Canterra Minerals Corporation (TSX-V: CTM) (OTCQB: CTMCF) (FSE: DXZB) is excited to report new drill results from its ongoing 10,000 metre drill program at its 100% owned Buchans Project, located in Newfoundland’s prolific Central Mining District. The project sits in a proven mining district, just 50 km north of Equinox Gold’s Valentine Gold Mine and 34 km northwest of Teck’s past producing Duck Pond Mine (Figure 4).

Drillhole H-25-3538 Delivers Long, High-Grade Interval ^(1&2):

• 60.70 metres grading 0.85% CuEq (0.39% Cu, 1.00 % Zn, 0.55% Pb, 2.5 g/t Ag & 0.03 g/t Au) from just 15.3 m to 76 m below surface
  • including 4.7 metres of 2.29% CuEq (1.19% Cu, 2.25% Zn, 1.27% Pb, 9.3 g/t Ag & 0.06 g/t Au)
• Broad sulphide stockwork mineralization extends below the current resource, suggesting potential for larger open pit mineral resource
• Results confirm strong copper distribution, an increasingly valuable component of the Lundberg deposit
• The 60.7-metre intersection is one of the longest continuous mineralized intervals drilled on the project to date

Chris Pennimpede, President and CEO of Canterra commented: “We are off to a fantastic start in the 2025 drill season. These latest results show copper-rich mineralization well outside the existing resource area-exactly what we want to see as we aim to grow the Lundberg deposit. Importantly, the existing resource was based on a conservative copper price of just US$3.00/lb, well below today’s much stronger copper market price. With 8,000 metres of drilling still to come this summer and fall, we’re excited about the upside potential at Buchans.”

Table 1. Assay Highlights. Copper Equivalents (CuEq%) as per metal prices of April 11, 2025 (see notes ² & ³ at end of release for additional explanation; holes H-25-3539 and H-25-3537 previously released May20, 2025 and June 3, 2025).

Figure 1. Buchans 2025 drilling collars and assay highlights.

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Figure 2. Cross Section for H-25-3538 (looking west).

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Drill Results Analysis
The latest drill results from hole H-25-3538 further demonstrate the robust and continuous mineralization of the Lundberg deposit. The standout 60.7-metre intersection grading 0.85% copper equivalent, starting just 15.3 metres below surface, is one of the longest mineralized intercepts encountered to date (Figure 2) and highlights the near-surface potential ideal for open-pit development. This builds on the previously announced 68-metre interval of 1.0% copper equivalent from surface in hole H-25-3537 (June 2025), reinforcing a consistent pattern of broad, high-grade mineralization near surface across the deposit (Figure 3).

Figure 3. Cross Section for H-25-3537 previously reported assays (looking west).

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Buchans Project
Canterra’s Buchans Project spans 95 km² near the town of Buchans and hosts both the world-renowned, past-producing Buchans Mine and the undeveloped Lundberg deposit. The historic Buchans Mine, operated by Asarco from 1928 to 1984, was one of the highest-grade base metal producers of its time. Adjacent to this legacy, the Lundberg deposit represents a significant undeveloped VMS resource, characterized by near-surface stockwork sulphide mineralization—well-suited for open-pit development in a proven mining district.

Table 2: Lundberg Deposit Mineral Resource Estimate – Effective Date: February 28, 2019

Figure 4. Canterra’s Central Newfoundland Mining District properties.

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Notes:

