Sitka Drills 235.9 Metres of 1.11 g/t Gold from Surface, Including 40.0 Metres of 2.01 g/t Gold and 10.0 Metres of 5.29 g/t Gold, Further Confirming a Near-Surface Higher-Grade Gold Zone at Its Rhosgobel Discovery, RC Gold Project, Yukon

NEWS RELEASE

September 18, 2025 NR 25-23

www.sitkagoldcorp.com

SITKA DRILLS 235.9 METRES OF 1.11 G/T GOLD FROM SURFACE, INCLUDING 40.0 METRES OF 2.01 G/T GOLD AND 10.0 METRES OF 5.29 G/T GOLD, FURTHER CONFIRMING A NEAR-SURFACE HIGHER-GRADE GOLD ZONE AT ITS RHOSGOBEL DISCOVERY, RC GOLD PROJECT, YUKON

• DDRCRG-25-010 returned 235.9 m of 1.11 g/t gold, including 40.0 m of 2.01 g/t gold and 10.0 m of 5.29 g/t gold, from surface; the best intercept to date from Rhosgobel
• DDRCRG-25-009 returned 118.0 m of 1.09 g/t gold, including 14.0 m of 3.34 g/t gold, from surface
• Drill results to date confirm continuity of near-surface, higher-grade gold mineralization which remains open in all directions laterally and at depth
• First 10 diamond drill holes completed to date at Rhosgobel have all returned

intercepts of > 100 g*m of gold

• Assays pending for an additional 32 diamond drill holes completed at Rhosgobel across a strike length of approximately 1.2 km
• Numerous instances of visible gold identified in 26 of the remaining 32 drill holes at Rhosgobel
• Significant intercepts of tungsten associated with gold mineralization discovered at Rhosgoebel, including 75.50 m of 0.132% WO3, 6.98 m of 0.388% WO3 and 0.61 m of

4.739% WO3

• A total of 91 diamond drill holes have now been completed at RC Gold this year targeting the Blackjack, Saddle, Eiger, Pukelman, Contact, Rhosgobel, Bear Paw and May-Q targets
• Approximately 32,000 metres completed of a planned 30,000 metre drill program with results still pending for 62 drill holes

VANCOUVER, CANADA – September 18, 2025: Sitka Gold Corp. (“Sitka” or the “Company”) (TSX-V:SIG) (FSE:1RF) (OTCQB:SITKF) is pleased to announce additional analytical results for diamond drill holes completed at the Rhosgobel intrusion target located at its 100% owned, road accessible RC Gold Project (“RC Gold” or the “Project”) within the Yukon’s prolific Tombstone Gold Belt. Results from drill holes RCRG25-009 and 010 have now been received and confirm the consistency of this newly discovered mineralized system where assays from all 10 diamond drill holes completed to date in this area have returned >100 g*m (g/t Au*m) intercepts over a strike length of approximately 300 metres, and where hole 010 reported in this news release returned a 262.6 g*m intercept. DDRCRG-25-010 returned the best intercept to date from Rhosgobel, with 235.9 m of 1.11 g/t gold, including 40.0 m of 2.01 g/t gold and 10.0 m of 5.29 g/t gold, from surface. DDRCRG-25-009 also returned impressive results with an intercept of 118.0 m of 1.09 g/t gold, including 14.0 m of 3.34 g/t gold, also from surface (see Tables 1 and 2). To date a total of 42 drill holes have been completed in 2025 on this newly discovered Rhosgobel area stretching for over 1.2 kms in length. Numerous instances of visible gold have also been identified in 26 of the remaining 32 diamond drill holes completed at Rhosgobel with assays pending (see Figures 2 and 5).

The Company is also pleased to announce that it requested and has subsequently received analytical results for tungsten from DDRCRG-24-002 that indicates the potential for significant tungsten mineralization at the Rhosgobel target, with intercepts of up to 75.50 m of 0.132% WO3, 6.98 m of 0.388% WO3 and 0.61 m of 4.739% WO3 (see Table 3 and Figure 6).

