pit shell, at the basal contact of the Tarkwaian basin.

Figure 9: Assafou Cross Section A0833

Figure 10 below highlights several thick, stacked lenses of high-grade mineralisation within the central portion of the Assafou deposit, with mineralisation extending below the resource pit shell and in some cases into the Birimian basement rocks.

Figure 10: Assafou Cross Section A1716

Figure 11 below highlights thick continuous stacked lenses of deep-seated mineralisation in the centre of the Assafou deposit.

Figure 11: Assafou Cross Section A1766

Figure 12 below highlights that drilling within the centre of the Assafou deposit has improved the confidence in several high-grade stacked lenses of mineralisation throughout the deposit and confirmed the continuation of mineralisation along the contact between the Birimian and the Tarkwaian rocks at depth.

Figure 12: Assafou Cross Section A1850

Figure 13 below highlights that drilling within the centre of the Assafou deposit has identified several high-grade intercepts below and adjacent to the existing pit shell, with further drilling planned for 2026 to test the continuity of mineralisation at depth and towards the southwest within the sedimentary basin.

Figure 13: Assafou Cross Section A1866

Figure 14 below highlights that drilling in 2025 towards the northwest of the Assafou deposit has confirmed the continuity of several high-grade stacked lenses of mineralisation and identified continuous mineralisation towards the southwest of the Assafou deposit and up to 100 metres below the existing Assafou pit shell.

Figure 14: Assafou Cross Section A2316

Figure 15 below highlights that drilling towards the northwest of the Assafou deposit has confirmed several high-grade stacked lenses of mineralisation throughout the Assafou deposit. Mineralisation has also been identified up to 50 metres below the Assafou resource pit shell.

Figure 15: Assafou Cross Section A2416

Figure 16 below highlights that drilling towards the northwest of the Assafou deposit has identified significant mineralisation that extends below the existing Assafou pit shell.

Figure 16: Assafou Cross Section A2966

Regional Exploration

Endeavour’s 2026 – 2030 exploration strategy, published on 2 December 2025, outlines our conceptual resource discovery target for the Assafou project. Near-term targets include the Assafou, Pala Trend 3, Pala Trend 2 and Pala SW targets, which are all in close proximity, with similar mineralisation styles and metallurgy, to the existing Assafou resources.

For FY-2026 exploration at Assafou will advance with a $10 million guided spend focused on testing and progressing several potential satellite targets within 10 kilometres of the Assafou deposit, including the Pala Trend Southwest and Koumenagaré targets, in addition to resource definition at the Pala Trend 2 target.

Following an extensive soil geochemistry and geological mapping campaign, several new targets in close proximity to Assafou have been identified, with planned follow up in 2026. Figure 17 below, highlights some of the high-grade mineralised intercepts identified at these potential satellite targets.

Endeavour also entered a strategic partnership over the Assuéfry and the Koun-Fao permits, located immediately to the east and south of the Assafou permit, respectively, that host similar geology s to the Assafou deposit.

Figure 17: Iguela Regional Map

Figures 18, 19 and 20 below highlight the drilling completed at the Pala Trend 3 target in 2025. A 20,000 metre drill programme was completed confirming the presence of continuous lenses of mineralisation in both the Tarkwaian sediments and Birimian basement, close to the contact.

In 2026, a maiden Indicated resource at Pala Trend 3 of 4.7Mt at 1.55g/t for 0.2Moz and a maiden Inferred resource of 1.0Mt at 1.68g/t for 53koz was declared. Pala Trend 3 is located approximately 1 kilometre southwest of Assafou. Mineralisation is high-grade and starts from surface with the potential to supplement near-term production at the Assafou project.

Mineralisation remains open towards the northeast and depth, with further drilling at Pala Trend 3 and the other Pala targets planned for FY-2026.

Figure 18: Pala Trend 3 Cross Section P1166

Figure 19: Pala Trend 3 Cross Section P1266

Figure 20: Pala Trend 3 Cross Section P1366

At Pala Trend 2, a 3,331 metre drilling programme was completed during 2025 and defined a 3 kilometre long mineralised trend at the contact between Tarkwaian sediments and Birimian basement. Pala Trend 2 is located approximately 4 kilometres west of the Assafou deposit with continuous, high-grade mineralisation hosted in Birimian Basement rocks.

ASSAFOU TECHNICAL NOTES

All figures are expressed in United States dollars unless otherwise stated.