⁽¹⁾ Past production figures from Kirkham, R.V., ed., 1987, Buchans Geology, Newfoundland. Geological Survey of Canada, Paper 86-24, 288 p.
⁽²⁾ True widths estimated to be a ~90% of reported core lengths. Copper equivalents (CuEq) based on total contained copper, zinc, lead, silver and gold and metal prices as of April 11, 2025 (Cu – US$4.06/lb, Zn – US$1.19/lb, Pb – US$0.85/lb, Ag – US$32.23/oz and Au – US$3,236.00/oz).
⁽³⁾ Copper Equivalent % = Cu% + ((Pb% * 22.046 * Pb Rec.* Pb price) + (Zn% * 22.046 * Zn Rec. * Zn price) + (Ag g/t/31.10348 * Ag Rec. * Ag price) + (Au g/t/31.10348 * Au Rec. * Au Price))/(Cu Price * 22.046 * Cu Rec.). Metal recoveries are assumed to be 100% (Rec.)
⁽⁴⁾ Lundberg’s 2019 Resource Estimate (effective date of February 28, 2019) includes In-pit Indicated Mineral Resources 16,790,000 tonnes grading of 0.42% Cu, 1.53% Zn, 0.64% Pb, 5.69 g/t Ag & 0.07 g/t Au as well as In-pit Inferred Mineral Resources totaling 380,000 tonnes at a grade of 0.36% Cu, 2.03% Zn, 1.01% Pb, 22.35 g/t Ag & 0.31 g/t Au; see news release dated June 4, 2024 and associated Technical Report for additional details).

Table 2.  Drill collar locations.

Newfoundland and Labrador Junior Exploration Assistance
Canterra would like to acknowledge financial support it may receive from the government of Newfoundland and Labrador’s Junior Exploration Assistance Program related to completion of its 2025 exploration programs at Buchans.

About Canterra Minerals
Canterra is a diversified minerals exploration company focused on critical minerals and gold in central Newfoundland. The Company’s projects include six mineral deposits located in close proximity to the world-renowned, past producing Buchans Mine and Teck Resources’ Duck Pond Mine, which collectively produced copper, zinc, lead, silver and gold. Several of Canterra’s deposits support current and historical Mineral Resource Estimates prepared in accordance with National Instrument 43-101 and the Canadian Institute of Mining, Metallurgy, and Petroleum Definition Standards for Mineral Resources and Mineral Reserves current at their respective effective dates. Canterra’s gold projects are located on-trend of Equinox Gold’s Valentine mine currently under construction and cover a ~60 km extension of the same structural corridor that hosts mineralization within Equinox Gold’s mine project. Past drilling by Canterra and others within the Company’s gold projects intersected multiple occurrences of orogenic-style gold mineralization within a large land position that remains underexplored.

QA/QC Protocols
Samples consist of saw-cut (NQ drill core) with one-half retained for reference and one-half submitted for analyses. Samples were submitted in sealed plastic bags delivered by Canterra personnel to SGS Canada’s preparatory facility in Grand Falls-Windsor, Newfoundland. Sample batches consisted of core samples, control standards, blanks and duplicates. Once prepared, pulps (SGS procedure code PRP89) were shipped to SGS Canada’s laboratory in Burnaby, BC to be homogenized and subsequently analyzed for multi-element assays (including Cu, Pb, Zn, Ag and Au) using sodium peroxide fusion with ICP-OES finish (codes GE_ICP90A50 for Cu, Pb, Zn, Ag, GE_AAS22E50 for Ag by-2-acid digestion by AAS, and GE_FAA30V5 for Au by 30g Fire Assay by AAS). Overlimit assays were completed as necessary by pyrosulphate fusion/XRF for Cu, Pb, Zn (code GO_XRF70V) and Ag by 30g Fire Assay, gravimetric (code GO_FAG37V). SGS Natural Resources analytical laboratories operate under a Quality Management System that complies with ISO/IEC 17025. SGS CANADA’s minerals laboratory in Burnaby is accredited by the Standards Council of Canada (SCC) for specific mineral tests listed on the scope of accreditation to the ISO/IEC 17025 standard. Further details regarding SGS procedures are available at SGS Analytical Methods. Canterra also submits representative pulps to ALS Geochemistry’s laboratory in Moncton New Brunswick for additional independent check assays.

Qualified Person
Paul Moore MSc. P.Geo. (NL), Vice President of Exploration for Canterra Minerals Corporation, a Qualified Person within the meaning of National Instrument 43-101, has reviewed and approved the technical disclosure in this news release.

ON BEHALF OF THE BOARD OF CANTERRA MINERALS CORPORATION
Chris Pennimpede
President & CEO

Additional information about the Company is available at www.canterraminerals.com
For further information, please contact: +1 (604) 687-6644
Email: info@canterraminerals.com