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    Boroo’s bid for Eagle gold mine: failure legacy and risk notes for engineers

    June 3, 2026|

    Reviewed by Tom Sullivan

    Boroo’s bid for Eagle gold mine: failure legacy and risk notes for engineers

    First reported on MINING.com

    30 Second Briefing

    Boroo has entered a 90‑day exclusivity agreement with PwC to conduct due diligence on acquiring the landslide‑damaged Eagle gold mine in Yukon, where a June 2024 heap leach pad failure released millions of tonnes of ore and at least 280,000 m³ of cyanide-bearing solution. PwC previously valued Eagle’s assets at nearly C$825 million against about C$458 million in accident-related liabilities, while a 2023 mine plan outlined 124 million tonnes at 0.65 g/t Au (2.58 Moz contained) over a 12‑year life. Boroo brings heap leach experience from Lagunas Norte and Mongolian operations, backed by US$300 million in senior secured notes, but must still secure Yukon government and Na‑Cho Nyäk Dun approvals.

    Technical Brief

    • Independent Review Board attributed the heap leach failure to inadequate surveillance, poor drainage and excessive load/pressure.
    • Accident-related liabilities total about C$458 million, with PwC warning ultimate heap failure costs remain uncertain.
    • Failure investigation relied on an Independent Review Board process, combining operational review with geotechnical and drainage assessment.
    • Ongoing remediation includes operating the ADR plant in a closed-loop circuit to recover residual gold without new leaching.
    • Monitoring going forward will need to address drainage performance, pad loading and real-time surveillance to prevent renewed instability.

    Our Take

    Within our 1183 Mining stories, only a subset of gold pieces combine low reserve grades like Eagle’s 0.65 g/t with such a high post-tax IRR (55%), which suggests that any restart case will be extremely sensitive to assumptions about remediation scope and heap leach pad stability after the 40 million tonnes landslide event.

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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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