Geomechanics.io

  • Free Tools
Sign UpLog In
Built byBoxcut Studio

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

    Pebble mine DOJ-backed veto: permitting and project risk takeaways for engineers

    February 19, 2026|

    Reviewed by Joe Ashwell

    Pebble mine DOJ-backed veto: permitting and project risk takeaways for engineers

    First reported on MINING.com

    30 Second Briefing

    Northern Dynasty Minerals’ shares fell up to 45% to C$1.52 after the US Department of Justice filed a brief in Alaska backing the EPA’s Clean Water Act veto on the Pebble copper-gold-molybdenum project. The EPA move, which blocks storage of mine waste that it says would destroy more than 2,000 acres of wetlands in the Bristol Bay sockeye salmon watershed, effectively halts what was slated to be North America’s largest copper, gold and molybdenum mine. A 2023 study projected 6.4 billion lb copper and 7.4 million oz gold output over 20 years, now in limbo pending summary judgment.

    Technical Brief

    • EPA’s Clean Water Act action targets mine waste storage by Pebble’s Alaskan subsidiary, not extraction itself.
    • Proposed Pebble site lies 320 km southwest of Anchorage within the Bristol Bay watershed boundary.
    • EPA’s impact rationale includes loss of over 2,000 acres of wetlands supporting sockeye salmon fisheries.
    • Resource inventory includes 37 million oz silver and 200,000 kg rhenium in addition to Cu-Au-Mo.
    • Northern Dynasty has pursued Pebble development for over 20 years under prolonged federal and local scrutiny.
    • Dispute is being handled via summary judgment, avoiding a full evidentiary trial on technical mine impacts.
    • Plaintiffs in the case comprise Northern Dynasty, the state of Alaska and two unnamed local groups.
    • DOJ brief deadline was 17 February 2026, with final reply briefs from plaintiffs to follow.
    • Share price reaction cut Northern Dynasty’s market capitalisation to about C$1 billion by midday trading.

    Our Take

    Pebble’s projected 6.4 billion lb copper output over 20 years would place it at the very top end of North American copper projects in our database, so a sustained EPA veto effectively tightens the long-term supply outlook relative to other US-facing projects like Trilogy Metals’ Ambler assets.

    The sharp C$1 billion–scale market capitalisation swing for Northern Dynasty contrasts with the more policy-supportive stance seen in Ontario’s fast-tracking of Kinross Gold’s Great Bear project, underscoring how US federal permitting risk in Alaska is being priced very differently from Canadian gold–copper jurisdictions.

    With restart costs for the Rubaya mine estimated at US$50–150 million, the capital at risk there is modest compared with the stranded value implied by Pebble’s multi-metal resource, suggesting investors may increasingly focus on smaller, lower-permitting-risk assets rather than betting on a reversal of the Bristol Bay watershed protections.

    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

    Fortescue copper–arsenic Toowong Process: project economics lens for mine planners
    Mining
    about 7 hours ago

    Fortescue copper–arsenic Toowong Process: project economics lens for mine planners

    Fortescue has sold more than 40 tonnes of copper concentrate treated with its patented Toowong Process, a low-temperature, low-pressure hydrometallurgical circuit that removes arsenic from copper concentrates. Developed and tested over four years after Fortescue acquired the technology, the process targets a longstanding penalty element constraint that limits saleability of high-arsenic ores. Commercial deployment could materially change project economics for arsenic-rich copper deposits, enabling miners to convert previously marginal or stranded resources into exportable concentrate streams.

    Core’s Finniss lithium: 92 m Blackbeard hit and what it means for mine design
    Mining
    about 7 hours ago

    Core’s Finniss lithium: 92 m Blackbeard hit and what it means for mine design

    Core Lithium has reported its longest mineralised downhole intersection at the Blackbeard prospect within the Finniss lithium operation in the Northern Territory, with diamond drillhole NMRD104 returning 92m at 1.25 per cent Li₂O, including 73m at 1.45 per cent Li₂O. The thick, continuous spodumene-bearing pegmatite materially extends known mineralisation at depth and along strike, improving the potential for larger, more coherent underground or bulk open-pit mine designs. For resource modellers and geotechs, the interval supports tighter geological domaining and may justify updated pit shells and geotechnical slope assessments.

    South32 Australian manganese output lift: throughput takeaways for mine planners
    Mining
    about 7 hours ago

    South32 Australian manganese output lift: throughput takeaways for mine planners

    South32 lifted Australia Manganese saleable output 15 per cent quarter-on-quarter to 902,000 wet metric tonnes in the September 2026 quarter, driven by higher utilisation of the primary processing circuit, while keeping full-year production guidance unchanged across its operations. Alumina production also increased, and the company is continuing capital deployment into base metals growth projects, including copper and zinc developments. For mine planners and process engineers, the numbers signal more stable plant throughput assumptions and sustained demand for processing circuit optimisation and debottlenecking work.

    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