Highlights

  • First systematic drilling at Yataga Valley began in July 2026
  • Sixteen RC holes completed, with samples at the laboratory
  • Diamond hole 26YVRD012 reached about 735 m, the rig's operational depth limit
  • Combined drilling of 3,445 m reported
  • The September-quarter update reported 3,879 m of drilling and the initial receipt of RC assays

EMU NL (ASX:EMU) explores copper and other minerals in North Queensland, including at its Yataga Valley Copper Project near Georgetown. Its July-to-September 2026 drilling program advanced the first systematic tests of the project, with more drilling and initial laboratory sample results reported in later updates.

Drilling begins in July

In an announcement dated 1 July 2026, EMU said mobilisation was complete and drilling was scheduled to begin in the first week of July. ASX:EMU described the program as its first systematic drilling campaign at the site, following mapping, geochemical sampling, geophysical interpretation and target generation.

Managing Director Doug Grewar called Yataga Valley a "highly prospective copper-silver system." The targets include structural corridors, overlapping geochemical and geophysical anomalies and known surface mineralisation.

Results of the September update

In its 2 September 2026 update, ASX:EMU reported that 16 reverse circulation (RC) holes had been completed and that samples were with the laboratory. Combined drilling at that point, including RC holes and diamond hole 26YVRD012, totalled 3,445 m. By 30 September 2026, the company reported approximately 3,879 m of combined drilling, comprising 2,941 m of RC and 938 m of diamond drilling.

According to the update, 26YVRD012 is an RC pre-collar with a diamond tail from 231 m and was advanced to approximately 735 m, where the rig reached its operational depth limit. The hole tests a priority target beneath the central valley, where copper geochemistry, major structures, a magnetic low and an induced polarisation chargeability response coincide.

The company reported that the hole passed from relatively homogeneous granodiorite into a more complex environment with multiple intrusive phases, aplite and pegmatite phases, hydrothermal alteration, quartz veining and localised zones of increased vein and shear development.

Next steps set out by the company

The September 2026 progress reports described continuing appraisal of another deep hole, 26YVRD015, and evaluation of further targets. In its subsequent quarterly disclosure, ASX:EMU said initial RC assay results had begun arriving, while diamond drilling assay results were expected in early November 2026. These were company-reported timing expectations.

The company said the sequence and depth of further drilling will depend on drilling observations, mapping, geophysics and assay results.

Key Insights

The ASX:EMU updates show that combined drilling progressed from 3,445 m in early September to approximately 3,879 m by quarter end. Geological observations included shear and vein structures with visible sulphides; these observations alone do not establish copper grades or an economic mineral deposit.

Initial RC assays had started arriving by the September-quarter update, whereas diamond assay results were still expected. ASX:EMU reported that interpretation and the sequence of further drilling would depend on verified analytical results, mapping and geophysical data.

The company indicated that the next exploration phase would be determined after integrating drilling, assay and mapping results. Its stated timing for remaining results was subject to laboratory processing and technical review.