Endeavour Mining Results Presentation Deck

SABODALA-MASSAWA PROJECT KEY CHANGES DFS VS. PFS AREA Geometallurgical Processing Tailings Infrastructure Construction management BIOX® EXPANSION DESCRIPTION OF CHANGE Additional geometallurgical work has reclassified fresh and transitional ore from the Massawa Central Zone and Massawa North Zone as more amenable to processing through the refractory plant adding an additional 3.8Mt at 2.02g/t gold for 248koz into the refractory ore reserves Addition of a standalone ROM pad and crusher Addition of a surge bin Addition of a gravity circuit within the milling circuit Addition of a flotation cleaner circuit Reduced the number of BIOX® reactors from nine to seven following further metallurgical tests which showed lower sulphur content for the Massawa Central Zone and North Zone deposits Addition of a separate high-density polyethylene ("HDPE") fully lined tailings storage facility ("TSF 1B") into the initial scope which will host the neutralised product and the BIOX® CIL tailings while the existing tailings storage facility ("TSF 1") will host the flotation tailings 18MW expansion of the existing HFO power plant, adding three 6MW HFO generators and two back up diesel generators, with the option to add-in solar to the infrastructure in the future Additional infrastructure including roads, water and administrative buildings Endeavour managed EPCM compared to contracted 3rd-party ENDEAVOUR MINING EXPECTED RESULT Removes risk associated with blending transitional and fresh ore with oxide ore into the CIL circuit. Improves mining efficiency due to lower need for selective mining. Improves overall recoveries and provides supplemental ore feed into the BIOX® plant. Reduces the risk of cross-contamination and improves blending optionality Improves capacity when processing softer ore and provides a supplemental feed to cover crusher outages Improves recoveries from the high-grade ores containing free-milling gold Controls the sulphur and carbonate grades in the concentrate and manages acid consumption in the BIOX® circuit Reduced BIOX® reactors and reduced associated blower air and cooling requirements reduced the upfront cost of the BIOX® circuit component Allows the clean supernatant water from TSF 1 to be recirculated into either processing plant without treatment De-risks power supply by increasing the capacity of the existing power plant by 50% to ensure sufficient power supply and back-up supply to maintain stable conditions for the BIOX® reactors Improves access and infrastructure at the Massawa Central Zone and Massawa North Zone pits Allows for flexibility in defining scope, contractor selection and procurement ensuring that the projects' team leverages off the existing operation 46

View entire presentation