Séguéla gold mine revamp: design, throughput and risk notes for mine planners
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Fortuna Mining is investing about US$109 million to expand its Séguéla gold mine in Côte d’Ivoire, lifting plant throughput 30% from 1.75 Mt/y to 2.3 Mt/y and targeting 94.5% gold recovery and 200,000 oz/y output for at least 10 years. The revamp adds a new ball mill circuit, extra gravity concentration, a second carbon‑in‑leach train, and upgraded reagent, oxygen, water and tailings infrastructure, with staged delivery from 2026 to full capacity by late 2028. Underground development at the Sunbird deposit from 2027 will provide additional feed to the expanded plant.
Technical Brief
- Payback period for the US$109‑million expansion is projected at 2.5 years from start‑up.
- Comminution upgrade centres on adding a dedicated ball mill circuit to handle higher tonnage.
- New gravity concentration equipment is being installed ahead of leach to capture coarse free gold.
- A second carbon‑in‑leach train is being built to increase residence time and adsorption capacity.
- Reagent storage and dosing systems are being upsized to match the 30% throughput increase.
- Oxygen supply infrastructure is being expanded to maintain dissolved oxygen levels at higher leach rates.
- Water and tailings handling systems are being reinforced to manage increased slurry volumes and deposition rates.
- Workforce scale is material, with more than 1,800 employees and contractors on site as of 2025.
- Sequenced delivery from early works in 2026 to late‑2028 full capacity reduces construction–operations interference.
Our Take
Tether’s purchase of 14 tonnes of gold for USDT reserves, mentioned alongside Séguéla, underlines how non‑traditional financial buyers are becoming a material demand segment in the gold market covered in our 414 gold‑tagged pieces, which can support price assumptions underpinning long‑life assets in Woroba District and eastern Senegal.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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