STLLR Gold Intersects 10.10 g/t Au over 5.57 m, 2.55 g/t Au over 19.70 m and 3.37 g/t Au over 14.53 m at the Jonpol Deposit of the Tower Gold Project
Toronto, May 21, 2026 - STLLR Gold Inc. (TSX: STLR) (OTCQX: STLRF) (FSE: O9D) ("STLLR" or the "Company") reports additional assay results from its 2026 drilling program at the Jonpol Deposit ("Jonpol") at the Garrison Property of the Tower Gold Project ("Tower" or the "Project") in the Timmins Mining Camp in Ontario, Canada.
Table 1: 2026 Jonpol Deposit Drilling Highlights:
| Zone | Hole ID | Assay Result |
| Jonpol | MGA26-265 | 10.10 g/t Au (uncut)/6.68 g/t Au (cut) over 5.57 m (3.68 m TT) & 2.55 g/t Au (uncut)/2.35 g/t Au (cut) over 19.70 m (13.01 m TT) (including 20.22 g/t Au (uncut)/18.07 g/t Au (cut) over 1.84 m (1.22 m TT) |
| Jonpol | MGA26-262 | 3.37 g/t Au (uncut)/3.35 g/t Au (cut) over 14.53 m (10.25 m TT) (including 10.60 g/t Au over 0.36 m (0.25 m TT) & 9.10 g/t Au (uncut)/9.03 g/t Au (cut) over 4.55 m (3.21 m TT) |
| Jonpol | MGA26-264 | 2.07 g/t Au over 19.00 m (11.19 m TT) (including 12.11 g/t Au over 2.25 m (1.33 m TT)) & 1.85 g/t Au over 18.00 m (10.53 m TT) |
| "g/t Au" = grams per tonne gold; "m" = metres; "TT" = True Thickness | ||
"We continue to deliver high-grade, near-surface results at Jonpol, demonstrating its upside potential as a significant value-driver for the Tower Gold Project," said Keyvan Salehi, P.Eng., MBA, President, CEO, and Director of STLLR. "The drill data we have gathered this year suggests Jonpol's open-pit strike extension towards 1,200 meters at potentially above-average grades. More importantly, higher open-pit grades at Jonpol have the ability to enhance Tower's production profile and overall economics."
Jonpol Deposit Drilling (See Figures 1-5 for Diagrams; See Tables 1-3 for Assays and Drill Details)
The Jonpol Deposit is situated in the Garrison Property at the eastern end of Tower (see Figure 1) along the Munro Fault, a splay from the regional Destor-Porcupine Fault Zone ("DPFZ"). Mineralization is hosted in structurally controlled alteration zones within mafic to ultramafic rocks and gold mineralization is closely associated with felsic intrusive rocks.
The 2026 drill program, with an estimated 8,000 m of planned drilling in the first half of the year (STLLR is currently finalizing plans for the second half of the year), is designed to deliver on two primary objectives:
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Strike Extension: majority of the 2026 meterage targets the western extension of Jonpol's open-pit mineralization. Successful results here could expand the strike from 400 m as currently defined in the Tower Preliminary Economic Assessment ("Tower PEA")[1] to approximately 1,200 m. Jonpol remains open along strike and at depth.
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Infill and De-risking: the drill program is also designed to confirm the block model and support the potential expansion of higher-grade mineralization to incorporate into the Tower Mineral Resource Estimate ("Tower MRE")1.
These additional assays continued to intersect near-surface, high-grade mineralization (see Table 1) in targeted areas along the western strike extension. Notably, these results yielded grades exceeding the current average open-pit grades at Jonpol in the Tower MRE, suggesting the potential to expand the mineral resources. These results continue to confirm the current geological model, supporting the potential expansion of higher-grade mineralization.
