Managing director Alex Cheeseman described the latest assays – 50m at 1.28% lithium from 204m and 65m at 0.84% from 186m, including 26m at 1.3% – as “exceptional” and “game changers” for Mavis Lake.

The holes intersected high-grade spodumene zones of up to 4.18% and were completed east and west of the earlier intercept of 74m at 1.18%, including 33m at 1.81%.

The high-grade Swell Zone now extends along 200m of strike, with consistent thicknesses and grades.

Critical is permitting additional drill pads, and believes the results will deliver a significant resource update next year. The new pads are needed to more properly test the pegmatite geometry in the west.

Critical believes it can deliver the largest single site JORC resource in Ontario next year, up from its initial eight million tonnes at 1.1% lithium oxide today.