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    CIMIC–Hindustan Zinc tailings recycling project: design notes for mine engineers

    January 23, 2026|

    Reviewed by Tom Sullivan

    CIMIC–Hindustan Zinc tailings recycling project: design notes for mine engineers

    First reported on International Mining – News

    30 Second Briefing

    CIMIC Group subsidiaries Sedgman and Leighton Asia have secured separate contracts from Hindustan Zinc Limited to help deliver India’s first zinc tailings recycling facility at the Rampura Agucha Mine in Rajasthan. Sedgman will focus on process plant and tailings treatment infrastructure, while Leighton Asia will provide project delivery and construction services for the brownfield site. The project signals large-scale reprocessing of legacy zinc tailings at one of the world’s largest zinc operations, with implications for paste backfill design, tailings storage stability and metal recovery circuits.

    Technical Brief

    • Tailings recycling is expected to alter tailings rheology, influencing paste backfill mix design and pumpability envelopes.
    • Reprocessed tailings could enable partial in-pit or underground backfilling, reducing long-term surface storage volumes.
    • Similar large-scale tailings reprocessing at polymetallic mines has typically required extensive geotechnical recharacterisation of legacy deposits.

    Our Take

    Hindustan Zinc Limited showing up as the world’s largest integrated zinc producer and a top-five silver producer in our database means tailings recycling at Rampura Agucha Mines is likely to have a non-trivial impact on global secondary zinc and silver supply, not just on local waste management.

    Among the 727 Mining stories and 1403 tag-matched pieces in our coverage, relatively few combine ‘Projects’, ‘Sustainability’ and a top-ranked global producer, so this contract for CIMIC Group subsidiaries positions Sedgman and Leighton Asia as reference contractors for large-scale tailings reprocessing work in India.

    Given Rajasthan’s role in India’s base metals output, a high-profile tailings recycling project at Rampura Agucha Mines signals to other Indian operators that upgrading legacy tailings facilities can now be framed as both a production and ESG play, which may influence how future zinc and silver projects are scoped and tendered in the region.

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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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