Ridgeline Minerals Reports Additional Assays for the Chinchilla Sulfide CRD Discovery at the Selena Project, NevadaVancouver, British Columbia--(Newsfile Corp. - December 18, 2025) - Ridgeline Minerals Corp. (TSXV: RDG) (OTCQB: RDGMF) (FSE: 0GC0) ("Ridgeline" or the "Company") is pleased to announce additional assay results for discovery drillhole SE25-053 at the Selena project ("Selena" or "Project") in Nevada. The lower sulfide horizon was intersected 94 meters beneath the previously announced upper zone discovery and returned a highlight intercept of 8.7 meters ("m") grading 175.5 g/t silver equivalent ("AgEq") or 7.3% zinc equivalent ("ZnEq") starting at 1,069m downhole (Figure 1 & Picture 1). Chad Peters, Ridgeline's President, CEO & Director commented, "Discovery hole SE25-053 has exceeded our expectations for a maiden drill program, intersecting three high-grade CRD horizons with a cumulative mineralized thickness of 27.2 meters. We are especially encouraged to have hit multiple stacked sulfide lenses in a single hole, which show evidence of base metal zoning and further support our interpretation that Selena hosts a multi-phase CRD system with significant growth potential."Mr. Peters continues "We are still in the early days of a new discovery but with individual samples grading up to 27% zinc and 379 g/t silver, we believe Selena has the potential to deliver even higher grades as we continue to vector into the core of the CRD system. Follow up drillhole SE25-054 is in progress with assay results to be released as they are received in 2026." SE25-053 Highlights1.1m grading 27.0% Zn, 60.1 g/t Ag, 0.7% Pb, 1.5 g/t Au, 0.4% Cu, 0.03% Sb (766.4 g/t AgEq or 31.9% ZnEq) starting at 943m downhole, true thickness unknown (Figure 2)And: 17.4 meters grading 6.0% Zn, 35.6 g/t Ag, 0.5% Pb, 0.2 g/t Au, 0.1% Cu, 0.1% Sb (219.9 g/t AgEq or 9.2% ZnEq) (Figure 2 & Picture 2)Including: 8.6 meters grading 10.4% Zn, 21.1 g/t Ag, 0.3% Pb, 0.1 g/t Au, 0.1% Cu, 0.1% Sb (273.6 g/t AgEq or 11.4% ZnEq) (see November 4, 2025 press release HERE) (Table 1)And: 8.7 meters grading 7.0% Zn, 13.9 g/t Ag, 0.3% Pb, 0.1 g/t Au, 0.1% Cu, 0.01% Sb (175.5 g/t AgEq or 7.3% ZnEq) (Picture 1)Picture 1: Representative core photos of the 8.7m thick "lower" sulfide zone in SE25-053 To view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/7298/278452_0033246494762901_001full.jpgDrillhole SE25-053 is the second of the Company's three-hole maiden drill program testing the Chinchilla Sulfide target and represents a new CRD discovery. Hole SE25-054 is in progress and represents a roughly 700m step-out to the northeast of hole SE25-053 to test the extension of the same kilometer-scale MT conductive anomaly (Figure 1). Picture 2: Representative core photos of the 17.4m thick "Upper" sulfide zone in SE25-053 To view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/7298/278452_0033246494762901_002full.jpgFigure 1: Plan view map showing the Chinchilla Sulfide CRD discovery in hole SE25-053 at the southern end of a kilometer-scale MT anomaly (coloured contours) that outlines the Chinchilla Sulfide targetTo view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/7298/278452_0033246494762901_003full.jpgTable 1: Table of significant drill assays for SE25-052A and SE25-053For a collar table click HERE and for a complete table of Selena assay results click HERETo view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/7298/278452_table.jpgFigure 2: Simplified Long-Section A-A' showing the high-grade SE25-053 discovery click HERE to view simplified X-Section B-B' looking eastTo view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/7298/278452_0033246494762901_005full.jpgThe Project is currently operated by Ridgeline under Phase 1 of an earn-in agreement with a wholly owned subsidiary of South32 Limited ("South32"), where South32 may earn up to an 80% interest in the Project by satisfying all commitments under the earn-in agreement (see August 22, 2024 news release HERE). Earn-In Terms – South32 retains the right to earn an initial 60% interest in the Selena project (see August 22, 2024, press release HERE) by funding a minimum of US$10 million in qualifying work expenditures on the Project over an initial five-year term, following which South32 will have a further option to increase its interest in the Project to a total of 80% by funding an additional US$10 million in qualifying work expenditures (for an aggregate spend of US$20 million) over an additional three-year term. If South32 wishes to exercise the Phase 2 option, it must arrange for and provide draft definitive documentation in respect of a debt facility from which (if executed) Ridgeline may draw on to sufficiently fund Ridgeline's share of costs (20% pro-rata) associated with development of a mine at Selena thr