Mr. Rob Birmingham reports

GOLDHAVEN INTERSECTS MULTIPLE POLYMETALLIC SULPHIDE ZONES AT MAGNO, INCLUDING UP TO 13 METRES IN D ZONE DRILLING

Goldhaven Resources Corp. has provided an update on its continuing diamond drilling program at the D zone silver-lead-zinc target, located within its flagship Magno project in northwestern British Columbia.

Highlights

• Four of five completed drill holes intersected semi-massive to massive sulphide mineralization at Middle D.
• GOH26-10 and GOH26-13 intersected approximately 10.75 metres and 13 metres, respectively, of cumulative sulphide mineralization across separate intervals.
• GOH26-10 encountered multiple mineralized horizons containing visible galena and sphalerite, together with arsenopyrite-rich sulphides and garnet-bearing skarn, highlighting the polymetallic character of the target.
• Preliminary portable XRF screening of selected drill-core locations in GOH26-10 returned individual spot readings of up to 411,000 parts per million zinc (41.1 per cent Zn), 38,500 ppm lead (3.85 per cent Pb) and 17,600 ppm tin (1.76 per cent Sn), with laboratory assays pending.

Goldhaven has completed five diamond drill holes from two drill pads approximately 75 metres (m) apart within the Middle D area of the historically named D zone, with four of the five completed holes intersecting semi-massive to massive sulphide mineralization within a geophysical anomaly identified in an airborne survey conducted by the company in early 2026.

The company is currently advancing drill hole GOH26-14 as it continues to evaluate the distribution and geometry of mineralization within the target area.

D zone drilling results

The current drilling campaign is focused on evaluating the Middle D portion of the D zone, an area of historically documented silver-lead-zinc mineralization within the Magno project.

Rob Birmingham, president and chief executive officer of Goldhaven, commented:

"We are encouraged by the results at D zone, with four of our first five drill holes intersecting significant intervals of semi-massive to massive sulphide mineralization. The identification of multiple mineralized horizons, including visible lead-zinc sulphides and indications of tin-bearing skarn, is particularly interesting.

"These early results are helping us build a better understanding of the system and guide our next exploration targets. With drilling continuing and assays pending, we look forward to evaluating the potential of D zone alongside our continuing tungsten exploration at Kuhn."

Detailed geological observations -- GOH26-10

GOH26-10 intersected four distinct mineralized zones between approximately 58.8 and 138.1 metres downhole, including 10.75 metres of cumulative semi-massive to massive sulphide mineralization and an additional 0.7 metre of mineralized skarn across separate intervals.

The upper zone (58.8 to 62.15 m) contains visible galena and sphalerite associated with pyrite and pyrrhotite. Deeper intervals (91.9 to 98.0 m and 134.2 to 135.5 m) contain predominantly pyrite, pyrrhotite and arsenopyrite, with locally observed sphalerite, reported cassiterite and hematite alteration. A fourth interval (137.4 to 138.1 m) comprises garnet-bearing, hematite-altered skarn.

These contrasting mineral assemblages may reflect different mineralization conditions within the D zone system and will help guide continuing geological interpretation and exploration targeting.

Preliminary portable XRF observations

Portable X-ray fluorescence (pXRF) screening of selected drill core using a SciAps X-505 handheld analyzer returned individual spot readings of up to 411,000 ppm zinc (41.1 per cent Zn) at 134.6 metres, 280,500 ppm zinc (28.05 per cent Zn) and 38,500 ppm lead (3.85 per cent Pb) at 61 metres, and 17,600 ppm tin (1.76 per cent Sn) at 93.6 metres in GOH26-10.

These preliminary measurements were obtained from select locations on heterogeneous mineralized core for geological screening purposes. They are subject to analytical limitations, including potential matrix effects, and are not laboratory assays or representative of grades across the reported drill intervals. Laboratory assays are pending and may differ materially from the pXRF readings.

The SciAps X-505 handheld pXRF analyzer is calibrated before each use using the manufacturer-provided calibration plate. Geochemical reference standards used in the drill program's QA/QC (quality assurance/quality control) procedures are also analyzed regularly with the pXRF to monitor instrument performance.

Historical mineralization and exploration potential

The D zone has been the subject of historical exploration, including drilling that reportedly intersected significant silver-lead-zinc mineralization.

Historical results include a reported interval of 7.6 metres grading 240 g/t silver, 4.73 per cent lead and 4.74 per cent zinc, providing context for the mineralization historically encountered in the broader D zone area.

Historical results are from 1982 exploration drilling and have not been independently verified by the company. They are provided for historical context and are not necessarily indicative of current drilling results.

Goldhaven's 2025 surface exploration program also identified high-grade polymetallic mineralization across portions of the Magno project.

The company is investigating whether the sulphide mineralization encountered in the current drilling is associated with the historically documented mineralized system and how the mineralized intervals relate to one another. The Middle D area is located in a geophysical anomaly identified in the airborne survey conducted in early 2026.

Historical drill results and surface samples are not necessarily representative of grades or widths in the current drill holes.

Next steps

Goldhaven's near-term priorities at D zone include:

1. Completing GOH26-14 and evaluating additional drill targets within the Middle D area;
2. Completing geological logging, sampling and submission of mineralized drill core for laboratory analysis;
3. Integrating drill-hole information into updated geological plans and cross-sections to evaluate the potential continuity and orientation of mineralization;
4. Reviewing the current drill results in the context of historical drilling and 2025 surface sampling;
5. Reporting assay results as they become available and have undergone appropriate quality assurance and quality control review.

The company will provide further updates as exploration progresses.

Qualified person

The technical and scientific information contained in this news release has been reviewed and approved by Raymond Wladichuk, PGeo, who is a non-independent qualified person as defined under National Instrument 43-101 and a consultant of the company.

About Goldhaven Resources Corp.

Goldhaven Resources is a Canadian junior exploration company focused on advancing highly prospective mineral projects in North and South America. The company's flagship asset is the district-scale Magno project in the Cassiar district of Northern British Columbia. Goldhaven also owns the Three Guardsmen copper-gold project in British Columbia and the Copecal gold project in Mato Grosso, Brazil. In addition, the company holds a portfolio of critical mineral projects in Brazil.

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