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    Cowal–Molycop MillROC ramp-up: comminution control lessons for process engineers

    October 29, 2026|

    Reviewed by Tom Sullivan

    First reported on International Mining – News

    30 Second Briefing

    Evolution Mining’s Cowal Gold Operations in New South Wales has improved ramp-up and throughput in its large-scale gold processing plant using Molycop’s MillROC support on a conventional comminution circuit. The plant runs primary crushing followed by SAG and ball mills treating a blended open pit and underground ore feed ahead of flotation and leaching. For process engineers, the key change is tighter control of SAG–ball mill performance, directly affecting grind size, downstream recovery stability and overall plant throughput.

    Technical Brief

    • Conventional flowsheet at Cowal comprises primary crushing, SAG milling, ball milling, then flotation–leach.
    • Circuit is designed to treat a continuously varying blend of open pit and underground ore sources.
    • Blended feed requires close control of hardness variability to maintain stable comminution performance.
    • Focus is on operational decision support, not on hardware changes to the comminution circuit.
    • Integration of MillROC occurs on an existing large-scale plant, avoiding major capital modifications.
    • For similar mining operations, such decision-support layers are increasingly retrofitted onto conventional circuits.

    Our Take

    Evolution Mining’s recent move to a net‑cash position and record FY26 cash flow, as noted in our other gold coverage, means throughput gains at Cowal Gold Operations in New South Wales can translate more directly into self‑funded growth rather than balance‑sheet strain.

    Across our 1255 Mining stories, relatively few gold‑focused pieces are tagged both ‘Projects’ and ‘Product’, so the MillROC deployment at Cowal signals that Evolution Mining is treating vendor‑supplied process optimisation tools as a core project lever rather than a bolt‑on service.

    The same Evolution Mining items in our database that highlight decarbonisation work with Caterpillar suggest that efficiency improvements at Cowal’s processing circuit are likely being evaluated not only for gold output but also for their impact on site‑level energy intensity and emissions trajectories.

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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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