Key Highlights

  • Greater Oko drilling has passed 10,000 metres, with over 6,000 metres of Reverse Circulation Drilling completed at South Oko.
  • An in-situ grab sample returned 32.98 grams per tonne gold from the floor of a trench adjacent to current drilling.
  • Maiden assays for the northern portion of the W1 target are expected within four to five weeks.
  • Guyana's assay laboratories experienced equipment and flux delays, and about 5,000 duplicate samples have been sent to Suriname for quality testing.

Altair Minerals Limited (ASX:ALR) has provided an update on drilling at South Oko, part of its Greater Oko project in Guyana. The announcement, dated 10 November 2026, reports that total drilling across Greater Oko has passed 10,000 metres and that three structural corridors have emerged at South Oko. The company also reports a high-grade grab sample and new soil results at a separate parallel shear target.

Drilling Progress at South Oko

Reverse circulation drilling at South Oko has completed more than 6,000 metres across 102 holes, averaging about 61 metres deep, using two rigs. The company says the drilling has logged quartz veining, alteration and pyrite across three distinct structural corridors. A new eastern corridor, which had not been tested by deep trenches, has been defined by a scout line showing sulphides, quartz, alteration and foliation.

The company has also secured an additional diamond drill rig to follow up mineralisation identified by reverse circulation drilling and to test the enriched core of the system at depth. Maiden assays covering the northern part of the W1 target are expected within four to five weeks, including holes beneath trench TR04, which previously returned 10 metres at 1.42 grams per tonne gold.

Trench and Geochemical Results

A high-grade in-situ grab sample of 32.98 grams per tonne gold was taken about seven metres from the 10 metre at 10.15 grams per tonne interval in trench W1-06, which is currently being drilled. A second in-situ sample returned 2.65 grams per tonne gold about 10 metres along strike. The company reads these results as indicating mineralisation continuing beyond the trench channel line, consistent with its interpretation of the shear corridor beneath duricrust cover.

Grab samples are selective and do not represent the average grade of a zone. The company's interpretation depends on the continuity of mineralisation between sample points and drill holes, which the maiden assays will help test.

New Parallel Shear Target

About four kilometres west of W1, first-pass soil lines returned up to 1,669 parts per billion gold, or 1.67 grams per tonne. The company also reports a wider zone of about 300 metres with 59 to 201 parts per billion gold on a line about 200 metres east of that result. The company describes this as making the new target more prospective, though soil results from first-pass lines require follow-up drilling to confirm.

Laboratory Delays in Guyana

Both ISO-certified laboratories in Guyana have recently resolved equipment failure and flux shortages that caused country-wide assay delays. As a precaution, about 5,000 duplicate samples have been sent to Suriname to test quality control on Photon Assay methods. If the validation is successful, Altair could engage a third laboratory. Delays in assay turnaround affect the pace at which drilling results can be interpreted and acted on.

Risks and Matters to Monitor

Visual logging of quartz veining, alteration and sulphides is a preliminary indicator, and the company itself cautions that visual estimates should not substitute for laboratory analysis. Trench and soil results are early-stage, and the surface duricrust limits exposure. Laboratory capacity, the cost of multiple drill rigs and the results of the duplicate testing are factors that could affect timing.

Final Word

Altair's South Oko program has moved from scout work to over 10,000 metres of drilling across Greater Oko, with trench and soil results pointing to additional corridors. The next key measures are the maiden W1 assays, the follow-up diamond drilling and the outcome of the laboratory quality testing. Those results will show whether the corridors described carry grade at a scale that justifies further work.