Assays are also pending for an additional 30 diamond drill holes that have been completed across the Blackjack, Saddle, Eiger, Pukelman, Contact, Bear Paw and MayQu targets. Approximately 32,000 metres of diamond drilling has been completed across the RC Gold Project this year.

Table 1: Gold assay highlights for this release (see Table 2 for details)

*Intervals are drilled core length, as insufficient drilling has been completed at this time to determine true widths.

"These latest results confirm the continuity of strong gold values within this newly discovered high-grade mineralized gold zone at Rhosgobel", stated Cor Coe, CEO and Director of Sitka. "Our technical team has done an incredible job bringing this new discovery at Rhosgobel from an initial two diamond drill holes completed late last year to an impressive 42 drill holes totalling over 12,000 metres across a strike length of 1.2 km in just a few short months. While the exceptional, near-surface gold values from Rhosgobel continue to impress, the newly identified tungsten mineralization discovered in this system adds a very compelling component to this target. Given the potential significance that tungsten could have as a by- product of future gold production, we have implemented additional analytical procedures to assay for tungsten at Rhosgobel. With mineralization open in all directions and plenty of room to continue expanding with the drill bit across the 2 km x 1.5 km target area, we believe Rhosgobel has the potential to become our new flagship deposit at RC Gold. We have much to look forward to as we await the remaining drill results still pending for 32 additional holes at Rhosgobel, along with 30 drill holes still pending across the Blackjack, Saddle, Eiger, Pukelman, Contact, Bear Paw and MayQu targets.”

Figure 1: A cross section showing the intercepts of 235.9 m of 1.11 g/t Au, including 40.0 m of 2.01 g/t Au and 10.0 m of 5.29 g/t Au in DDRCRG-25-010 and 118.6 m of 1.09 g/t Au, including 14.0 m of 3.34 g/t Au, in DDRCRG-25-009.

Figure 2: A plan map of the Rhosgobel Intrusion target showing the drilling completed to date in 2025. All holes have intersected reduced intrusion-related gold system (RIRGS) style mineralization including centimetre-scale, sheeted, quartz veins and larger, metre-scale quartz, and quartz-tourmaline veins (and breccias) cutting the feldspar megacrystic quartz monzonite intrusion. Multiple occurrences of visible gold have been observed in most of the diamond drill holes completed to date (yellow stars). Note: logging of holes 40 and 42 are currently in progress.

Figure 3: A plan map of the broader Rhosgobel Intrusion target area that is supported by a large 2.0 km x 1.5 km gold-in-soil anomaly which covers the central part of the intrusion. While drilling to date has only been focused on the core of this target area, geochemical results from soil sampling have been shown to strongly correlate with in situ gold mineralization at Rhosgobel.

Figure 4: An example of drill core from DDRCRG-25-010 showing quartz veins and tourmaline veinlets and tourmaline breccia cutting weakly altered, feldspar megacrystic quartz monzonite of the Rhosgobel intrusion. The displayed section shows most of the 13.2 m interval from 69.1 m containing 4.16 g/t Au.

RHOSGOBEL DRILLING

To date, 43 holes totalling approximately 12,722 m have been completed at Rhosgobel. All holes drilled have intersected significant reduced intrusion-related gold (RIRGS) style mineralization including centimetre-scale, sheeted, quartz veins and larger, metre-scale quartz, and quartz-tourmaline veins (and breccias) cutting the feldspar megacrystic quartz monzonite intrusion. Visible gold has been observed within all styles of veins and is often associated with bismuthinite, scheelite, and molybdenite (see Figure 4). Drilling to date has traced mineralization over a strike length of approximately 1.1 kilometres within a large 2.0 km x 1.5 km surface signature represented by a gold-in-soil anomaly with values up to >500 ppb (Figure 3). Gold mineralization at Rhosgobel begins at surface, extends to a depth of over 400 metres and remains open in all directions. The first ten diamond drill holes, including the two discovery holes drilled in 2024, have all intersected >100 gram-metres gold (g/t Au*m).

