Star Copper Concludes Drill Season with Strong Balance Sheet and Momentum into 2026

Company closes both LIFE and Flow Through Private Placements

Vancouver, British Columbia / December 9, 2025 / Star Copper Corp. (CSE: STCU) (OTCQX: STCUF) (FWB: SOP) (“Star Copper” or the “Company”), a critical minerals exploration and development company is pleased to provide a year-end summary of activities and accomplishments in addition to guidance regarding expectations for the 2026 exploration season.

Highlights

• Raise of over $17 MM
• Drilled 4900m in 2 phases, tested 2 new targets
• 11 holes still pending at assay labs
• First 3 holes released (see Phase 1 Highlights)
• Permit extended to 2028
• Work camp and airstrip remediation completed

Achievements in 2025 were initially based upon extensive records representing $10 million in historic drilling. The recently concluded campaign successfully tested both the lateral and vertical continuity of previously identified mineralized zones along with extensive area-wide field work including mapping, soil and rock sampling. The combined results significantly extend overall geochemical and geophysical knowledge and provide important guidance for the upcoming 2026 season.

Company CEO, Daryl Jones notes, “Building off strong fundamentals, we raised over $17 million to fund a clear set of exploration objectives. Our technical team effectively reprocessed existing geophysical data to produce 3D magnetic inversion models, which produced a nested porphyry model, which in turn guided 4,900 meters of targeted drilling across two preplanned phases. A total of 13 holes were drilled, which expanded the Star Main supergene oxidized deposit to roughly 500 meters x 550 meters x 100 meters deep,  demonstrated a consistent transition from supergene to hypogene mineralization below 200 meters, verified that mineralization is still open below depths of at least 500 meters, and perhaps most importantly, significantly expanded the known areas of mineralization in multiple directions up to 2.5 kilometers from the Star Main asset onwards to our Copper Creek and Star North project areas. The Company then capped off 2025 with another progressive financing which positions the Company to exit 2025 with nearly $10 million in cash on the balance sheet. All this activity packed into one exploration season truly sets the stage for an exciting year ahead.”

“Looking forward to 2026,” Jones continues, “the Company is planning on strengthening and delineating existing Star asset models with detailed 3D geophysical data studies to provide greater, and more accurate comprehensive analysis with the incorporation of all assay results including from pending assays from as-yet unreported holes drilled in 2025, and by attracting specialized technical and operational talent to increase and improve our ability to effectively manage the growth focused scope of the project.”

Phase 1 Drill Campaign Summary (to-date)

Phase 1 drilling expanded the near-surface supergene footprint to the west and southwest, confirmed copper mineralization across multiple intrusive phases, and sharpened the structural and alteration framework—particularly along the Star Fault and associated potassic (K-feldspar) alteration corridors. The six-hole drill campaign (S-050, S-051, S-052, S-053B, S-054A, S-055) totaled over 2200m and culminated with Hole S-055 (2025-E), which intersected a near-surface oxide horizon (visible malachite and azurite) transitioning at depth to chalcopyrite in mineralized quartz monzodiorite, consistent with our oxide-to-hypogene model along major structures. With assay results still pending, the Company will take the winter months to refine the geologic model to further advance future drilling on Star.  Assays results for the initial three drillholes have been completed (see news releases September 22, 2025, and September 30, 2025), with  assays pending for holes S-503B, S-054A, and S-055.

Figure 1-2025 Drill Collar Locations. Star Copper 2025

Table 1 – 2025 Drill Holes

Target	Hole_ID	Easting	Northing	Elevation	Azimuth	Dip	Total Depth
Star Main	S_050	339836.6	6458308	1132.305	270	-85	101
Star Main	S_051	339766.1	6458303	1121.538	235	-85	539
Star Main	S_052	339857.6	6458405	1155.584	240	-83	674
Star Main	S-053B	339723.9	6458250	1103.396	260	-83	183
Star Main	S-055	339786.9	6458116	1045.055	270	-85	330.5
Star Main	S-054A	339992.1	6458294	1123.932	270	-85	413
Star Main	S-056	339693.4	6458145	1051.331	0	-75	551
Star Main	S-057	339693.4	6458145	1051.331	0	-88	511.25
Star Main	S-058	339704.1	6458491	1166.101	0	-90	276
Star Main	S-059	339865.2	6458454	1164.337	180	-80	317
Star Main	S-060	339928.5	6458218	1118.994	265	-85	322
Star Main	S-061	339556	6457956	941.41	320	-65	74
Copper Creek	CC-25-001	341181	6456422	901	262	-45	151
Star North	SN-25-001	340487	6459084	1163	131	-45	402

