Polymetals Resources Ltd has returned further high-grade assay results from ongoing underground diamond drilling at the Endeavor mine in Cobar, New South Wales, highlighted by drillhole POL025 returning 39.00 metres at an estimated true width of 23 metres grading 676 g/t silver equivalent, comprising 502 g/t silver, 6.9% zinc, 5.4% lead and 0.87 g/t gold from 17 metres downhole.

The current underground program continues to target the upper Main Lode surrounding the historical 1996 subsidence zone. Additional high-grade sulphide results include drillhole POL022A, which intersected 42.80 metres at 550 g/t silver equivalent (358 g/t silver, 8.3% zinc, 4.7% lead and 1.25 g/t gold) from 19.4 metres, and drillhole POL017, which returned 32.75 metres at 567 g/t silver equivalent from 26.25 metres.

Drilling designed to test the upper projection of the system into the weathered, oxidised and supergene zone has identified pronounced metal zonation. Holes POL027 to POL030 intersected intervals characterised by strong lead enrichment alongside zinc depletion and lower silver grades, including 22.5 metres at 6.0% lead from 47.6 metres in POL030 and 9.7 metres at 4.7% lead from 53.5 metres in POL028.

“The latest drilling continues the remarkable consistency we have seen across the upper Main Lode, while giving us a much clearer understanding of the mineralised system.”

“We are now defining the geometry and continuity of the high-grade sulphide mineralisation, together with the metal zonation through the oxidised and supergene zone above it.”

“This growing geological understanding is reducing uncertainty and strengthening the model that will underpin the initial Mineral Resource estimate for the upper Main Lode later this year.”

— Jess Oram, Executive Director

Polymetals completed the full 100% acquisition of Cobar Infrastructure Pty. Ltd. and the Endeavor project in July 2026 following the discharge of vendor security and the exchange of the environmental rehabilitation bond. The project serves as the core operational pillar for Polymetals as the company advances its strategy to build a high-grade silver and zinc production profile in the Cobar Basin.

The accumulated assay data and geological interpretations are being incorporated into resource models to support the release of an initial Mineral Resource estimate for the upper Main Lode, which Polymetals targets for later in 2026.

Read the full announcement: High-Grade Silver-Zinc Hits Continue at Endeavor Mine