PolarX Limited has intersected broad zones of massive sulphides with visible chalcopyrite in two diamond drill holes located approximately 60 metres west of the existing resource at the Caribou Dome Copper Project in Alaska.

The drilling is part of the Alaska Range Project joint venture with Northern Star Resources Limited, through which Northern Star is funding exploration and resource expansion programs to earn up to a 70% interest.

Hole CD26-009 returned a broad massive and semi-massive sulphide zone spanning 57.5 metres, containing significant visible chalcopyrite. Meanwhile, hole CD26-013 intersected five separate zones of massive and semi-massive sulphides totaling 35.4 metres. Preliminary geological logging indicates the mineralisation features replacement textures within hydrothermal breccias across multiple intervals, which geologists interpret as potential feeder zones to the wider copper system.

The current intercepts compare with previous drilling at the project, such as holes reported in June 2024 that intersected copper-bearing massive sulphide intervals of 8.3 metres and 12.65 metres. The Caribou Dome deposit currently hosts a JORC Mineral Resource estimate of 7.2 million tonnes at 3.1% copper and 6.5 g/t silver, containing 224,375 tonnes of copper and 1.5 million ounces of silver from surface down to a depth of 300 metres.

Exploration drilling within the western extension zone is ongoing, with approximately 2,000 metres of further planned drilling expected to be completed by the end of September 2026. Because the massive sulphides are extremely fine-grained, visual estimates of mineral abundance are not considered a proxy for laboratory analysis. Laboratory analytical results for drill holes CD26-009 and CD26-013 are anticipated to become available in October 2026.

Read the full announcement: Drilling hits massive sulphides with visible chalcopyrite