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    Antimony’s “perfect storm” at Hillgrove: design and flowsheet notes for mine planners

    November 21, 2025|

    Reviewed by Joe Ashwell

    Antimony’s “perfect storm” at Hillgrove: design and flowsheet notes for mine planners

    First reported on MINING.com

    30 Second Briefing

    High-grade tungsten mineralisation has been intersected at Larvotto Resources’ Hillgrove project in New South Wales, adding a second critical metal to a site already known for antimony. Managing director Ron Heeks describes antimony as caught in a “perfect storm” of falling global mine output and rapidly rising demand from defence and energy-storage sectors, positioning Hillgrove’s combined antimony–tungsten potential as strategically significant. For mine planners and metallurgists, the find raises questions on future polymetallic flowsheet design and prioritisation of drilling to define tungsten resources alongside existing antimony targets.

    Technical Brief

    • Hillgrove is an historic high-grade antimony–gold field with existing underground workings and processing infrastructure.
    • Larvotto’s current drilling is targeting extensions to known lodes rather than greenfield step-out positions.
    • Existing decline and level development could shorten lead time to first ore once a restart decision is made.
    • Brownfield status reduces permitting risk compared with new antimony–tungsten projects on undeveloped tenements.
    • Legacy plant and tailings facilities will require refurbishment and possible flowsheet modification to handle tungsten-bearing ore.
    • For other polymetallic brownfields, Hillgrove illustrates the value of reassessing historic single-commodity mines for additional critical metals.

    Our Take

    Antimony and tungsten appear in only a handful of keyword-matched pieces in our database, signalling that Hillgrove-style projects in New South Wales are operating in relatively under-reported critical mineral markets compared with lithium or copper.

    The related coverage of IGO’s Kwinana refinery difficulties with lithium hydroxide and tungsten trioxide highlights how downstream processing risk can be as material as mine supply for specialty metals, something antimony developers at Hillgrove will need to factor into offtake and processing route decisions.

    With Australia already prominent in our Mining/Projects coverage, a New South Wales antimony–tungsten asset like Hillgrove positions the state to capture some of the strategic critical minerals narrative that has so far been dominated by Western Australian battery metals projects.

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    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.

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