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    Core Lithium’s Finniss milestones: pit design and scheduling notes for planners

    July 15, 2026|

    Reviewed by Tom Sullivan

    Core Lithium’s Finniss milestones: pit design and scheduling notes for planners

    First reported on Australian Mining

    30 Second Briefing

    Core Lithium has begun mining at the Grants open pit within the Finniss Lithium Operation in the Northern Territory, with the pit expected to deliver about 784,000 tonnes of lithium ore. The company remains on schedule for its first shipment of newly produced SC5 spodumene concentrate in the second quarter of 2026, signalling a move from development into early production. For geotechnical and mine planners, the ramp-up at Grants sets the reference geometry, pit wall performance and ore scheduling parameters for subsequent Finniss pits.

    Technical Brief

    • Operational data from Grants’ early benches will calibrate pit wall design and slope performance assumptions for Finniss.
    • Start of mining at Grants establishes in-situ ore performance for scheduling and stockpile management across the operation.
    • Early open pit performance at Grants will inform drill‑and‑blast patterns and fragmentation targets for subsequent pits.

    Our Take

    Recent coverage of Core Lithium’s Finniss assets shows a rapid sequence: May 2026 blasting restart at Grants open pit, June 2026 portal cutting at BP33 underground, and now this Q2 2026 activities report, signalling a deliberate push to re-establish continuous ore feed in the Northern Territory after prior curtailments.

    The second offtake for lithium fines with Glencore, reported in June 2026, suggests Finniss can monetise lower-spec material alongside spodumene concentrate, which may help smooth cashflow through commissioning and ramp-up phases at the Grants open pit and any subsequent underground sources.

    Within our 119 lithium- and spodumene concentrate–tagged pieces, Finniss stands out as one of the few Northern Territory hard-rock operations progressing both open pit and underground workstreams in parallel, which could give Core Lithium optionality on mine scheduling and cut-off grades if market conditions shift again before or after 2026.

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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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