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    Metso Tonkolili 30 Mt/y concentrator: design and power notes for mine engineers

    December 22, 2025|

    Reviewed by Joe Ashwell

    Metso Tonkolili 30 Mt/y concentrator: design and power notes for mine engineers

    First reported on International Mining – News

    30 Second Briefing

    Metso has secured an order from Leone Rock Metal Group to supply minerals processing equipment for the Phase III 30 Mt/y magnetite concentrator at the Tonkolili iron ore project in Sierra Leone. The package covers engineering, manufacturing, supply, installation and commissioning support for the new concentrator line, booked in Metso’s Minerals segment 2025 Q4 orders. The scale of the 30 Mt/y phase signals substantial additional crushing, grinding and magnetic separation capacity, with implications for tailings handling, water balance and power demand on an already large West African iron ore operation.

    Technical Brief

    • Contract scope explicitly bundles engineering, manufacturing, supply, installation and commissioning support into a single package.
    • Order is recorded in Metso’s Minerals segment order book for the fourth quarter of 2025.
    • Leone Rock Metal Group is the client of record for the Tonkolili Phase III concentrator package.
    • Equipment suite is dedicated to magnetite processing, implying wet grinding and magnetic separation flowsheets rather than DSO.
    • Integrated delivery model should simplify interface risk between OEM design, on-site erection and cold/hot commissioning.
    • Booking in 2025 suggests detailed engineering and fabrication will run ahead of on-site construction mobilisation.
    • OEM-led commissioning support typically accelerates ramp-up curves and de-risks early throughput penalties.
    • Similar large-scale concentrator packages in West Africa often drive parallel upgrades to power, water and tailings systems.

    Our Take

    Within the 54 keyword-matched iron ore and magnetite pieces in our database, very few are in West Africa, so Tonkolili’s 30 Mt Phase III build-out in Sierra Leone stands out against a cluster of Australian and Brazilian magnetite concentrator stories.

    A 30 Mt/y magnetite concentrator typically implies high power demand and complex water management, which in Sierra Leone’s grid context is likely to push Leone Rock Metal Group towards on-site power solutions and careful tailings/water-circuit design to keep operating risk under control.

    Among the 842 tag-matched Projects and Contract Award items, Metso frequently appears on large-scale iron ore concentrator packages, signalling that LRMG is aligning Tonkolili’s flowsheet with equipment and process designs already proven at other high-throughput magnetite operations.

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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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