Assafou Geology

Mineralisation at Assafou is mainly hosted in Tarkwaian Sandstone, at/or immediately in the vicinity of the structural contact with Birimian Basement rocks (mainly mafic rocks). Gold mineralisation occurs both as disseminated occurrences within pervasively altered sandstone and within, or at the edges of, quartz (±carbonate) veins and breccias that crosscut the altered sandstones. Alteration is reflected by an induration (silicification) and by the presence of sulphides (pyrite), disseminated within the matrix and distributed along the sandstone bedding. The more intense the silicification (and presence of pyrite), the more mineralised the sandstones tend to be.

The structural contact likely controlled the initial sandstone deposition (normal fault in extensional regime). It was then reactivated under an SSW-NNE compressive regime at the brittle-ductile transition, associated with strong mylonitisation and alteration (quartz, carbonate, pyrite, ± sericite, ± chlorite) of the Birimian Basement rocks, and with mafic and felsic intrusions as dykes and sills. Gold mineralisation is likely to have occurred during this reversal, in the post-Tarkwaian reactivation event. Mineralising hydrothermal fluids are believed to have preferentially invaded the Tarkwaian Sandstones rather than the Birimian Basement rocks, due to their higher initial porosity, permeability and competency.

Assafou Resource Modelling

The statistical analysis, geological modelling and resource estimation were prepared by Endeavour’s resource team. The Qualified Person as defined by NI 43-101 responsible for the statistical analysis, geological modelling and mineral resource estimate is Kevin Harris, Vice President of Resources at the effective time for Endeavour. Mr. Harris has approved the disclosure relating to such technical information in this press release.

The Assafou mineral resource model was developed in Seequent’s Leapfrog Geo, Snowden’s Supervisor and Geovia’s Surpac software. The database used to generate the mineral resources comprised some 1,367 drill holes, totalling 278,454 metres. The drill hole data was supported by industry-standard quality assurance and quality control systems, with quality control sampling comprising blanks, coarse blanks, certified reference materials, and field and pulp duplicates. The QP has reviewed the QA/QC data available and considers the assay data to be suitable for use in the subsequent mineral resource estimate.

Mineralisation domains were modelled with the Vein System tool in Leapfrog Geo using the interval selection for each vein. The gold assays from the drill holes were composited to 1.0 metre intervals. Grade capping values were applied depending on the mineralised domain, between no cap and 40 g/t Au. Spatial analysis of the gold distribution within the mineralised zone indicated good continuity of the grades along strike and down dip within the mineralised zones. A geostatistical analysis (variography) of the composited gold assay grades was undertaken based on the representative estimation domains. During the variogram analysis, geological interpretation and modelling identified two distinct structural trends: northeast (NE) dipping trend and southwest (SW) dipping trend.

To properly capture spatial continuity within these orientations, the domains containing the highest number of samples were selected for detailed study. Domain 103 for the SW trend and Domain 238 for the NE trend. Variography has been applied using Snowden’s Supervisor for those domains and experimental variogram models were produced for these domains.

Density measurements from 10,224 samples covering each of the lithologies, were averaged based on the material type (and lithology, in the case of fresh material). Average density values were applied to the associated portions of the block model as outlined below:

Laterite 1.98 g/cm³
Saprolite: 1.91 g/cm³
Saprock: 2.38 g/cm³
Fresh: 2.77 g/cm³

Gold grades were estimated in Geovia’s Surpac using Inverse Distance Squared (‘IDW2’) and Ordinary Kriging (‘OK’). The grade was estimated in multiple passes to define the higher confidence areas and extend the grade to the interpreted mineralised zone extents.

The grade estimation was validated with visual and statistical analysis, and comparison with the drilling data on sections with swath plots comparing the block grades with the composites.

The majority of the resource is within the fresh rock, approximately 1.0% of the ounces is oxide, 11.0% is transition and 88.0% is fresh rock.

Endeavour considers that the quality and spatial distribution of the data used, the geological continuity of the mineralisation and the quality of the estimated block model for the Assafou deposit are sufficient for the reporting of Measured, Indicated and Inferred mineral resources, in accordance with the CIM Definition Standards (CIM, 2014). Measured mineral resources have typically been defined in in-fill drilling areas with a drill hole spacing of 20 – 25 metres along sections, Indicated mineral resources have typically been defined in areas with a drill hole spacing of 20 – 40 metres along sections, and (30 to 40 metres) between sections, where there is a reasonable level of confidence in geological and grade continuity. Inferred mineral resources have typically been defined in areas with a drillhole spacing of 50 – 75 metres, and where the controls on mineralisation are less well understood, or the continuity is reduced.

