*1.33 g/t AuEq (1.29 g/t Au, 0.45 g/t Ag, 0.03 % Cu) over 34 m, 3.08 g/t AuEq (3.04 g/t Au, 0.46 g/t Ag, 0.02 % Cu) over 12 m

Troilus Mining Corp. (TSX: TLG) (OTCQX: CHXMF) (FSE: CM5) is pleased to announce the fifth batch of results from its Z87 optimization drill program at its gold-copper Troilus Project located in north-central Quebec, Canada. The results reported today include eight drill holes totaling 3,195 metres, and form part of the 2026 exploration program outlined in the Company’s March 31, 2026 press release.

The ongoing Z87 optimization program is focused on targeting Inferred material and unsampled material from historic drilling within and around the current Z87 Reserve pit, with the objective of identifying opportunities to improve the mine plan presented in the Company’s Technical Report on September 9^th, 2026.

The current Mineral Resource and Mineral Reserve estimates have an effective date of December 31, 2025, and therefore exclude all results from the 2026 exploration program. The results reported today further demonstrate mineralization in areas that are currently treated as waste or are classified as Inferred in the existing block model, creating potential opportunities for resource conversion, pit and mining sequence optimization, improvements to the strip ratio and mill feed in the early years of operation.

Z87 Intercept Highlights (see Figure 1):

• Hole 87-26-524 intersected 3.08 g/t gold equivalent (“AuEq”) (3.04 g/t Au, 0.46 g/t Ag, 0.02% Cu) over 12 m within a broader interval of 1.33 g/t AuEq (1.29 g/t Au, 0.45 g/t Ag, 0.03 % Cu) over 34 m starting at 207 m downhole from the Z87 hangingwall (Figure 2).
• Hole 87-26-524 also returned 0.78 g/t gold equivalent (“AuEq”) (0.66 g/t Au, 1.06 g/t Ag, 0.08 % Cu) over 131 m, including 1.41 g/t AuEq (1.22 g/t Au, 1.41 g/t Ag, 0.13 % Cu) over 42.4 m starting at 435 m downhole from an area of Inferred material within the Z87 Reserve pit (Figure 2).
• Hole 87-26-536 intersected 1.09 g/t gold equivalent (“AuEq”) (0.88 g/t Au, 3.36 g/t Ag, 0.13 % Cu) over 59.5 m, including 2.32 g/t AuEq (1.92 g/t Au, 7.06 g/t Ag, 0.22 % Cu) over 11 m starting at 485.5 m from an area of inferred material 50 m below the Z87 Reserve pit.
• Hole 87-23-455-EXT26 intersected 0.79 g/t gold equivalent (“AuEq”) (0.61 g/t Au, 1.54 g/t Ag, 0.12 % Cu) over 71 m, including 1.23 g/t AuEq (1.09 g/t Au, 1.90 g/t Ag, 0.09 % Cu) over 21 m starting at 514 m from an area of Inferred material at the base of the Z87 Reserve pit.

Justin Reid, CEO of Troilus, commented, “The Z87 optimization program continues to deliver strong results, reinforcing our belief that significant opportunities remain within and around the current Reserve pit. While our 2026 drilling is not reflected in the Mineral Resource estimate underlying the updated Technical Report published in September, these results will be incorporated into future modelling updates to assess the potential to convert material from waste to ore, reduce the overall strip ratio and provide greater flexibility in future mine plan revisions. We are confident in our existing mine plan, but remain committed to continual improvement and evaluating opportunities to strengthen it.”

Z87 Optimization Program

Z87 was one of two zones previously mined by open pit during the former Troilus operation. Many of the historical drill holes used to define the former mine Reserve were not continuously sampled, leaving intervals of core – in some cases extending for several hundred metres – without assay data. Many of these unsampled intervals are within the Z87 hangingwall.

For the purposes of resource estimation, these unsampled intervals are assigned values equal to one-half of the laboratory detection limit, resulting in significant gaps within the current block model. The ongoing Z87 optimization program is testing whether mineralization extends through these historically unsampled areas, including those currently treated as waste in the mine plan.