• While visible gold observations are very encouraging and confirm the presence of gold mineralization, they are not intended to imply potential gold

grades. Gold assays will be published after they are received from the lab for mineralized intervals in which visible gold particles were noted.

Table 2: Summary of significant assay results from this release

*Intervals are drilled core length, as insufficient drilling has been completed at this time to determine true widths

TUNGSTEN AT RHOSGOBEL

Drill hole DDRCRG-24-002, which intersected 173.3 metres of 0.60 g/t gold from 97.0 metres, including 28.4 metres of 1.40 g/t gold from 105.0 metres, and 12.4 metres of 2.40 g/t gold from 121.0 metres (see news release dated November 25, 2024) was submitted to ALS Laboratories for WO3 analysis via XRF pressed pellet with a Lithium Borate fusion on pulp material.

Tungsten mineralization, primarily as the mineral scheelite, has been observed in many of the drill holes completed to date at Rhosgobel and occurs as coarse (up to 5cm) scheelite crystals within the sub-metre scale quartz, and quartz tourmaline veins and as smaller (0.5-1 cm) crystals with the centimetre-scale sheeted quartz veins (see Figure 5). Narrow zones of high-grade tungsten (6.98 m of 0.39% WO3, and 0.61 m of 4.73 % WO3) are found within broad zones of lower grade tungsten mineralization (75.5 m of 0.132 % WO3, and 46.19 m of 0.121 % WO3). The Company is very encouraged by these initial analytical results, however, additional work is needed to further investigate the nature and distribution of tungsten mineralization and its potential economic significance at Rhosgobel as a by-product of potential gold production.

Table 3: Analytical Results for Tungsten (WO3) mineralization at Rhosgobel (DDRCRG-24- 002)

*Intervals are drilled core length, as insufficient drilling has been completed at this time to determine true widths.

**Larger intervals were calculated using a 0.1 % WO3 Cutoff grade and 20 m waste limit, and narrow intersections were calculated using a 0.5 % WO3 Cut off grade and a 20 m waste limit. Two different tungsten standards, blanks, and duplicates were submitted in regular intervals in the sampling process and all QA/QC procedures were followed.

Figure 5: Example of scheelite (top picture), a common tungsten mineral, illuminated by ultraviolet light with visible gold and bismuthinite (red circles) in a quartz vein in drill core from the Rhosgobel intrusion along with an additional example of visible gold (bottom picture), both observed in DDRCRG-25-042.

Figure 6: Regional map of the RC Gold Project located in the western portion of Yukon’s prolific Tombstone Gold Belt.

Figure 7*: A plan map of the Clear Creek Intrusive Complex (CCIC) showing the updated resource areas at Blackjack and Eiger, and the six additional areas that have drill targets indicated by the mauve hatched areas. The map highlights the numerous drill targets that Sitka has outlined within the CCIC which all are connected by the road network on the project and occur in an area measuring five (5) km north-south and twelve (12) km east-west. Additional areas highlighted by strong gold in soil anomalies are being advanced to the drill ready stage with additional geological work in 2025.

• References for Figure 7 drilling intervals:

Rhosgobel Intervals: Sitka Gold News Release dated November 25, 2024 Pukelman Intervals: Sitka Gold News Release dated January 7, 2025 Contact Intervals: O'Brien, 2010; Assessment Report, 2010 Diamond Drilling Program, Clear Creek Property (Assessment report 095539)

Shutty, 2011; Assessment Report, 2011 Exploration Program, Clear Creek Property (Assessment Report 095984)

Bear Paw Intervals: Shutty, 2011; Assessment Report, 2011 Exploration Program, Clear Creek Property (Assessment Report 095984)

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