Geomechanics.io

  • Free Tools
Sign UpLog In

Geomechanics.io

Geomechanics, Streamlined.

© 2026 Geomechanics.io. All rights reserved.

Geomechanics.io

CMRR-ioGEODB-ioHYDROGEO-ioQCDB-ioFree Tools & CalculatorsBlogLatest Industry News

Industries

MiningConstructionTunnelling

Company

Terms of UsePrivacy PolicyLinkedIn
    Projects
    Failure
    Safety

    Donlin mine tailings spill scenario: design and risk lessons for engineers

    September 28, 2026|

    Reviewed by Tom Sullivan

    Donlin mine tailings spill scenario: design and risk lessons for engineers

    First reported on MINING.com

    30 Second Briefing

    A new draft supplemental environmental impact statement from the US Army Corps of Engineers and BLM models a 27% tailings storage facility failure at NOVAGOLD’s proposed Donlin Gold mine in Alaska, warning a toxic wave could reach Crooked Creek village in 90 minutes, bury it in tailings and leave metal contamination in the Kuskokwim River basin for more than a century. The scenario, far larger than the previously assessed 0.5% spill, projects long-term erosion, groundwater mounding, altered stream channels and persistent reductions in fish abundance, with NGOs demanding analysis of a full dam failure. The 40-million-ounce, 2.22 g/t deposit is permitted for 1.1 million ounces per year over 27 years, but the SEIS outcome could modify, reaffirm or rescind the existing federal permit.

    Technical Brief

    • Draft SEIS models a partial TSF failure releasing approximately 27% of stored tailings volume.
    • Failure scenario assumes a fast-moving tailings slurry “toxic wave” capable of human fatalities on impact.
    • Hydrological modelling predicts inundation of thousands of acres, groundwater mounding and long-term alteration of stream channel morphology.
    • Metal contaminants are projected to persist in soils and sediments for over 100 years, with wetlands potentially converting to uplands.
    • Aquatic and riparian fauna, especially small-bodied species, face multi-decade habitat loss and generational population effects.
    • Failure analysis remains limited to partial TSF breach; tribal and NGO stakeholders request explicit full-dam failure modelling.
    • Monitoring and remediation concepts in the SEIS focus on dilution in the Kuskokwim River and long-duration cleanup to reduce impact magnitude.
    • Safety commentary stresses that tailings dam failures are low-probability, high-consequence events requiring quantified flood depth and arrival-time predictions for effective evacuation planning.

    Our Take

    With Donlin Gold projected at 1.1–1.3 Moz/y over a 27‑year mine life, any tailings dam design in Alaska will be scrutinised as a long‑duration, high-consequence facility, especially in a Hazards context where our database shows relatively few gold projects of this production scale facing such explicit failure-modelling in public comment processes.

    The US Army Corps of Engineers’ role here mirrors its involvement in Trilogy Metals’ Arctic project in Alaska, suggesting that Corps decisions on Donlin’s tailings and water management could inform expectations and precedent for other large-scale gold and base metals projects in the state.

    Barrick Gold’s presence at Donlin alongside its other large gold assets flagged in our coverage (such as Nevada Gold Mines and Pueblo Viejo) means that any perceived tailings risk in Alaska could influence how investors benchmark Barrick’s group-wide ESG and dam safety profile against other major gold producers.

    Geotechnical Software for Modern Teams

    Centralise site data, logs, and lab results with GEODB-io, CMRR-io, and HYDROGEO-io.

    No credit card required.

    • Save and export unlimited calculations
    • Advanced data visualisation
    • Generate professional PDF reports
    • Cloud storage for all your projects

    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.

    Related Articles

    Acorn adds commercial manager: implications for asbestos project delivery and safety
    Hazards
    25 days ago

    Acorn adds commercial manager: implications for asbestos project delivery and safety

    Asbestos management consultancy Acorn Analytical Services has appointed Ben James as commercial manager to lead its sales team and secure larger, more complex consultancy and removal projects. James, a former apprentice carpenter and joiner, moved into asbestos work in his early twenties after his grandfather died from asbestosis and has since progressed from trainee asbestos surveyor to contract manager over nine years. He will oversee new technical enquiries, key account management and site visits, and is qualified to deliver asbestos awareness, non-licensed removal and duty-to-manage training under a Level 3 teaching qualification.

    Coalsnaughton mine subsidence demolitions: geotechnical lessons for engineers
    Hazards
    26 days ago

    Coalsnaughton mine subsidence demolitions: geotechnical lessons for engineers

    Homes on Benbuck View and Dunmoss View in Coalsnaughton, Clackmannanshire are to be demolished after Mining Remediation Authority investigations confirmed historic underground workings had caused active mine subsidence beneath the two streets. The decision follows visible ground movement reported on 18 May and subsequent detailed geotechnical assessments that ruled out practical stabilisation options for the affected plots. Engineers will now need to manage demolition, backfilling and long-term ground monitoring, with implications for foundations and service corridors on adjacent properties built over former coal measures.

    LondonEnergy Wembley Waste Transfer Station fire: structural and fire design lessons
    Hazards
    about 1 month ago

    LondonEnergy Wembley Waste Transfer Station fire: structural and fire design lessons

    A major fire at LondonEnergy’s Wembley Waste Transfer Station on Hannah Close, Neasden, has required 20 fire engines and about 125 firefighters to bring the blaze under control. The incident at the enclosed waste-handling facility raises immediate concerns over structural integrity of steel frames, cladding performance under high thermal loads, and potential damage to concrete slabs from prolonged heating and quenching. Engineers will need rapid assessment of fire spread pathways through waste stockpiles and building services to inform repairs, resilience upgrades and future fire-separation design.

    Related Industries & Products

    Mining

    Geotechnical software solutions for mining operations including CMRR analysis, hydrogeological testing, and data management.

    CMRR-io

    Streamline coal mine roof stability assessments with our cloud-based CMRR software featuring automated calculations, multi-scenario analysis, and collaborative workflows.

    HYDROGEO-io

    Comprehensive hydrogeological testing platform for managing, analysing, and reporting on packer tests, lugeon values, and hydraulic conductivity assessments.

    GEODB-io

    Centralised geotechnical data management solution for storing, accessing, and analysing all your site investigation and material testing data.

    AllGeotechnicalInfrastructureHazardsEnvironmental