Figure 1: Tower Gold Project - Drill Location Map
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Figure 2: Jonpol Deposit - Drilling Results Map
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Figure 3: Jonpol Deposit - Drilling Cross Section "A-B" Looking Northeast
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Figure 4: Jonpol Deposit - Drilling Cross Section "C-D" Looking Northeast
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Figure 5: Jonpol Deposit - Drilling Cross Section "E-F" Looking Northeast
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Table 2: Drilling Intercepts
| Target | Hole ID | From (m) | To (m) | Interval (m) | TT (m) | Grade (g/t Au) | Metal Factor (g/t Au x m) |
| Jonpol | MGA26-259 | 60.00 | 61.40 | 1.40 | 0.85 | 0.99 | 1.38 |
| Jonpol | and | 83.65 | 91.40 | 7.75 | 4.69 | 1.10 | 8.49 |
| Jonpol | MGA26-260 | 130.00 | 139.55 | 9.55 | 5.51 | 0.92 | 8.81 |
| Jonpol | and | 141.00 | 159.00 | 18.00 | 10.40 | 0.50 | 9.00 |
| Jonpol | MGA26-261 | 115.00 | 117.00 | 2.00 | 1.17 | 1.50 | 3.00 |
| Jonpol | and | 121.00 | 130.00 | 9.00 | 5.29 | 0.47 | 4.23 |
| Jonpol | and | 134.00 | 146.00 | 12.00 | 7.13 | 1.31 | 15.71 |
| Jonpol | incl. | 140.00 | 142.00 | 2.00 | 1.19 | 5.67 | 11.33 |
| Jonpol | MGA26-262 | 91.30 | 108.62 | 17.32 | 12.27 | 0.62 | 10.67 |
| Jonpol | and | 132.85 | 134.78 | 1.93 | 1.37 | 0.52 | 1.00 |
| Jonpol | and | 147.70 | 162.23 | 14.53 | 10.25 | 3.35 | 48.61 |
| Jonpol | uncut | 147.70 | 162.23 | 14.53 | 10.25 | 3.37 | 48.94 |
| Jonpol | incl. | 148.52 | 148.88 | 0.36 | 0.25 | 10.60 | 3.82 |
| Jonpol | incl. | 157.30 | 161.85 | 4.55 | 3.21 | 9.03 | 41.08 |
| Jonpol | uncut incl. | 157.30 | 161.85 | 4.55 | 3.21 | 9.10 | 41.41 |
| Jonpol | and | 185.40 | 189.22 | 3.82 | 2.70 | 0.39 | 1.48 |
| Jonpol | MGA26-263 | 11.41 | 21.20 | 9.79 | 7.52 | 2.03 | 19.91 |
| Jonpol | incl. | 11.41 | 12.48 | 1.07 | 0.82 | 5.61 | 6.00 |
| Jonpol | and | 26.40 | 32.35 | 5.95 | 4.58 | 2.96 | 17.60 |
| Jonpol | incl. | 30.50 | 32.35 | 1.85 | 1.42 | 7.61 | 14.07 |
| Jonpol | and | 52.28 | 56.12 | 3.84 | 2.96 | 1.28 | 4.90 |
| Jonpol | and | 70.25 | 83.00 | 12.75 | 9.91 | 1.48 | 18.89 |
| Jonpol | incl. | 79.93 | 80.48 | 0.55 | 0.43 | 11.25 | 6.19 |
| Jonpol | MGA26-264 | 52.00 | 71.00 | 19.00 | 11.19 | 2.07 | 39.32 |
| Jonpol | incl. | 65.00 | 67.25 | 2.25 | 1.33 | 12.11 | 27.25 |
| Jonpol | and | 73.00 | 78.65 | 5.65 | 3.33 | 0.54 | 3.05 |
| Jonpol | and | 96.00 | 114.00 | 18.00 | 10.53 | 1.85 | 33.28 |
| Jonpol | incl. | 100.00 | 101.00 | 1.00 | 0.59 | 8.78 | 8.78 |
| Jonpol | incl. | 109.60 | 111.00 | 1.40 | 0.82 | 9.87 | 13.82 |
| Jonpol | MGA26-265 | 71.25 | 78.05 | 6.80 | 4.48 | 0.35 | 2.41 |
| Jonpol | and | 182.15 | 187.72 | 5.57 | 3.68 | 6.68 | 37.20 |
| Jonpol | uncut | 182.15 | 187.72 | 5.57 | 3.68 | 10.10 | 56.28 |
| Jonpol | and | 193.50 | 213.20 | 19.70 | 13.01 | 2.35 | 46.24 |
| Jonpol | uncut | 193.50 | 213.20 | 19.70 | 13.01 | 2.55 | 50.19 |
| Jonpol | incl. | 210.75 | 212.59 | 1.84 | 1.22 | 18.07 | 33.25 |
| Jonpol | uncut incl. | 210.75 | 212.59 | 1.84 | 1.22 | 20.22 | 37.20 |
| Jonpol | and | 238.95 | 239.65 | 0.70 | 0.46 | 2.91 | 2.04 |
Table 3: Drill Hole Details
| Zone | Hole ID | Easting | Northing | Elevation | Azimuth | Inclin. | Depth (m) | ||
| Jonpol | MGA26-259 | 577701.19 | 5374197.63 | 283.46 | 340.01 | -52.08 | 201.00 | ||
| Jonpol | MGA26-260 | 577707.86 | 5374177.56 | 283.46 | 340.01 | -54.98 | 222.00 | ||
| Jonpol | MGA26-261 | 577690.01 | 5374174.54 | 283.23 | 340.18 | -55.09 | 150.00 | ||
| Jonpol | MGA26-262 | 577642.92 | 5374140.06 | 284.19 | 337.88 | -48.08 | 250.25 | ||
| Jonpol | MGA26-263 | 577377.47 | 5374051.56 | 297.87 | 339.03 | -45.05 | 135.00 | ||
| Jonpol | MGA26-264 | 577382.90 | 5374028.27 | 298.76 | 340.11 | -60.10 | 186.00 | ||
| Jonpol | MGA26-265 | 577410.79 | 5373969.62 | 292.26 | 339.00 | -55.05 | 279.00 | ||
Quality Control Procedures
NQ drill core is oriented and cut with half sent to ALS Laboratories Inc. (ALS) for drying and crushing to -2 mm, with a 1.00 kg split pulverized to -75 µm (200#). ALS is an ISO 17025 accredited laboratory. A 50 g charge is Fire Assayed and analyzed using an AAS finish for Gold. Samples above 10.00 g/t Au are analyzed by Fire Assay with a gravimetric finish and selected samples with visible gold or high-grade mineralization are assayed by Metallic Screen Fire Assay on a 1.00 kg sample. STLLR inserts independent certified reference material and blanks with the samples and assays routine pulp repeats, as well as completing routine third-party check assays.
