A.I.-Assisted Infill Drilling Intersects 2.61 g/t Au over 13.65 m at STLLR Gold’s Tower Gold Project

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A.I.-Assisted Infill Drilling Intersects 2.61 g/t Au over 13.65 m at STLLR

Gold’s Tower Gold Project

TORONTO, ONTARIO, June 4, 2025 – STLLR Gold Inc. (TSX: STLR) (OTCQX: STLRF) (FSE: O9D) (“STLLR” or

the “Company”) is pleased to announce the remaining infill drilling results using artificial intelligence

technology (“AI”) at the Company’s Tower Gold Project (“Tower”) in the Timmins Mining Camp in Ontario,

Canada.

Table 1: 2025 Tower Infill Drilling Highlights – 903 and 55 Zone Deposits (For more information see Tables

2 & 3 and Figures 1-5):

Zone Hole ID Assay Result

903 MGA25-237

2.61 g/t Au over 13.65 m (10.39 m TT)

including 3.42 g/t Au over 2.80 m (2.13 m TT)

including 5.30 g/t Au over 3.90 m (2.97 m TT)

903 MGA25-240

1.42 g/t Au over 11.15 m (7.27 m TT)

Including 2.77 g/t Au over 2.30 m (1.50 m TT) and

1.33 g/t Au over 17.00 m (11.10 m TT)

Including 1.85 g/t Au over 9.50 m (6.20 m TT)

903 MGA25-239 1.67 g/t Au over 10.85 m (7.75 m TT)

Including 2.36 g/t Au over 4.50 m (3.21 m TT)

55 MGA25-542 2.18 g/t Au over 8.00 m (7.22 m TT)

including 4.33 g/t Au over 3.40 m (3.07 m TT)

Grams per tonne gold (“g/t Au”); Metres (“m”); True thickness (“TT”)

Keyvan Salehi, P.Eng., MBA, President, CEO, and Director of STLLR, commented:

“Our infill drilling program continues to validate the enhanced block model introduced in the Tower 2025

MRE1. The latest results reaffirm near-surface mineralization with strong potential for resource conversion

to higher-confidence categories. Notably, several holes intersected grades above the average open pit

grade defined in the 2025 MRE, underscoring the upside potential within existing pit shells.

In parallel, we have completed a series of technical drill holes to support our advancing Pre-Feasibility

Study work programs. This includes eight geotechnical holes across the broader Tower deposit areas to

1 For more information on the Tower Mineral Resource Estimate (“2025 MRE”) and Preliminary Economic Assessment (“2025 PEA”), please review

the May 15, 2025 STLLR news release on SEDAR+ www.sedarplus.ca or the Company website at www.stllrgold.com. An NI 43-101 Technical Report

will be filed for the 2025 MRE and 2025 PEA on or before June 30, 2025.

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inform slope design, overburden characterization, and overall geotechnical modelling, as well as three

metallurgical holes in the Golden Highway area to support ongoing process optimization and recovery

modelling. These efforts are foundational to de-risking the Project and refining our conceptual mine plan.

In addition to today’s positive results from the 903 and 55 Zone deposits, we also look forward to reporting

on assay results from the Hollinger Tailings Project characterization program in the near future.”

903 Zone and 55 Zone Infill Drilling

The 903 Deposit, part of the Garrison Area at Tower, features gold mineralization linked to quartz veining

within syenites hosted in highly deformed, carbonatized ultramafic volcanics of the Kidd-Munro

assemblage. It lies along the Destor-Porcupine Fault Zone (“DPFZ”), with meta-sediments of the Porcupine

assemblage located to the north.

The 55 Zone Deposit, located on the western end of the Golden Highway Area at Tower, is characterized

by higher-grade, open-pit mineralization that remains open along strike to the southwest. Mineralization at

the 55 Zone Deposit is associated with the Timiskaming age clastic sediment hosted stacked quartz veins

located immediately south of the regional Banded Iron Formation and the DPFZ.

Using AI to optimize drill meterage and mineral resource conversion, STLLR’s infill program intersected

near-surface mineralization with grades higher than the current 903 and 55 Zone Deposits 2025 MRE

open-pit mineralization1, potentially enhancing confidence in the targeted areas. See Figures 1 to 5 for 903

and 55 Zone Deposit drilling highlights, in plan and section views.

