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
    Contract Award

    Fortuna’s US$1B Diamba Sud gold project: capex, returns and schedule for mine planners

    July 1, 2026|

    Reviewed by Joe Ashwell

    Fortuna’s US$1B Diamba Sud gold project: capex, returns and schedule for mine planners

    First reported on MINING.com

    30 Second Briefing

    Fortuna Mining’s Diamba Sud open pit gold project in eastern Senegal now carries a post-tax NPV (5%) of US$1 billion, a 9.4‑year mine life and probable reserves of 20.5 Mt at 1.75 g/t for 1.1 Moz, based on a US$3,500/oz gold price. The feasibility study lifts total forecast production 25% to 1 Moz but raises initial capex 40% to US$398 million and all‑in sustaining costs to US$1,332/oz, cutting IRR to 60%. Early works, including an access road and camp expansion budgeted at US$73 million, could lead to full construction in Q4 2026 and first gold by Q2 2028.

    Technical Brief

    • Feasibility study assumes a base case gold price of US$3,500/oz, up from US$2,750/oz in the PEA.
    • Analyst Kevin O’Halloran now assigns Diamba Sud a net asset value of US$896 million, up 12%.
    • Total forecast gold output is 25% higher than the PEA, at 1 Moz over the mine life.
    • Internal rate of return has dropped by 12 percentage points, now reported at 60% post-tax.
    • Early works budget of US$73 million covers access road construction and expansion of the accommodation camp.
    • Site lies ~600 km east of Dakar in the Kenieba-Koudougou inlier, near other large gold deposits.
    • Fortuna acquired Diamba Sud in 2023 via its purchase of Africa-focused explorer Chesser Resources.
    • Séguéla mine expansion is forecast to lift that operation’s annual output 40% to 214,000 oz by 2029, framing regional processing and logistics synergies.

    Our Take

    Fortuna Mining’s push at Diamba Sud and the Séguéla mine mirrors the 2025-12-15 piece in our database that flagged a strategic pivot to West Africa to rebuild roughly 500,000 oz/y of gold output, suggesting Diamba Sud is being sized as part of a multi-asset regional platform rather than a standalone bet on Senegal.

    With Diamba Sud’s post-tax NPV of about US$1 billion against a market capitalisation of roughly C$3.5 billion, Fortuna is allocating a large share of its equity value to a single Senegal gold asset, which typically increases investor scrutiny on execution risk and permitting timelines in eastern Senegal and the Kenieba-Koudougou inlier.

    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

    Kazakhstan in focus: mining strategy and risk takeaways for project teams
    Mining
    about 4 hours ago

    Kazakhstan in focus: mining strategy and risk takeaways for project teams

    Kazakhstan is positioning itself as an active broker between Russia, China and the West, leveraging assets such as the reopened Soviet-era National Geological Survey archive and state uranium producer Kazatomprom while reclaiming major industrial sites like the Qarmet steelworks and the Kostenko coal mine, where 46 miners died in a 2023 explosion. Western oil majors Chevron and ExxonMobil have operated the Tengiz field since 1993, but that mega-project model does not translate directly to fragmented critical minerals supply chains dominated midstream by Chinese processing. For miners, the opportunity hinges on building non-Russian, non-Chinese export routes and in-country processing capacity in a state that now negotiates from far greater economic and political strength than in its early production-sharing era.

    South32–Alcoa $5.6B aluminium deal: portfolio and asset impacts for mine planners
    Mining
    about 4 hours ago

    South32–Alcoa $5.6B aluminium deal: portfolio and asset impacts for mine planners

    South32 is divesting nearly its entire aluminium portfolio to Alcoa in a deal valued at up to $5.6 billion, covering its 86% stake in Worsley Alumina, 100% of Hillside Aluminium in South Africa, and minority interests in Brazil’s MRN bauxite mine, alumina refinery and smelter, while excluding Mozal Aluminium in Mozambique. Alcoa will pay $3.1 billion in cash, $1 billion in shares (about 6% of its equity), assume roughly $750 million in liabilities and may add up to $750 million linked to aluminium prices to 2030. The transaction shifts South32’s portfolio to base and precious metals with an expected 85% of pro-forma EBITDA from these commodities and a targeted A$125 million per year overhead reduction, while Alcoa projects about $900 million NPV in synergies from the integrated mine–refinery–smelter chain.

    Guardian’s $660M Nevada tungsten mine: PFS economics and risk lens for engineers
    Mining
    about 4 hours ago

    Guardian’s $660M Nevada tungsten mine: PFS economics and risk lens for engineers

    Guardian Metal Resources may move directly from prefeasibility to construction at its Pilot Mountain tungsten project in western Nevada, after a new PFS returned a post-tax NPV8 of $660.3 million, 59.6% IRR and a one-year payback on $288.7 million in capex. The plan envisages an eight-year open-pit operation mining 11.8 million tonnes of probable reserves at 0.171% WO3, feeding a 4,000 t/d mill to produce 15,916 tonnes of 60% WO3 concentrate plus 2.1 million oz silver. Guardian targets adjusted operating costs of $54,622 per tonne WO3 (net of by-products), is filing its mine plan with the BLM next month and aims for all concentrate to be processed in the US.

    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.

    AllGeotechnicalMiningInfrastructureMaterialsHazardsEnvironmentalSoftwarePolicy