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    Allied Gold’s Sadiola expansion: throughput and circuit design notes for mine planners

    December 22, 2025|

    Reviewed by Joe Ashwell

    Allied Gold’s Sadiola expansion: throughput and circuit design notes for mine planners

    First reported on MINING.com

    30 Second Briefing

    Allied Gold has started Phase 1 expansion at the Sadiola mine in Mali, bringing a new fresh ore comminution circuit online to lift annual output to 200,000–230,000 oz, up 17–30% on 2023. The upgrade increases higher-grade fresh ore in mill feed from about 20% to as much as 60% at an expected throughput of 5.7 Mt/y, with the first full quarter of higher fresh-ore volumes due in Q1 2026. Engineering is advancing for a 2026 pre-leach thickener and plant-wide control system upgrade, underpinning a Phase 2 build-out through 2029 and supporting group guidance above 375,000 oz in 2025.

    Technical Brief

    • Phase 1 fresh-ore comminution circuit is now operational at Sadiola, processing ore through a new line.
    • Allied targets about 60,000 oz from Sadiola in Q4 2025, ~40% above earlier 2025 quarterly averages.
    • Company-wide Q4 2025 production is forecast above 113,000 oz, a 13% year-on-year increase.
    • Pre-leach thickener installation is scheduled for 2026, adding fresh and transitional ore processing capacity.
    • A plant-wide control system upgrade is being engineered to tighten process control and reduce operating costs.
    • Phase 2 expansion is planned to start late 2026 and extend through to 2029 at Sadiola.
    • Output growth also depends on strong contributions from Côte d’Ivoire operations, particularly the Bonikro mine.
    • Allied maintains 2025 guidance above 375,000 oz, signalling confidence in ramp-up and integration of both phases.

    Our Take

    Shifting the Sadiola mill feed from about 20% to 60% fresh ore while lifting throughput to 5.7 Mt/y signals a move towards a higher-grade, harder-ore regime where comminution power and liner wear management will become more critical for Allied Gold’s operating costs.

    The projected 17–30% production uplift versus 2023, with a 40% step-up in Q4 2025 and 13% year-on-year company-wide growth, suggests Allied Gold is positioning Sadiola and Bonikro to compete with mid-tier African gold producers that our database shows are also chasing multi-year, staged debottlenecking rather than single-step expansions.

    With Phase 2 at Sadiola running through to 2029 in Mali and Bonikro in Côte d’Ivoire, Allied Gold is concentrating growth in West Africa, a region that in our recent gold coverage has combined relatively supportive mining codes with elevated security and political risk that can affect scheduling and contractor availability.

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    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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