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    LXML’s Discovery Deeps 2 at Sepon: design and operations lens for mine engineers

    August 1, 2026|

    Reviewed by Tom Sullivan

    LXML’s Discovery Deeps 2 at Sepon: design and operations lens for mine engineers

    First reported on International Mining – News

    30 Second Briefing

    Lane Xang Minerals Limited Company has opened the Discovery Deeps 2 (DD2) underground operation at the Sepon gold-copper mine in Lao PDR, advancing its shift from open pit to modern underground mining. DD2 follows earlier underground developments at Sepon and is expected to build on the mine’s 2025 copper output of around 7,000 t, with ore sourced from deeper sulphide zones. The expansion signals longer mine life, more complex ground control and ventilation requirements, and increased demand for skilled underground operators and contractors in the region.

    Technical Brief

    • Lane Xang Minerals Limited Company (LXML) is the project owner and operator of DD2.
    • The DD2 opening was marked by an official grand opening ceremony, signalling operational readiness.
    • DD2 targets deeper ore below existing operations, requiring new underground access and services infrastructure.
    • Transition to underground at Sepon implies increased reliance on specialised contractors for development and production drilling.
    • Additional underground stoping at DD2 will necessitate upgraded mine services, including power distribution and dewatering capacity.
    • For similar mature open pits in Southeast Asia, such underground “deeps” projects are increasingly used to access remnant resources.

    Our Take

    Within our 1291 Mining stories, very few Lao PDR assets feature, so the Discovery Deeps 2 underground start-up at the Sepon Gold-Copper Mine signals that this jurisdiction is moving from legacy open pits towards more technically complex underground operations.

    Gold-copper combinations dominate the 590 keyword-matched pieces in our database, and operators with established processing streams for both metals, like LXML at Sepon, typically gain more optionality in mine planning and cut-off grade strategy when metal price cycles diverge.

    With copper production flagged for 2025, DD2 effectively extends the life of the Sepon Gold-Copper Mine, which in similar projects in our coverage often underpins decisions to upgrade underground infrastructure (ventilation, backfill, power) rather than treat the new zone as a short-life satellite.

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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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