Youanmi underground dewatering: geotechnical mapping and design notes for engineers
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Dewatering of the main pit at Rox Resources’ Youanmi gold project in Western Australia has been completed, exposing the historic Youanmi underground workings for the first time in decades and clearing the way for decline access. The work allows detailed geotechnical mapping of existing drives and stopes, assessment of ground conditions around legacy voids, and planning of new underground infrastructure tied to the existing shaft and portal locations. Engineers will now be able to refine support regimes, groundwater management and backfill strategies based on direct inspection rather than historic records.
Technical Brief
- Dewatering targeted the main open pit immediately above the historic Youanmi underground mine infrastructure.
Our Take
In our database of Mining–Projects coverage, Youanmi is one of the few Western Australian gold assets with both a recent final investment decision and a fully secured multi-hundred-million-dollar funding package, which typically signals strong lender confidence in the underground mine design and dewatering strategy.
The earlier report on high-grade intercepts outside the current Youanmi definitive feasibility study mine plan suggests that dewatering the main pit could also unlock flexibility to re-optimise underground access and scheduling around those emerging zones.
Rox Resources’ selection of MACA Interquip Mintrex as preferred EPC contractor for the Youanmi processing plant indicates that, as dewatering progresses, there is already alignment between underground development timing and surface plant delivery, reducing interface risk that has delayed other Australian gold projects in our coverage.
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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