Troilus Continues to Expand High-Grade West Rim Discovery With 19.06 g/t AuEQ Over 6.4 m and 6.81 g/t AuEQ Over 5 m at Surface

About this update from Troilus Mining Corp

MONTREAL, June 11, 2026 (GLOBE NEWSWIRE) -- Troilus Mining Corp. (“Troilus” or the “Company”, TSX: TLG; OTCQX: CHXMF; FSE: CM5R) is pleased to announce additional drill results from the West Rim Zone (“West Rim”) as part of its ongoing 2026 Exploration Program (see March 31, 2026 press release) at its copper-gold Troilus Project located in northcentral Quebec, Canada. The now completed Phase 1 West Rim drill program focused on expanding the mineralized footprint of the West Rim Zone, which was initially discovered in 2024 through near-mine exploration drilling west of the North Reserve Pit (see May 30, 2024 press release). The latest results continue to demonstrate the emergence of a significant high-grade mineralized zone located entirely outside the current mineral resource estimate and within 200 metres of the reserve pit outlined in the Company’s 2024 Feasibility Study (see May 14, 2024 press release). Importantly, the intercepts reported from West Rim compare favourably to some of the highest-grade near-surface intercepts associated with the current reserve pit areas at Troilus while remaining in close proximity to planned mining and infrastructure areas. The results continue to support the potential for both open pit and underground development scenarios at West Rim. All grades are uncut, and true thicknesses are approximately 75% to 90% of drilled length. West Rim Intercept Highlights (see Figure 1): Justin Reid, CEO of Troilus, commented, “West Rim continues to deliver some of the strongest near-surface drill results encountered to date at Troilus, immediately adjacent to our planned reserve pits and entirely outside the current resource estimate. The consistency of high-grade mineralization we are seeing across the trend is particularly encouraging and continues to demonstrate the potential for West Rim to evolve into a meaningful near-mine zone within the broader Troilus Project. Importantly, these latest intercepts continue to outperform the original discovery drilling completed in 2024 while reinforcing the significant exploration upside that remains across the property. With only approximately half of the planned drilling completed to date at West Rim, we believe there remains considerable opportunity for further expansion.” *The completed NI 43-101 technical report associated with the Troilus Project FS can be found on SEDAR+ at www.sedarplu...

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