Metallic Minerals Corp. announced results from its fall 2023 exploration drilling campaign at the Company's 100%-owned, 171 square kilometer Keno Silver project, adjacent to Hecla Mining ("Hecla") in the high-grade Keno Hill silver district of Canada'sYukon Territory. The 2023 exploration program included 1,112 meters ("m") in four diamond drill holes focused on expansion of the Formo target in the West Keno area, which is on trend with the 100 million-ounce ("Moz") historic Hector-Calumet mine controlled by Hecla.

Drill hole FOR23-03 represents one of the best intercepts to date for the Keno Silver project, returning grades of 256 grams per tonne (g/t) silver equivalent recovered ("Ag Eq") over 46 m. This is also the deepest intercept to date on the Formo vein structure (only 275 m vertically from surface) and mineralization remains fully open down dip and along strike. Formo is anticipated to be one of the high grade and large contributors to the forthcoming inaugural NI-43-101 mineral resource estimate for the Keno Silver project, currently nearing completion by SGS Geological Services. Western Keno Hill district is host to the large historic production and current resources in the prolific Keno Hill silver district.

The Formo target is located at the intersection of a north-easterly structural zone extending from the Hector-Calumet mine, which was the large producer in the district producing nearly 100 million ounces of silver and the Elsa structural trend, which was the second large silver producer in the district. The Formo property, which includes the historic Formo Mine, was acquired by Metallic Minerals in 2017. The historic Formo mine produced high-grade silver at various times since the 1930s from high-grade vein structures that graded over 1,000 g/t silver1.

Significant underground exploration drifts were developed in the 1950s with most of the historic production from an open pit located alongside of the Silver Trail highway between the Elsa townsite and Keno City and last mined in the 1980s. The primary Formo vein structure is exposed at surface in an open cut. Multiple veins have been encountered in the target area that demonstrate an association with Triassic greenstones in the Earn group schist, similar to the Sadie Ladue deposit which produced 12.7 Moz silver at a grade of 1,620 g/t Ag1.

In addition to the mineralization at the known Formo target, two new surface targets have been identified through soil and rock sampling along the same structural corridors that show potential to host high-grade and bulk tonnage Keno-style Ag-Au-Pb-Zn veins on the Formo property. Since 2020, Metallic Minerals has drilled 26 holes (4,419 m) at the Formo target building on the six core holes and 54 percussion holes drilled by previous owners between 1980 and 1981. The Formo target is open to significant expansion down dip and along trend with several newly identified targets for drill testing .

The upcoming inaugural independent 43-101 mineral resource estimate is focused on four initial deposits across the Keno Silver project, including: Formo, Caribou, Fox and Homestake. These four deposits are the most advanced of over 40 identified target areas, each of which is characterized by a kilometric scale Ag in soil anomaly, exposed outcropping high-grade veins, and varying levels of exploration activity or historic production. Metallic Minerals has completed 165 drill holes totalling 18,983 m of combined reverse circulation and diamond core drilling at the Keno Silver project since 2017 on a total of 11 targets, all of which have returned encouraging results.

The four most advanced "resource-ready" targets will be part of the upcoming mineral resource estimate being completed by SGS Geological Services and include: Formo Target - In the West Keno District, it demonstrates potential for lower-cost bulk tonnage mining or high-grade selective methods with drill highlights including: Hole FOR22-04 - 20.87 m @ 220.5 g/t Ag Eq (144.6 g/t Ag, 0.70% Pb, 1.59% Zn), and 1.63 m @ 1,487.19 g/t Ag Eq (1,049 g/t Ag, 4.21% Pb, 9.45% Zn) Hole FOR21-05 - 19.8 m @ 216.26 g/t Ag Eq (70 g/t Ag, 0.41 g/t Au, 0.30% Pb, 2.07% Zn) and 0.7 m @ 1,405 g/t Ag Eq (421.0 g/t Ag, 0.15 g/t Au, 1.53% Pb, 24.2% Zn) Hole FOR20-003 - 3.0 m @ 2,954.52 g/t Ag (1,568 g/t Ag, 29.45% Pb, 1.35% Zn) Caribou Target - In the Central Keno target area the Caribou target historically produced very high-grade material from a shallow surface pit grading more than 6,000 g/t silver. Fox Target - Discovered by Metallic Minerals in 2020 in the East Keno target area, the Fox target is characterized as a newly recognized bulk tonnage style of mineralization with shallow-dipping sheeted vein sets up to 177 m in width. Drilling since 2020, has defined a bulk-tonnage mineralized block over 300 m along strike and 150 m down-dip from surface which is open in all directions.

Homestake Target - A historic producer, the Homestake target in the Central Keno area is fractally spatial with the districts' giant past producers and current resources (Silver King, Elsa, Bermingham, Hector Calumet, Flame & Moth and Bellekeno) near the contact of the Keno Hill Quartzite and Sourdough Hill formations. With only 88 drill holes (slightly over 5000 m of drilling), and a strike length over 2 km the Homestake target represents considerable resource opportunity and exploration potential. Metallic Minerals sees considerable opportunity for resource growth from target expansion and new discovery with the further systematic application of exploration, including the expansion of detailed soil geochemical grids, "resource-ready" target expansion through drilling and reconnaissance drilling of early-stage targets.