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
    Product

    FLS Knelson and gravity gold recovery: circuit design notes for plant engineers

    February 26, 2026|

    Reviewed by Joe Ashwell

    FLS Knelson and gravity gold recovery: circuit design notes for plant engineers

    First reported on International Mining – News

    30 Second Briefing

    FLS product manager Chris Arnold says high gold prices are driving miners to maximise gravity-recoverable gold (GRG) using Knelson Concentrators in mill circuits rather than relying solely on cyanide leaching. Plants that previously treated only a small bleed of the mill circulating load are now considering full-stream or multiple Knelson installations, targeting GRG often above 50–70% of total gold in suitable ores. The shift demands tighter cyclone control, upgraded pump capacity and careful integration of intensive leach reactors for the Knelson concentrate.

    Technical Brief

    • Knelson Concentrators use high-g centrifugal fields to separate dense GRG from mill discharge slurry.
    • Units operate as fluidised-bed concentrators, with water injection maintaining bed stratification and minimising blinding.
    • Concentrate is periodically or continuously discharged as a high-grade, low-mass stream for intensive leaching.
    • Cyclone underflow is typically the preferred Knelson feed, exploiting coarser, denser particle residence.
    • Circuit layouts often include dedicated gravity-recovery pump boxes and bypass lines for maintenance flexibility.
    • GRG testing is used to quantify gravity-recoverable fractions before design.
    • Knelson installations are commonly retrofitted into existing mills with minimal footprint, using modular skid-mounted packages.
    • For brownfields, gravity circuit upgrades offer relatively low capital intensity compared with new leach or flotation capacity.

    Our Take

    FLS’s focus on Knelson gravity gold recovery sits alongside a broader push into high-value processing equipment in our database, with recent pieces covering its semi-mobile crushing station at Vale’s S11D iron ore mine and a major comminution package for a South American copper concentrator.

    The current article is one of relatively few gold-specific items within our mining coverage compared with iron ore and copper, suggesting FLS is using the high gold price environment to rebalance its portfolio messaging toward precious metals as well as bulk and base commodities.

    With FLS’s new CEO, Toni Laaksonen, coming from the service business line, the emphasis on Knelson concentrators for gold likely aligns with a strategy to grow aftermarket and optimisation services around installed gravity circuits rather than just one-off equipment sales.

    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

    Flexco conveyor reliability tools: key maintenance takeaways for coal mines
    Mining
    about 3 hours ago

    Flexco conveyor reliability tools: key maintenance takeaways for coal mines

    Flexco is using the Queensland Mining & Engineering Exhibition in Mackay to showcase next‑generation conveyor reliability tools for coal operations facing tighter maintenance windows and labour shortages. The company is focusing on fast-install belt cleaners, condition‑monitoring hardware and data platforms that allow remote inspection of idlers, pulleys and splices without shutting down production. For mine operators, the pitch is higher conveyor availability on long overland and plant belts, reduced manual belt-walks, and more predictable shutdown planning in high‑throughput Queensland coal plants.

    Mining
    about 3 hours ago

    Tía María Komatsu AHS trucks: haul road and traffic design notes for mine engineers

    Southern Copper’s Tía María greenfield copper project in Arequipa will be the first mine in Peru to operate Komatsu autonomous haulage system (AHS) trucks, supplied and supported by Komatsu-Mitsui. CEO Julio Molina told Día1 de El Comercio that the deployment will use Komatsu’s state-of-the-art AHS platform, signalling a shift towards driverless haul fleets in the country’s large open pits. The move will require detailed redesign of haul roads, traffic management and dispatch systems to meet AHS requirements for berms, gradients and separation from manned equipment.

    Aclara’s Penco rare earths approval: project economics and design notes for engineers
    Mining
    about 3 hours ago

    Aclara’s Penco rare earths approval: project economics and design notes for engineers

    Aclara Resources has secured its Environmental Qualification Resolution for the Penco Module ionic clay rare earth project near Penco, 430 km south of Santiago, concluding a permitting process that ran for more than four years. The project is scoped to produce about 774 tonnes of rare earth oxides annually over 14 years, with a 2021 PEA outlining initial capital of $119 million, an after-tax NPV of $178 million at a 5% discount rate, a 23% IRR and a 4.7-year payback. Penco ore will ultimately feed Aclara’s planned commercial separation plant in Louisiana, supported by a Virginia Tech pilot facility producing both light and heavy rare earth oxides.

    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.

    AllGeotechnicalMiningInfrastructureMaterialsHazardsEnvironmentalSoftwarePolicy