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
    Sustainability

    OceanaGold Waihi expansion: design, throughput and tailings notes for engineers

    September 25, 2026|

    Reviewed by Joe Ashwell

    OceanaGold Waihi expansion: design, throughput and tailings notes for engineers

    First reported on MINING.com

    30 Second Briefing

    OceanaGold is weighing a 50% expansion of its Waihi plant to 1.2 Mt/y after Wharekirauponga drilling returned standout intercepts including 6.3 m at 97.2 g/t Au from 481.5 m in the East Graben vein and 8.5 m at 41.5 g/t from 399 m. The move would enable concurrent feed from Martha Underground and Wharekirauponga post‑2032, building on a 2024 plan outlining 1.6 Moz over 15 years and an initial 4.1 Mt reserve at 9.2 g/t. Underground development is advancing, with the Waihi North decline now 350 m, first vent shaft under construction, staged commissioning of a new water treatment plant, and early works on a new tailings storage facility due in Q4.

    Technical Brief

    • Standout WKP146C hit: 6.3 m @ 97.2 g/t Au from 481.5 m in East Graben vein.
    • Additional WKP146C interval: 6.6 m @ 24 g/t from 403.4 m, including 1.2 m @ 107.7 g/t.
    • WKP150 returned 8.5 m @ 41.5 g/t from 399 m; WKP146A cut 9.6 m @ 18.5 g/t from 401 m.
    • Five drill rigs now operating at Wharekirauponga, up from three in April, accelerating resource conversion drilling.
    • December 2025 resource: 2.63 Mt M&I @ 17.3 g/t (1.46 Moz) plus 2.9 Mt inferred @ 8.5 g/t (0.8 Moz).
    • Waihi North decline, started May, has advanced ~350 m; first ventilation shaft construction underway.
    • About 6.5 km of underground development is planned to connect Waihi North decline to Wharekirauponga, ~10 km north.
    • Water treatment plant is in staged commissioning; early works for a new tailings storage facility scheduled Q4, with Willows portal surface facilities due by year-end.

    Our Take

    With Waihi plant throughput planned at 1.2 Mt/y and Didipio in the Philippines already moving from 1.7 Mt/y to 2.5 Mt/y underground, our coverage suggests OceanaGold is systematically scaling processing and underground capacity across its portfolio rather than relying on a single flagship mine.

    Earlier work on mine fleet electrification at Waihi North in OceanaGold’s 2025 Sustainability Report means the 6.5 km of underground development to Wharekirauponga is likely to be an early test bed for lower-emission haulage and ventilation strategies compared with legacy operations such as Martha Underground.

    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

    Gold price slides on strong dollar: planning implications for mine projects
    Mining
    about 2 hours ago

    Gold price slides on strong dollar: planning implications for mine projects

    Gold prices slipped to a one-week low as spot gold fell 0.4% to $4,271.16/oz in New York and December futures eased 0.3% to $4,306 amid a stronger US dollar and expectations of more hawkish US Federal Reserve rate moves. The dollar hit a two-month high and US 10-year Treasury yields hovered near a 20-year peak, sharply raising the opportunity cost of holding non-yielding bullion. Oil gained about 1% on stalled US–Iran talks over the war, while spot silver dropped 1.8% to $63.29/oz, platinum 0.2% to $1,746.44, and palladium rose 0.5% to $1,266.40.

    Kinross Gold output cut and higher AISC: operational drivers and FCF lens for mine teams
    Mining
    about 2 hours ago

    Kinross Gold output cut and higher AISC: operational drivers and FCF lens for mine teams

    Kinross Gold has cut its 2026–27 production outlook by about 8% to 1.84–1.86 million attributable gold-equivalent oz. a year and raised 2024 AISC guidance to $1,850–$1,900/oz after winter storms, copper-rich sulphide ore and poor recoveries at La Coipa in Chile, plus weaker mining rates, grades and recoveries at Round Mountain Phase S in Nevada. The company is stockpiling high-copper material, studying a new flotation circuit for deeper sulphide mineralisation that may overlie a copper porphyry system, and using a smaller shovel at Round Mountain to cut dilution. Despite the operational hit and a Q3 output cut to about 425,000 oz., Kinross has lifted its 2026 shareholder return target to 50% of free cash flow and has already returned about $800 million this year, mainly via $655 million in buybacks.

    Rainbow–Neo Phalaborwa offtake: project economics and flowsheet notes for engineers
    Mining
    about 2 hours ago

    Rainbow–Neo Phalaborwa offtake: project economics and flowsheet notes for engineers

    Rainbow Rare Earths has secured an offtake and processing memorandum with Neo Performance Materials covering 40% of Phalaborwa’s separated NdPr oxide and 65% of its mixed SEG+ heavy rare earth carbonate, enabling a prefeasibility study in Q4 and pushing the definitive feasibility study to the first half of 2027. Neo will supply solvent extraction design and technical support, with test work on phosphogypsum-derived feed under way in Estonia and an integrated pilot planned in Johannesburg, de-risking the complex separation of dysprosium, terbium and yttrium. The $326 million project would recover magnet rare earths from legacy fertiliser gypsum stacks, potentially feeding Neo’s Estonian separation and sintered magnet plant and offering a non-Chinese supply route linked to European capacity.

    Related Industries & Products

    Mining

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

    Construction

    Quality control software for construction companies with material testing, batch tracking, and compliance 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