Polymetals’ Endeavor silver hits: stope design and restart notes for engineers
Reviewed by Joe Ashwell

First reported on Australian Mining
30 Second Briefing
Polymetals Resources is reporting further high-grade silver, lead and zinc intercepts from underground diamond drilling at the Endeavor mine in New South Wales, as it advances towards an initial mineral resource estimate. The latest holes have improved confidence in the continuity and geometry of the mineralised zones, supporting mine planning around existing underground development. For geotechnical and mining engineers, the emerging orebody definition will influence stope design, ground support requirements and sequencing for any restart or expansion of underground operations.
Technical Brief
- Similar brownfield underground projects increasingly rely on targeted infill drilling to de-risk restart capital allocation.
Our Take
Our database shows Polymetals Resources moving from capital raising for the Endeavor restart in late 2025 to first concentrate shipments by early 2026, so continued high‑grade silver, lead and zinc intercepts now will likely feed directly into near‑term mine plans rather than a distant development case.
Within the 268 keyword‑matched pieces on silver and lead, Endeavor is one of the few New South Wales assets transitioning from care‑and‑maintenance back to production, which tends to give operators more flexibility to quickly re-optimise stopes and sequencing around any new high‑grade zones.
Given Endeavor’s location in the established Cobar district of New South Wales, the combination of existing processing infrastructure and fresh high‑grade silver–lead–zinc hits suggests Polymetals can focus investment on targeted underground development and potential life‑extension drilling rather than major new plant capex.
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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