The program is also targeting Inferred material within and around the current Z87 Reserve pit to evaluate potential conversion of resources to the Indicated category and possible incorporation into future Mineral Reserve estimates and mine-plan updates.

The results announced today build on earlier 2026 drilling at Z87, including broad intervals encountered in historically unsampled areas of the hangingwall (see press releases dated September 17, August 20, July 7 and June 25, 2026.)

All grades are uncut, and true thicknesses are approximately 75% to 90% of drilled length.

*The NI 43-101 technical report associated with the Mineral Resources and Reserves of the Troilus Project can be found on SEDAR+ at www.sedarplus.ca under the Company’s issuer profile or on the Company’s website at www.troilusmining.com

Figure 1. Plan map with the reported drill hole locations from Z87

 Figure 2. Cross section showing results for drillhole 87-26-524.

Z87 Drilling

Hole 87-26-524 was drilled to target both historically unsampled intervals and Inferred material within the Z87 Reserve pit (see Figures 1 and 2). The hangingwall returned 3.08 g/t AuEq over 12 metres within a broader zone of 1.33 g/t AuEq over 34 metres, while the main zone returned 131 metres grading 0.78 g/t AuEq including 2.06 g/t AuEq over 20 metres, which includes 3.27 g/t AuEq over 5 metres. This hole presents significantly more mineralization in the hangingwall than is in the current resource model (Figure 2). The main zone in this area contains Inferred material, which is not included in the current reserve statement. Only Measured and Indicated Resources are eligible for conversion to Mineral Reserves for the mine plan. This drilling supports the potential upgrade of Inferred material to the Indicated category.

Drillhole 87-26-536 returned 1.09 g/t AuEq over 59.5 metres, including 2.32 g/t AuEq over 11 metres from the main zone of Z87, where the current resource model contains Inferred material. This intercept is approximately 50 metres below the Z87 Reserve pit. There are many instances where the current Reserve pit has Inferred material just below its lower limits. By targeting this material, it could result in a larger overall Reserve pit.

Drillhole 87-23-455-EXT26 returned 0.79 g/t AuEq over 71 metres, including 1.23 g/t AuEq over 21 metres from an area of Inferred material at the base of the Z87 Reserve pit, which may result in an upgrade to the resource classification, reduced strip ratio and potentially an expanded Reserve pit, similar to results presented above.

To date, Troilus has released 47 drill holes totaling 17,716 metres of the now completed Z87 pit optimization program that amounted to approximately 22,800 metres of drilling and includes the targeting of Inferred and unsampled material within and around the Reserve pit shell.

Table 1. Z87 Drill Results

36

0

33

0

37

0

13

0

20

2

29

0

46

3

22

0

16

1

30

0

5

2

23

0

15

1

8

0

11

1

7

0

56

5

23

0

52

0

20

0

18

0

25

3

12

3

15

5

9

1

21

4

3

0

12

1

^{* AuEq = Au grade + 1.3365 * Cu grade + 0.0136 * 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 in Sudbury, Ontario, 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 + 1.3365*Cu +0.0136 Ag, for J Pit AuEq = Au + 1.3618Cu +0.0137 Ag, for SW Pit AuEq = Au + 1.3856Cu +0.01141 Ag, for X22 Pit AuEq = Au + 1.3168Cu +0.0136 *Ag. AuEq was calculated using metal prices of $2,415/oz Au; $4.60/lb Cu and $32.00/oz Ag and recoveries of 84.5% for Au, 86.9% for Ag and 88.1% for Cu in the J pit, 85.9% for Au, 87.6% for Ag and 87.9% for Cu in the 87 pit, 82.1% for Au, 87.1% for Ag and 87.1% for Cu in the SW pit and 85.6 % for Au, 87.0% for Ag and 86.3% for Cu in the X22 pit.

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 technical report completed in September 2026 supports a large-scale 26-year, 50,000-tonne-per-day open-pit mining operation, positioning it as a cornerstone project in North America.