Canstar Resources intercepts 15.6 m at 2.3% CuEq at Mary March

All Four Phase 1 Holes Intersect Mineralization

Toronto, Ontario--(Newsfile Corp. - August 27, 2026) - Canstar Resources Inc. (TSXV: ROX) (OTCID: CSRNF) ("Canstar" or the "Company") today reported results from the first phase of its 2026 drill program, including the widest massive sulphide intercept in the drilling record of its Mary March Project in the Buchans district of central Newfoundland: 15.6 metres ("m") grading 2.3% copper equivalent ("CuEq")¹ starting at a downhole depth of 467.4 m in drill hole MM-26-42, including 9.75 m at 3.3% CuEq¹. The reported interval is a downhole length through fault-bounded massive sulphide (rock logged at greater than 50% sulphide minerals) hosted by a rhyolite flow-dome, designated the Fleetway Rhyolite; its full width was not intersected. The mineralization remains open along strike and at depth.

All four holes of the 2026 summer drill program intersected visually logged mineralization typical of a volcanogenic massive sulphide ("VMS") system, close to the depths anticipated by the Company's geological model, which will guide the placement of future drill holes. Drill holes MM-26-41, MM-26-43 and MM-26-44 were the first to pierce the full thickness of the Fleetway Rhyolite, with apparent thickness ranging from 298 to 320 m. Across the program, massive sulphide was intersected in two holes (the second visually logged, with assays pending²), and most of the host unit remains untested.

As announced on July 21, 2026, earn-in partner VMS Mining Corporation ("VMSC") invested an additional $2.0 million ahead of schedule, bringing total funding to $4.0 million to date, including $3.5 million in 2026. VMSC's advance funds a planned fall drill campaign, which remains subject to drill-rig availability and other operational considerations. The program follows more than a year of systematic targeting work l