True thickness ("TT") was calculated in Leapfrog Geo, perpendicular to the interpreted plane of mineralization using the dip and dip azimuth of the mineralized zones. All intercepts are calculated using a 0.30 g/t Au cut-off, a maximum of 5 m internal dilution and 25 g/t Au cap applied.
Qualified Person
John McBride, MSc., P.Geo., Vice President of Exploration for STLLR, who is the "Qualified Person" as defined by NI 43-101 for this Project, has reviewed and approved of the technical disclosure contained in this news release.
About STLLR Gold
STLLR Gold Inc. is a Canadian gold development company actively advancing high-potential gold projects in Canada: The Tower Gold Project and the Hollinger Tailings Project in the Timmins Mining Camp in Ontario and the Colomac Gold Project located north of Yellowknife, Northwest Territories. Tower and Colomac have the potential to become large-scale, long-life operations and are surrounded by exploration land with favourable upside potential. Hollinger has the potential for near-term value creation. STLLR's experienced management team, with a track record of successfully advancing projects and operating mines, is working towards rapidly advancing these projects.
Contact Us
STLLR Gold Investor Relations
+1 (416) 863-2105 | investors@stllrgold.com | www.STLLRgold.com
Forward-Looking Information
This news release contains "forward-looking information" within the meaning of applicable Canadian securities legislation. Forward-looking information includes, but is not limited to the large-scale, long-life potential advancement of Tower and Colomac, the value potential of Hollinger, and economic opportunities that are derived from future exploration at the Tower Gold Project, the expansion of resources (including higher than average resource grades) and the increase in confidence in the block model of the Tower MRE, the enhancement of the production profile and economics of Tower, and Jonpol as the value driver and "game-changer" impact on Tower. Generally, forward-looking information can be identified by the use of forward-looking terminology such as "accelerate", "add" or "additional", "advancing", "anticipates" or "does not anticipate", "appears", "believes", "can be", "conceptual", "confidence", "continue", "convert" or "conversion", "deliver", "demonstrating", "estimates", "encouraging", "expand" or "expanding" or "expansion", "expect" or "expectations", "fast-track", "forecasts", "forward", "goal", "improves", "increase", "intends", "justification", "leading", "plans", "potential" or "potentially", "pro-forma", "promise", "prospective", "prioritize", "reflects", "re-rating", "robust", "scheduled", "stronger", "suggesting" or "suggests", "support", "updating", "upside", "will be" or "will consider", "work towards", or variations of such words and phrases or state that certain actions, events or results "may", "could", "would", "might", or "will be taken", "occur", or "be achieved".
Forward-looking information is based on the opinions and estimates of management at the date the information is made, and is based on a number of assumptions and is subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of STLLR to be materially different from those expressed or implied by such forward-looking information, including risks associated with required regulatory approvals, the exploration, development and mining such as economic factors as they effect exploration, future commodity prices, changes in foreign exchange and interest rates, global inflationary pressures, actual results of current exploration activities, government regulation, political or economic developments, the ongoing wars and their effect on supply chains, tariffs, environmental risks, pandemic risks, permitting timelines, capex, operating or technical difficulties in connection with development activities, employee relations, the speculative nature of gold exploration and development, including the risks of diminishing quantities of grades of reserves, contests over title to properties, and changes in project parameters as plans continue to be refined as well as those risk factors discussed in the Company's Annual Information Form for the year ended December 31, 2025, available on www.sedarplus.ca. Although STLLR has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such information. Accordingly, readers should not place undue reliance on forward-looking information. STLLR does not undertake to update any forward-looking information, except in accordance with applicable securities laws.
[1] For more information on the Tower PEA and Tower MRE, please review the NI 43-101 Technical Report with an issue date of June 30, 2025 titled "Preliminary Economic Assessment NI 43-101 Technical Report Tower Gold Project Ontario, Canada" on SEDAR+ www.sedarplus.ca or the Company website at www.stllrgold.com.
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