UTM Zone 9N

Highlights from Phase 1

• Hole S-051 intersected 226.54m 0.70% CuEq (0.44% Cu & 0.25 g/t Au) from 14m.
  • Including 90m of 1.13% CuEq (0.65% Cu & 0.47 g/t Au) from 14m.
  • Including 40m of 1.73% CuEq (1.03% Cu & 0.68 g/t Au) from 34m.
• Hole S-050 intersected 93m 0.93% CuEq (0.56% Cu & 0.36 g/t Au) from 8m.
• Hole S-052 intersected 397m of 0.37% CuEq (0.25% Cu & 0.11 g/t Au) from 29m.
  • Including 228m of 0.51% CuEq (0.34% Cu & 0.17 g/t Au) from 17m.
  • Including 90.95m of 0.75 CuEq (0.51% Cu & 0.23 g/t Au) from 29m.

Samples from the Phase 1 program have all been shipped to the laboratory, and results will be reported once received and reviewed under our QA/QC protocols. The supergene zone continues to deliver the most exciting early visuals, giving confidence that this could be a potentially large oxide footprint (See inset photo Figures 2 & 3). With the Star project holding vast potential in the supergene zone, the Company is extremely excited about the hypogene mineralization which continues northwest and southeast of the supergene with a footprint of 1 km long by 500 m wide. The hypogene system also extends well below the 100m depth to well over 400m as reported in the first 3 holes from Phase 1.

 

Figure 2-Supergene mineralization in S-051 42.0-42.26m. Star Copper 2025

Figure 3-Azurite and malachite mineralization in lower trench beside collar of S-061
as 20 cm long angular subcrop. Star Copper 2025.

Phase 2 Drill Campaign Summary (to date)

Phase 2 wrapped up mid-November with a total of 2,700 m spread over the Star Main deposit, Star North and Copper Creek targets. The drilling was successful in confirming that both Star North and Copper Creek showed valuable visible chalcopyrite and strong mineralization that will be followed up in 2026 drilling (see Figure 5).

Star Main drilling in Phase 2 centered around the relationship between supergene to hypogene transition and the structures that carry the mineralization. Copper Creek is a historically drilled target 2.2 km Southeast of the Star Main deposit and has a very strong soil signature associated with a coincident chargeability high similar to Star Main. One hole was drilled to a depth of 120 m and intersected strong VMS mineralization over a broad intercept at the target depth. Star North, which is another strong soil anomaly and coincidental chargeability high, located 1 km northeast of the Star Main saw 400m of drilling to test the structure to allow for further drilling to expand the target in 2026. Star Main also saw additional follow up drilling during phase 2 to confirm the hypogene mineralization and expand the overall deposit model. A total of 13 holes were drilled at Star Main with 11 assays still pending.

Figure 4-Star Project Overview. Star Copper 2025.

Figure 5-Copper Creek Mineralization at 120m (Drill hole CC-25-001). Star Copper 2025.

In Conclusion

The Company is now compiling all relevant work completed in the field in 2025 to better understand the deposit model on Star Main and develop the model for Star North and Copper Creek. With a very successful 2025 drill season concluded, the Company is tremendously excited about the prospects for the 2026 campaign. The Company looks forward to commencing fieldwork early in 2026 to undertake additional drilling, additional 3D geophysics and related data compilation to continue growing our value proposition to meet the expectations of our team members, stakeholders and shareholders as we strive towards affirming Star Copper holds Canada’s next big copper deposit.

Key takeaways

• Robust deposit model showing transition from supergene to hypogene intact
• Mineralization continues to 500m, and open at depth
• Robust drill target pipeline for 2026 field work
• Deep 3D geophysical modelling planned to enhance deposit model
• Assays still pending for 11 holes
• Well-funded to open camp and begin 2026 field season

To find out more, visit our website and watch our videos at https://starcopper.com/media/.

Private Placement Closings

Further to the Company’s announcements of November 20, 2025 and November 25, 2025, the Company is also please to announce the completion of two non-brokered private placements:

Non-Brokered LIFE Private Placement

The Company has completed a non-brokered private placement for gross proceeds of C$3,000,000 from the sale of 3,000,000 units of the Company (each, a “Unit”, and collectively, the “Units”) at a price of C$1.00 per Unit (the “LIFE Offering”) under the Listed Issuer Financing Exemption (as defined herein). Each Unit consists of one common share (each, a “Share” and collectively, the “Shares”) and one common share purchase warrant (each a “Warrant” and collectively, the “Warrants”). Each Warrant is exercisable to acquire one common share (each a “Warrant Share”, and collectively, the “Warrant Shares”) at a price of $1.20 per Warrant Share for a period of 24 months from the date hereof (the “Closing Date”). The Warrants are not listed for trading on any stock exchange.