Metallic Minerals Announces Follow Up Exploration Results at its La Plata Project Including New Targets and High-Grade Rock Samples

VANCOUVER, BC / ACCESS Newswire / June 17, 2025 / Metallic Minerals Corp. (TSX.V:MMG)(OTCQB:MMNGF) ("Metallic Minerals" or the "Company") is pleased to announce positive surface rock sample results from its follow up district-scale exploration program at the La Plata copper-silver-gold-platinum group element ("Cu-Ag-Au-PGE") project in southwest Colorado, USA. The rock samples returned significant high-grade results from the field exploration work resulting in new untested priority targets and confirming highly prospective ground. The La Plata project defined a NI 43-101 Inferred Mineral Resource Estimate in July 2023 totaling 1.21 billion pounds ("Blbs") of Cu and 17.6 million ounces ("Moz") of Ag with 147.3 million tonnes ("Mt") at an average grade of 0.37 percent ("%") Cu and 3.72 grams per tonne ("g/t") Ag (0.41% copper equivalent ("Cu Eq"), using a 0.25% CuEq cut-off grade ¹ .

La Plata Exploration Program Highlights

• District-scale rock sampling and mapping, assisted by geologists seconded from Newmont Corporation ("Newmont"), has helped prioritize existing targets and identified four new target areas (Lower Boren, Middle Bedrock, New Star and T29 Ext.) displaying significant Cu, Ag, Au and PGEs including numerous Cu Eq grades over 1.5% Cu (see Table 1).

• The drill-ready Evening Star target returned some of the highest-grade surface rock samples which included 6.68% Cu Eq (7.38% Cu and 3.0 g/t Ag), and 6.53% Cu Eq (7.22% Cu and 3.0 g/t Ag). The Copper Age North target close to the current Allard resource, returned 5.94% Cu Eq (6.2% Cu, 36.0 g/t Ag and 0.24 g/t combined Au+PGEs (0.14 g/t Au, 0.03 g/t Pt, 0.06 g/t Pd).

• The top 30 samples from the program averaged 1.68% Cu Eq, with 12 samples exceeding 1% Cu Eq. Gold averaged 0.51 g/t with 7 samples above 1.0 g/t Au; Ag averaged 25.7 g/t, with grades reaching up to 426 g/t Ag; and the combined Pt and Pd results averaged 0.037 g/t with the highest value returning 0.30 g/t Pt+Pd.

• Additional work included mineralogical test work conducted by researchers at Cardiff University, results from the USGS' high-resolution airborne magnetic and radiometric survey over the La Plata District, and the Company's first community open house events.

Scott Petsel, President of Metallic Minerals, commented, "We are encouraged by the continued significant progress on the La Plata project to date having completed extensive district-scale exploration and target prioritization work in collaboration with Newmont's technical team. The program resulted in the advancement to a priority drill-ready status at three untested targets with over 25 additional target areas identified for additional work within the 25 square kilometer porphyry system footprint."

"Continuing in 2025, we anticipate the announcement of an updated mineral resource estimate for La Plata incorporating the most recent drilling funded by Newmont. This resource update will also integrate expanded precious metal analyses, including the first inclusion of Pt-Pd + Au, in addition to Cu and Ag, in the mineral resource estimate. Planned exploration programs in the second half of 2025 for both La Plata and our Keno Silver project are expected to be announced shortly."

Table 1. 30 Significant New Rock Sample Results from La Plata Project Exploration Program