PMET Resources has reported the widest drill intercept to date at the newly discovered Helios Caesium Zone, according to assay results from the final seven holes of its 2025 Shaakichiuwaanaan drill campaign, in Northern Quebec, Canada.
The reported drill holes targeted caesium mineralisation at the CV13 Pegmatite.
The latest results for CV25-979 identified a rock layer with mineralization at a 4.9m interval with an average 3.65% concentration of cesium oxide Cs2O. Within that, Cs₂O concentrations of 6.14% were found at the 1.7m interval.
Strong caesium grades intersected in drill holes located outside the known mineralised zones at the CV13 Pegmatite also indicated the presence of a new mineralised lens north of the Vega Zone: 2.3m at 4.65% Cs2O (CV25-999).
The CV13 Pegmatite, which hosts the caesium mineral resource, is located about 3km along trend from the CV5 Pegmatite, 13km south of the regional Trans-Taiga Road and powerline infrastructure corridor, and is accessible year-round by road.
In addition to being one of the largest lithium-tantalum pegmatite mineral resources and lithium pegmatite mineral reserves globally, Shaakichiuwaanaan hosts the world's largest in-situ pollucite-hosted caesium pegmatite resource, comprising 0.69 Mt at 4.40% Cs2O (Indicated) and 1.70 Mt at 2.40% Cs2O (Inferred).
Darren L. Smith, PMET Executive Vice President Exploration, said: "The results conclude reporting for all drill holes the 2025 Shaakichiuwaanaan drilling campaign, which has delivered multiple significant new discoveries and further demonstrated the globally relevant scale, grade, and multi-commodity critical mineral potential of the property."
A total of 57,024m (245 holes) of drilling was completed in 2025, with results for lithium, caesium, and tantalum now reported for all drill holes.
PMET's geology team is currently interpreting and working with the datasets to advance host rock and pegmatite geological models. Work is focused on the CV5 and CV13 pegmatites – including the Vega, Rigel, and Helios caesium zones.
