Canstar Launches Geophysics Program to Unlock High-Grade Potential of Historic Buchans Mining District, Announces Total of More than C$550,000 in Warrant Exercise Proceeds, and Provides Corporate Update

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Toronto, Ontario--(Newsfile Corp. - March 3, 2025) - CANSTAR RESOURCES INC. (TSXV: ROX) (OTC Pink: CSRNF) ("Canstar" or "the Company") announces the commencement of a geophysics program aimed at exploring new, high-grade precious and critical metals deposits within the historic Buchans mining district. The program will leverage Abitibi Geophysics' advanced DasVision 3DIP system to refine drilling targets by identifying stockwork zones and related alteration and mineralization consistent with potential Buchans-grade VMS mineralization at depth. Stockwork zones are historically associated with higher-grade massive sulphide lenses in the Buchans area. The survey will build on previous exploration efforts in the Buchans district, including a district-scale SkyTEM survey.

Historic Buchans VMS District

Long recognized as one of the highest-grade Volcanogenic Massive Sulphide (VMS) systems in history, Buchans was mined by ASARCO from the 1920s to the 1980s. Five deposits yielded a total of 16.2 million tonnes with average mill head grades of 14.51% zinc, 7.56% lead, 1.33% copper, 122 g/t silver, and 1.37 g/t gold.

New geological modeling (2024) by Canstar indicates that the Buchans River Formation, the geological host unit for all five historic Buchans Mine deposits, may underly Canstar's entire property at depth. The formation plunges from the historically mined deposits towards Canstar's adjacent Buchans-area claims.

The 2017 SkyTEM electromagnetic survey identified several multi-kilometre geophysical anomalies within Canstar's Buchans claims. The anomaly coincides with an area of low magnetism, indicating a potential alteration zone. A single historic drillhole from the 1970's-located within one of these anomalies-intersected what was described as "stockwork style" mineralization. Stockwork zones typically exhibit a geophysical signature characterized by low magnetism, variable (generally poor to moderate) electrical conductivity, and good chargeability, which is detected by the DasVision system. These characteristics are similar to the geophysical attributes of the stockwork zones of the historic Buchans deposits, suggesting the potential discovery of stockwork and alteration zones associated with Buchans-style VMS deposits.

VMS deposits are among the most extensively studied mineral deposit types and have well-understood architectural characteristics. The historic Buchans mines are an appropriate analogue for new discoveries within the belt. The massive sulphide deposits at Buchans are dominated by non-conductive sphalerite and contain low pyrite content, making them difficult to detect using electromagnetic geophysical techniques. However, the surrounding alteration and stockwork zones are typically much more extensive and contain zoned distributions of pyrite and chalcopyrite, more easily identifiable through induced polarization survey methods.


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