Troilus Mining Corp. (TSX: TLG) (OTCQX: CHXMF) ( FSE: CM5R) is pleased to announce additional drill results from the West Rim Zone 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):

• Hole WR-26-013 intersected 6.93 g/t gold equivalent (6.91 g/t Au, 0.97g/t Ag, 0.00 % Cu) over 18.5 m, including 19.06 g/t AuEQ (19.03 g/t Au, 1.76 g/t Ag, 0.00 % Cu) over 6.4 m, which includes 53.90 g/t AuEQ (53.85 g/t Au, 4.29 g/t Ag, 0.00 % Cu) over 2 m, starting at just 11.5 m downhole.
• Hole WR-26-014 intersected 1.80 g/t gold equivalent (1.75 g/t Au, 2.64 g/t Ag, 0.01 % Cu) over 23.85 m, including 3.82 g/t AuEQ (3.77 g/t Au, 4.09 g/t Ag, 0.00 % Cu) over 9.8 m, which includes 6.81 g/t AuEQ (6.71 g.t Au, 7.73 g/t Ag, 0.01 % Cu) over 5 m, starting at just 19.25 m downhole.
• Hole WR-26-015 intersected 1.58 g/t gold equivalent (1.56 g/t Au, 0.92 g/t Ag, 0.01 % Cu) over 13.5 m, including 16.23 g/t AuEQ (16.20 g/t Au, 2.10 g/t Ag, 0.00 % Cu) over 0.6 m starting at 113.5 m downhole.

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.sedarplus.ca under the Company’s issuer profile or on the Company’s website at www.troilusgold.com}

West Rim Drilling

Drillhole WR-26-013 returned 6.93 g/t AuEQ over 18.5 metres, including 19.06 g/t AuEQ over 6.4 metres, while drillhole WR-26-14 returned 1.80 g/t AuEQ over 23.85 metres, including 6.81 g/t over 5 metres from the main West Rim trend. These intercepts begin at shallow downhole depths of just 11.5 metres and 19.25 metres, respectively, and are located approximately 100 metres apart along strike.

Together, these intercepts define a continuous high-grade corridor near surface and represent some of the strongest near-pit grade-thickness results drilled to date at Troilus. The mineralization remains open along strike and at depth.

The main West Rim trend extends an additional 170 metres to the north where drillhole WR-26-016 returned 2.92 g/t AuEQ over 19 metres including 7.82 g/t AuEQ over 5 metres (see May 19, 2026 press release). Mineralization presents as layered bands of semi-massive pyrite and pyrrhotite with enrichment in gold and silver. There is little to no copper contributing to the gold equivalent formula.

Further down dip, drillhole WR-26-015 returned 1.58 g/t AuEQ over 13.5 metres including 16.23 g/t AuEQ over 0.6 metres beginning at 113.5 metres downhole. This intercept is located approximately 100 metres down dip from the original discovery hole X22-24-080 (see May 30, 2024 press release), which returned 1.37 g/t AuEQ over 11 metres within a broader zone of 0.74 g/t AuEQ over 32 metres, and continues to demonstrate the continuity of high-grade mineralization at depth within the system.

Next Steps

All results are being incorporated into the evolving geological and structural model for West Rim, with planning underway for an expanded Phase 2 drill campaign.

The results released to date represent approximately half of the 3,000 metres budgeted for West Rim in 2026. Given the success of the initial drilling campaign, the Company expects to continue both infill and expansion drilling along the known mineralized trend while also testing the broader West Rim corridor, which remains largely underexplored along its interpreted five-kilometre prospective strike length.

Upcoming work is expected to include additional drilling, structural interpretation, and trial geophysical techniques aimed at improving targeting within the highly deformed sulfide-rich mineralized system.

Figure 1. Plan map with the reported drill hole locations

Table 1. West Rim Drill Results

^{* AuEq = Au grade + 1.5107 * Cu grade + 0.0119 * Ag grade}

Quality Assurance and Control

During the drill program, one meter assay samples were taken from NQ core and sawed in half. One-half was sent for assaying at ALS Laboratory, a certified commercial laboratory, and the other half was retained for results, cross checks, and future reference. A strict QA/QC program was applied to all samples; which included insertion of one certified mineralized standard and one blank sample in each batch of 25 samples. Every sample was processed with standard crushing to 85% passing 75 microns on 500 g splits. Samples were assayed by one-AT (30 g) fire assay with an AA finish and if results were higher than 3.5 g/t Au, assays were redone with a gravimetric finish. For QA/QC samples, a 50 g fire assay was done. In addition to gold, ALS laboratory carried out multi-element analysis for ME-ICP61 analysis of 33 elements four acid ICP-AES.

Qualified Person

The technical and scientific information in this press release has been reviewed and approved by Nicolas Guest, P.Geo., Exploration Manager, who is a Qualified Person as defined by NI 43-101. Mr. Guest is an employee of Troilus and is not independent of the Company under NI 43-101.

AuEq Disclosure

The formulas used to calculate equivalent values for resources are as follows, for 87 Pit AuEq = Au + 1.5628*Cu +0.0128 *Ag, for J Pit AuEq = Au + 1.5107*Cu +0.0119 *Ag, for SW Pit AuEq = Au + 1.6823*Cu +0.0124 *Ag, for X22 Pit AuEq = Au + 1.5628*Cu +0.0128 *Ag. AuEq was calculated using metal prices of $1,850/oz Au; $4.25/lb Cu and $23.00/oz Ag.

About Troilus Mining Corp.

Troilus Mining Corp. is a Canadian development-stage mining company focused on the systematic advancement of the former gold and copper Troilus Mine towards production. Troilus is located in the tier-one mining jurisdiction of Quebec, Canada, where it holds a large land position of 435 km² in the Frôtet-Evans Greenstone Belt. A Feasibility Study completed in May 2024 supports a large-scale 22-year, 50ktpd open-pit mining operation, positioning it as a cornerstone project in North America.