The 7,850 contiguous acre “Case Lake West Cesium and Spodumene Pegmatite Project” is located in the Larder Lake Mining division of Ontario, Canada, roughly 100 km north of Kirkland Lake, NE Ontario prospective for Cesium and Spodumene Pegmatites directly bordering Power Metals Corp.’s (PWM) Case Lake cesium and pegmatite swarm discovery. On May 22, 2024, Power Metals announced, “world-class cesium results up to 18.13 per cent at Case Lake.” This was very exciting news regarding this growing cesium district. Sienna management cautions that past results or discoveries on properties in proximity to Sienna may not necessarily be indicative of the presence of mineralization on the Company’s properties.
On April 17, 2025, Sienna Resources Inc. announced that the Company has received results from drill hole assays submitted on its 100% owned Case Lake Project, 80 km east of Cochrane, Ontario. Intersections of silver (Ag) were drilled including: 8.3 g/t Ag over 1.5 m within 6 m of 2.8 g/t Ag from 137 m downhole; 0.6 g/t Ag over 36 m including 1.0 g/t Ag over 13.5 m from 67 m downhole (See Table 1). The drill program successfully identified a polymetallic volcanogenic massive sulphide (VMS) system with intercepts of silver and copper, manganese, and zinc. The company believes that there is potential for a VMS system at the Case Lake property as only 600 m of strike have been tested on the ~2 km long structure.
Figure 1: Plan map of Case Lake drill holes with Ag (g/t) assays (coordinates in WGS84 / UTM Z17N).
Table 1: Significant intercepts from maiden drill program at the Case Lake Project.
| Drill Hole | From (m) | To (m) | Length (m) | Ag (g/t) | Cu (ppm) | Mn (ppm) | Zn (ppm) |
| CL25-01 | 118 | 148 | 30 | 0.3 | 105.0 | 878.7 | 354.7 |
| including | 130 | 134.5 | 4.5 | 0.5 | 150.0 | 617.0 | 834.7 |
| CL25-02 | 67 | 103 | 36 | 0.6 | 189.5 | 976.5 | 155.6 |
| including | 83.5 | 97 | 13.5 | 1.0 | 363.6 | 808.7 | 137.4 |
| CL25-02 | 137 | 143 | 6 | 2.8 | 50.3 | 952.5 | 97.0 |
| including | 137 | 140 | 3 | 5.3 | 59.0 | 760.0 | 54.0 |
| including | 137 | 138.5 | 1.5 | 8.3 | 71.0 | 665.0 | 35.0 |
| CL25-03 | 285 | 294 | 9 | 0.6 | 100.3 | 1393.2 | 172.0 |
| and | 316.5 | 322.5 | 6 | 0.6 | 53.0 | 2437.5 | 101.3 |
| and | 328.5 | 331.5 | 3 | 0.5 | 90.5 | 2495.0 | 79.0 |
Table 2. Diamond drill hole parameters (WGS84 UTM Zone 17N).
| Collar ID | Easting (m) | Northing (m) | Elevation (m) | Azimuth | Dip | Length (m) |
| CL25-01 | 580257 | 5427830 | 340 | 360 | -45 | 297 |
| CL25-02 | 579836.4 | 5427857 | 340 | 360 | -45 | 333 |
| CL25-03 | 579700 | 5427970 | 330 | 5 | -50 | 396 |
Management cautions that past results or discoveries on properties in proximity to Sienna may not necessarily be indicative to the presence of mineralization on the Company’s properties. Mr. Frank Bain, P.Geo., a Qualified Person as defined by National Instrument 43-101 has reviewed and approved the scientific and technical disclosure contained within this website.
