METALLIS ANNOUNCES HIGH-GRADE DISCOVERY AT "1350 ZONE" INCLUDING 795 G/T SILVER EQUIVALENT* OVER 1.48 METERS /* Style Definitions */ span.prnews_span { font-size:8pt; font-family:"Arial"; color:black; } a.prnews_a { color:blue; } li.prnews_li { font-size:8pt; font-family:"Arial"; color:black; } p.prnews_p { font-size:0.62em; font-family:"Arial"; color:black; margin:0in; } Canada NewsWire VANCOUVER, BC, Dec. 4, 2025 /CNW/ - Metallis Resources Inc. (TSXV: MTS) (OTCQB: MTLFF) ("Metallis" or the "Company") announces the discovery of high-grade mineralization from the Company's inaugural diamond drilling program (the "Program") on the Greyhound Property ("Greyhound" or the "Property") in central Idaho, USA. This program was designed to test three priority targets along the 3.5 km shear zone, with many other high potential targets remaining untested. The first three drill holes at the 1350 Zone have returned multiple high-grade intervals of silver and gold, accompanied by significant antimony ("Sb"), lead, and zinc mineralization. Highlights include: 0.54 meters ("m") of 2,135 g/t AgEq* (including 2.0% Sb) in GH25-05, and 1.90 meters of 514 g/t AgEq* (including 0.50 m of 1,281 g/t AgEq*) in GH25-07 (See Table 1 for full multi-element results). Fiore Aliperti, Metallis' President and CEO commented, "This inaugural program has confirmed that the 1350 Zone is a robust, high-grade mineralized zone that warrants significant follow-up drilling to determine its full width, strike length, and vertical extent. The exceptional silver grades, combined with consistently strong gold values that were historically underappreciated, underscore the strength of this system. Antimony grades exceeding 5 percent further reinforce the critical-metal potential of Greyhound and add meaningful value in addition to the precious-metal endowment." He went on to add, "By identifying the position of the high-grade band within the thick shear and refining our understanding of the structural controls, the team has established a clear framework for expanding this discovery. As soon as seasonal access allows, we plan to return to build on these results and continue advancing what is shaping up to be a potentially transformative opportunity for Metallis and its shareholders. We are committed to unlocking its full value alongside our investors." Highlights: 5.02% antimony over 0.15 m in GH25-05, confirming strong critical mineral potential;High-grade silver intercepts in multiple holes; 3,050 g/t Ag from GH25-05, and 1,010 g/t Ag and 1,270 g/t Ag from GH25-07 (see Table 1);Broad intervals of mineralization in multiple holes including 15.45 m of 142 g/t AgEq* in GH25-07;Blind discovery of an additional shear zone in GH25-05 and GH25-07 demonstrates significant exploration potential adjacent to the main shear (See Figure 3);High gold grades identified such as 1.5 g/t Au over 3.8 m In GH25-05;The first three holes have defined an initial mineralized footprint, remaining open in all directions; andSuccessful targeting at the 1350 Zone has elevated the priority of several nearby untested targets, including the 500 and1500 zones. 1350 Target: Three drill holes at the 1350 Zone outlined a mineralized panel extending 60 m vertically and 70 m along strike, and also uncovered a previously unknown mineralized structure parallel to the main Greyhound shear. Drilling was designed to test above and below historic channel sampling in the 1350 Zone in the Lower Rufus Adit (939 g/t AgEq* over a strike length of 36.9 m†). The results confirm a steep, well-developed shear zone ranging from 6.7 m to 18 m in width**. A standout high-grade intercept in GH25-05 returned 4,859 g/t AgEq* over 0.15 m. Combined with broad intervals of moderate mineralization (e.g., 15.45 m of 142 g/t AgEq* in GH25-07), the results demonstrate significant high-grade potential and strong continuity within the structure. Gold grades, historically underappreciated on the property, have also been consistently elevated and the zone remains open in all directions. GH25-05Drill hole GH25-05 encountered two mineralized zones on the hanging wall and footwall of the targeted shear zone. At 129.55 m depth, a quartz sulphide vein was intercepted grading 795 g/t AgEq* over 1.48 m including a distinct high-grade band of 4,859 g/t AgEq* over 0.15 m. Strong shearing was encountered for 6.75 m with a footwall vein returning 423 g/t AgEq* over 1.08 m. A secondary, previously unknown shear was intersected approximately 50 m down-hole from the main structure, returning 403.8 g/t AgEq* over 0.75 m within 3.8 m of 179 g/t AgEq* starting at 180 m depth. This blind discovery highlights the potential for multiple parallel shears. GH25-06Drill hole GH25-06 targeted down dip extensions of the mineralized 1350 zone and intersected a long interval of sulphide-rich core 60 m vertically below GH25-05 thus confirming the orientation of the shear at this location. High sulphide content was logged across a broad zone and retu