PolarX has extended high-grade copper mineralisation 60 metres beyond the Caribou Dome resource boundary, with one hole returning 58.5 metres at 2.0% copper. Magnetic data points to another 500 metres of potential western extension, although 13 assay results and further drilling remain outstanding.
- 58.5m at 2.0% copper and 3.9g/t silver in CD26-009
- Higher-grade intervals reached 9.7% copper and 19.5g/t silver
- Mineralisation extended 60m beyond the existing resource boundary
- Magnetic survey indicates a potential 500m western extension
- Assays pending for 13 additional holes
High-Grade Copper Pushes Beyond Caribou Dome Resource
PolarX Limited (ASX:PXX) has produced the kind of exploration result that can change the shape of a copper story: hole CD26-009 intersected 58.5 metres at 2.0% copper and 3.9g/t silver, roughly 60 metres west of the existing Caribou Dome mineral resource estimate.
The broader interval contains several sharper high-grade zones, including 2.1 metres at 9.7% copper and 19.5g/t silver, 2.4 metres at 6.6% copper and 15.2g/t silver, and 2.7 metres at 7.2% copper and 13.3g/t silver. Individual assays reached as high as 15.1% copper. The reported 58.5-metre interval has a calculated true width of 36.8 metres, according to the company’s table.
The result confirms the visible sulphide mineralisation reported in September and follows the earlier 9.8% copper intercept, which came from 24.8 metres in another Caribou Dome hole. Taken together, the assays support the presence of high-grade zones beyond the boundaries of the current resource, but they do not yet constitute an updated resource estimate.
Magnetic Trend Points to Further Western Ground
PolarX’s 25-metre-spaced magnetic survey has identified a potential extension running at least another 500 metres west of CD26-009. The company says geological observations from the drill core also point towards a possible feeder zone, where copper-bearing fluids may have concentrated mineralisation around gabbroic intrusions and altered calcareous rocks.
That interpretation remains exploratory rather than established. The filing says further work is planned to define the zone’s significance, while the company intends to test the western extension with drilling during the 2027 exploration season.
Deep Drilling Adds a Second Exploration Question
Hole CD26-008, drilled to 650 metres through the central part of the deposit, returned a narrower 0.3-metre interval at 2.1% copper and 2.2g/t silver at 245.3 metres. The hole also intersected lower-grade mineralised zones at depth, which PolarX says provide information about fault offsets and the continuation of Caribou Dome below the currently known mineralisation.
The company is cautious on the significance of that deeper result, saying more drilling is required to determine whether larger mineralised zones exist at depth. Assays are still pending from 13 holes drilled during the 2026 campaign, which covered 6,687 metres and was completed in September.
Northern Star Funding Keeps Exploration Moving
The drilling is being funded through the Alaska Range Joint Venture with Northern Star Resources (ASX:NST), which has contributed US$6 million for the 2026 programme and earned a 30% interest in the venture. Northern Star can contribute up to US$39 million over five years for an interest of up to 70%.
Caribou Dome currently contains 224,375 tonnes of contained copper in its resource estimate, while PolarX’s nearby Zackly deposit adds 45,000 tonnes. Both estimates were calculated more than three years ago, but the announcement provides no revised resource, economic study, metallurgical results or production timetable. The next hard test is whether the remaining assays and 2027 drilling convert a promising western signal into enough continuous mineralisation to change those numbers.
Bottom Line?
The discovery case is strengthening, but the investment significance depends on continuity, the 13 pending assays and whether future drilling can support a materially larger resource.
Questions in the middle?
- Will the 13 pending assays confirm that high-grade copper continues consistently beyond the current resource boundary?
- Can 2027 drilling establish a continuous mineralised system along the 500m western magnetic trend?
- Will an updated resource and economic study show that the new extensions materially improve the Alaska Range project?