Mineral resources are reported within an optimised pit shell using a cut-off grade of 0.40 g/t Au and a gold price of $1,900/oz. Technical and economic assumptions were agreed for mining factors (mining and selling costs, mining recovery and dilution, pit slope angles) and processing factors (gold recovery, processing costs), which were used for optimisation. The optimised factors are summarised below:

Mining cost: $3.75/t ore and $2.72/t waste
Processing cost: Oxide/Transitional: $11.08/t ore; Fresh: $11.66/t ore
G&A cost: $4.68/t ore
Sustaining capital cost: $1.45/t ore
Other ore related costs (including grade control): $0.78/t ore
Selling cost: $71.50/oz Au
Mining recovery: 95.0%; Dilution 0.0%
Processing recovery: 95.7% for Oxide/transitional ore and 93.1% for fresh ore at the average grade
Average slope angles: 28-43°, dependent on geotechnical domain

Drilling, Assay, Quality Assurance and Quality Control Procedures

Reverse Circulation (“RC”) and Air Core (“AC”) drilling uses high pressure compressed air to deliver rock materials to the surface. The compressed air is delivered via a dual tube drill rod system, with an outer tube for air going down-hole, and an inner-tube for return going back to surface. In RC drilling, compressed air drives a percussion hammer. In both RC and AC drilling, compressed air carries rock particles back to surface via the inner tube, minimizing potential contamination affects.

The samples are collected from the cyclone at surface at 1 metre intervals. The cyclone is cleaned after every 6-metre rod by flushing the hole and physical opening of the cyclone and blowing out with compressed air at the end of each hole. Additional manual cleaning is required in saprolitic or wet ground, closely monitored by the site geologist / geo-technician to ensure no sample-to-sample contamination occurs. Samples are manually split at the drill site using two different riffle splitters, based on bulk sample weight. 2 to 5 kilograms laboratory samples and a second 2 to 5 kilograms reference sample are collected. Bulk and laboratory sample weights, in addition to moisture levels are recorded. Representative samples for each interval were collected with a spear, sieved into chip trays and retained for reference.

Diamond drilling collects drill core (PQ, HQ and NQ size) samples that are selected by Endeavour geologists and cut in half with a diamond blade at the project site. Half of the core is retained at the site for reference purposes. Sample intervals are generally 1 metre in length, adjusted with geologic and/or structural contacts. All samples are transported by road to Bureau Veritas in Abidjan. Each laboratory sample is secured in poly-woven bags ensuring that there is a clear record of the chain of custody. On arrival samples are weighed. Complete samples are crushed to 2 mm (70% passing) with 1 kilogram split out for pulverization. The entire 1 kilogram is pulverized to 75 μm (85% passing). A 50-gram sample is extracted and analysed for gold using standard fire assay technique. An Atomic Absorption (“AA”) finish provides the final gold value.

Blanks, field duplicates and certified reference material (“CRM’s”) are inserted into the sample sequence by Endeavour geologists at a rate of one of each per 20 samples. This ensures that there is a 5% Quality Assurance / Quality Control (“QA/QC”) sample insertion rate applied to each fire assay batch. The sampling and assaying are monitored through analysis of these QA/QC samples. This QA/QC program was audited by a consultant, independent from Endeavour Mining and has been verified to follow industry best practices.

In 2021 and 2022, 1,757 samples were sent to ALS Ouagadougou for umpire (referee) analysis. For 2023, 6,999 samples were sent for umpire testing at ALS Ouagadougou for preparation and analysis. When the original results for all umpire samples from BV are compared to ALS, for 2021 and 2022 the correlation coefficient is 95.9%. For 2023, the correlation coefficient is 87.7%. Correlation measures the relationship between the two values. The closer a value is to 100%, represents increased correlation. The absolute percent difference between the calculated means for the datasets is 3.15% for 2021 and 2022 and 2.7% for 2023. There is good correlation between the original results and those from the umpire laboratory. Core sampling and assay data were monitored through a quality assurance/quality control program designed to follow NI 43-101 and industry best practice.

Assafou Mineral Reserve Estimate

The Mineral Reserve Estimate (as at 31 December 2025) for the Project is supported by engineering designs and modifying factors in accordance with CIM Definition Standards. The Qualified Person as defined by NI 43-101 responsible for the Mineral Reserve estimate is Francois Taljaard, Pr. Eng, BEng (Hons) IND, SAIMM, MIMMM, of SRK Consulting (UK) Ltd. Mr Taljaard is a qualified person and independent for the purposes of National Instrument 43-101 and has reviewed and approved the disclosure relating to the Mineral Reserve Estimate in this press release.

