Image source: © 2025 Krish Capital Pty. Ltd.

Highlights:

  • WR1 reports commencement of cesium-focused sampling at Sirmac-Clapier Project in Quebec.
  • WR1 identifies high-grade cesium-lithium mineralisation from 2024 fieldwork for follow-up targeting.
  • WR1 plans drill program following surface sampling and LiDAR-based outcrop analysis.

Winsome Resources Ltd (ASX:WR1) has initiated the next stage of exploration at its wholly owned Sirmac-Clapier Project in Quebec, Canada. The company announced the launch of a cesium-focused field program following the discovery of high-grade cesium-lithium mineralisation at surface during the 2024 field season.

The Sirmac-Clapier Project is located in the Eeyou Istchee James Bay region, approximately 30km from provincial road infrastructure and about 100km north of the towns of Chibougamau and Chapais, which provide access to the regional rail network. The project also sits 40km from Sayona’s Moblan Lithium Deposit.

According to the company, field activities will center around the “discovery outcrop,” where previous sampling returned encouraging results. The latest campaign will include close-spaced sampling across this outcrop to define the extent and orientation of mineralised zones. These results will be used to determine final drill targets.

In addition to this work, further outcrops across Winsome’s landholding will be investigated, particularly those aligned with the mineralised trend identified from the original discovery zone. The program does not require helicopter support, as field crews can access targets using existing ATV tracks.

The June 2024 discovery included a channel sample result of 26 meters at 2.69% Li₂O, 1.15% Cs₂O, and 401 ppm Ta₂O₅, with cesium intervals such as:

  • 4 meters at 3.08% Cs₂O and 1.27% Li₂O
  • 4 meters at 2.23% Cs₂O and 2.13% Li₂O

Cesium oxide values peaked at 5.44% Cs₂O and 2.92% Cs₂O, which the company believes indicates the presence of the mineral pollucite, although mineralogical confirmation is still pending. These high-grade readings were disclosed in a prior ASX release on 20 February 2025.

Sampling around Channel 2 will be carried out at high density to better understand the mineralisation geometry and surface continuity. The company also plans to investigate other prospective pegmatite outcrops identified through LiDAR and aerial image interpretation. Several of these outcrops, trending northeast, are located near the discovery zone and align with patterns observed in neighbouring tenements.

Geochemical analysis conducted by Dr. Nigel Brand identified that the sampled pegmatite was highly fractionated—an attribute often associated with enrichment in rare elements such as cesium, lithium, and tantalum.

Winsome’s Managing Director, Chris Evans, acknowledged the next phase of exploration while referring to the company’s exposure to cesium through its stake in Power Metals Corp (TSX-V: PWM). This includes offtake rights to lithium, cesium, and tantalum from the Case Lake Project in Ontario.

Fieldwork is expected to take two to three weeks, with assay results anticipated within six to eight weeks. These findings will inform the design of the company’s maiden drill campaign at Sirmac.

As of 9 July 2025, Winsome Resources’ shares were trading 31.03% higher at AUD 0.19 per share following the announcement.