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Figure 1: Tower Gold Project – Drill Location Map1

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Figure 2: 903 Deposit – Infill Drilling Results Map1

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Figure 3: 55 Zone Deposit – Infill Drilling Results Map1

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Figure 4: 55 Zone Deposit – Infill Drilling Cross Section “W-E” Looking North1

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Figure 5: 903 Deposit – Infill Drilling Cross Section “A-B” Looking Northeast1

Table 2: Exploration Drilling Intercepts*

Target Hole ID From (m) To (m) Interval (m)

True

Thickness

(m)

Grade (g/t

Au)

Metal Factor

(g/t Au x m)

903 MGA25-234 134.20 148.90 14.70 10.54 0.44 6.45

903 and 151.40 155.70 4.30 3.09 0.57 2.44

903 and 168.90 170.75 1.85 1.33 0.76 1.41

903 MGA25-235 54.00 67.00 13.00 10.09 0.56 7.29

903 and 77.00 86.00 9.00 7.01 0.34 3.06

903 MGA25-236 125.00 141.00 16.00 10.74 0.86 13.78

903 including 125.00 126.00 1.00 0.67 3.87 3.87

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Target Hole ID From (m) To (m) Interval (m)

True

Thickness

(m)

Grade (g/t

Au)

Metal Factor

(g/t Au x m)

903 and 145.10 154.00 8.90 5.97 0.45 4.02

903 and 168.55 179.30 10.75 7.28 0.32 3.43

903 and 207.35 219.00 11.65 7.96 0.40 4.68

903 and 252.00 259.00 7.00 4.81 0.49 3.45

903 MGA25-237 212.70 226.35 13.65 10.39 2.61 35.62

903 including 214.00 216.80 2.80 2.13 3.42 9.57

903 including 222.45 226.35 3.90 2.97 5.30 20.65

903 and 231.00 241.00 10.00 7.59 1.15 11.46

903 and 251.50 260.40 8.90 6.74 0.36 3.25

903 and 294.90 299.50 4.60 3.48 0.41 1.90

903 and 314.00 316.00 2.00 1.51 0.75 1.51

903 MGA25-238 74.50 81.00 6.50 5.29 0.58 3.80

903 and 85.50 88.50 3.00 2.44 0.96 2.87

903 and 120.00 121.60 1.60 1.31 0.63 1.00

903 MGA25-239 72.35 83.20 10.85 7.75 1.67 18.12

903 including 76.50 81.00 4.50 3.21 2.36 10.63

903 and 102.75 109.00 6.25 4.49 0.38 2.36

903 MGA25-240 103.00 111.00 8.00 5.34 0.64 5.09

903 and 195.00 206.15 11.15 7.27 1.42 15.83

903 including 196.90 199.20 2.30 1.50 2.77 6.37

903 and 213.50 221.50 8.00 5.22 0.33 2.65

903 and 223.00 228.50 5.50 3.59 0.43 2.34

903 including 227.50 228.50 1.00 0.65 1.02 1.02

903 and 231.00 248.00 17.00 11.10 1.33 22.55

903 including 238.50 248.00 9.50 6.20 1.85 17.58

903 MGA25-242 20.60 29.50 8.90 6.46 0.42 3.78

903 and 50.50 56.50 6.00 4.35 0.74 4.43

903 and 57.50 70.00 12.50 9.07 0.66 8.25

903 and 77.00 81.90 4.90 3.55 3.28 16.06

903 including 80.50 81.90 1.40 1.02 9.83 13.76

JonPol MGA25-247 275.25 278.00 2.75 2.10 0.42 1.17

JonPol and 291.00 302.00 11.00 8.44 0.69 7.55

JonPol including 297.50 300.50 3.00 2.30 1.88 5.64

JonPol and 358.40 363.00 4.60 3.57 0.31 1.41

55 MGH25-542 52.00 54.00 2.00 1.84 0.80 1.61

55 and 58.00 62.00 4.00 3.66 1.22 4.88