The open pit is designed with three phases, an interim stage, a final phase, and a southern extension. The life-of-mine plan for the Project includes modification to the Resource model to generate the mining block through re-blocking, which introduces a degree of dilution, the pre-mining topographic surface and the Open Pit optimisation analysis. The same economic parameters were used to generate the pit shells for the Mineral Resource and the Mineral Reserve, with the exception of gold price and sales costs, which were $1900/oz and $1500/oz respectively.

A marginal gold cut-off grade of 0.40 g/t was used in the calculation of the open pit quantities for the production schedule and the mineral reserve estimate. The economic cut-off grade is calculated based on the processing cost parameters including cost of; grade control and run-of-mine re-handling; ore premium; processing the ore, plant/infrastructure maintenance, general and administration charges, and sustaining capital costs. Mineral reserve cut-off grades are 0.40 g/t Au for Laterite/, Saprolite/ and Saprock, and 0.50 g/t Au for Fresh rock.

The mineral reserve is reported from an engineered pit design, as a scheduled mining and processing estimate, that includes stockpiling. The scheduled mineral reserve is reported based on aggregating all Measured and Indicated mineral resource blocks incorporated within the life-of-mine plan, and reported inclusive of all appropriate dilution, diluted grade and losses; and all inferred material treated as waste.

QUALIFIED PERSONS

Lucette Hugo, VP Resource and Reserve of Endeavour Mining plc., a “Qualified Person” as defined by NI 43-101, has reviewed and approved the technical information other than in respect of the statistical analysis, geological modelling, and resource estimation and mineral reserve estimate in respect of Assafou disclosed in this release.

Endeavour has presented a comparison of the DFS to PFS for informational purposes and notes that the PFS should no longer be relied on as it is being replaced with the DFS.

CONTACT INFORMATION

Jack Garman
Vice President, Investor Relations
+44 203 011 2723
jack.garman@endeavourmining.com

Brunswick Group LLP in London
Carole Cable, Partner
+44 207 404 5959
ccable@brunswickgroup.com

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.

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 reasonable estimates, projections and assumptions at the date the statements are made, 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 international operations; risks related to general economic conditions and the impact of credit availability on the timing of cash flows and the values of assets and liabilities based on projected future cash flows; Endeavour’s financial results, cash flows and future prospects being consistent with Endeavour expectations in amounts sufficient to permit sustained dividend payments; the completion of studies on the timelines currently expected, and the results of those studies being consistent with Endeavour’s current expectations; actual results of current exploration activities; production and cost of sales forecasts for Endeavour meeting expectations; unanticipated 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 variations in ore reserves, grade or recovery rates; failure of plant, equipment or processes to operate as anticipated; extreme weather events, natural disasters, supply disruptions, power disruptions, accidents, pit wall slides, labour disputes, title disputes, claims and limitations on insurance coverage and other risks of the mining industry; delays in the completion of development or construction activities; changes in national and local government legislation, regulation of mining operations, tax rules and regulations and changes in the administration of laws, policies and practices in the jurisdictions in which Endeavour operates; disputes, litigation, regulatory proceedings and audits; adverse political and economic developments in countries in which Endeavour operates, including but not limited to acts of war, terrorism, sabotage, civil disturbances, non-renewal of key licences by government authorities, or the expropriation or nationalisation of any of Endeavour’s property; risks associated with illegal and artisanal mining; environmental hazards; climate-related physical and transition risks; the availability and performance of emissions-reduction and renewable energy technologies; changes in climate-related disclosure requirements or ESG-related regulation; evolving stakeholder expectations; the reliability and accuracy of ESG-related data (including greenhouse gas emissions estimates, particularly Scope 3 emissions); reliance on third-party information, contractors and suppliers for ESG metrics; and the Company’s ability to achieve ESG-related targets or ambitions; and risks associated with new diseases, epidemics and pandemics.

ESG-related disclosures are inherently subject to measurement uncertainties and methodological limitations. Certain ESG metrics, including greenhouse gas emissions, climate scenario analysis, biodiversity impacts and supply chain data, are based on evolving standards, estimates, assumptions and third-party information, and may not have the same degree of accuracy, comparability or assurance as financial information prepared in accordance with IFRS. As ESG reporting frameworks and regulatory requirements in the United Kingdom and Canada continue to develop, the Company may revise or update its methodologies, baselines or disclosures in future reporting periods.

Although Endeavour 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.sedarplus.ca for further information respecting the risks affecting Endeavour and its business.

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