Greenheart Gold Identifies High-Grade Zones at Igab and Wide Gold Intercepts at Tosso Creek

• Koela West returned 11.0 metres at 9.48 g/t Au, with additional results of 11.0 m at 4.36 g/t Au, including 3.0 m at 15.29 g/t Au; both zones remain open along strike
• Koela East returned 12.0 m at 4.82 g/t Au, including 9.0 m at 6.32 g/t Au; grab samples from the shear zone reached up to 90.0 g/t Au
• Tosso Creek initial trenching returned 86.0 m at 0.63 g/t Au and 62.0 m at 0.71 g/t Au from only a small portion of the known anomalies
• Tosso Creek's identified anomaly corridors span a combined area of 6 kilometres by 2 kilometres, with additional anomalies near the granite contact in the southeastern portion of the project
• A drill rig is planned for Igab in late Q1 2026, followed by Tosso Creek in Q2 2026

Greenheart Gold Inc. (TSXV: GHRT; OTCQX: GHRTF) is a gold exploration company focused on building a portfolio of early-stage projects within the Guiana Shield, a geologically prospective belt across northern South America known to host numerous gold deposits. The company is led by former executives and exploration specialists from Reunion Gold, the team behind the discovery of the multimillion-ounce Oko West deposit in Guyana. Greenheart Gold draws on that regional experience and an established local network to identify and advance orogenic gold targets, a deposit style formed through deep crustal processes and typically associated with structurally controlled mineralised systems, across its projects in Guyana and Suriname.

Two New Gold Zones Identified at Igab's Koela Target

The Igab project hosts five target areas identified through soil sampling, trenching, geological mapping, and drone magnetics surveys. Heavy rainfall in the first half of 2025 directed efforts toward the southern Lemon Tree target, which had already produced a channel sample of 31.0 metres grading 1.36 g/t Au (grams per tonne of gold). As conditions improved in the latter half of the year, the company constructed access roads and established a remote camp in the north of the project to support work at the Koela and Cannibal Creek targets.

At the Koela Target, two rounds of soil sampling had flagged anomalous gold values across an area of roughly 1,500 metres by 500 metres. Follow-up trenching confirmed two distinct mineralised zones, Koela West and Koela East, both identified as shear zones, areas where rock has been structurally deformed and displaced, carrying gold-bearing quartz veins. Koela West has been outlined over approximately 500 metres of strike length, the horizontal extent along the zone, and remains open in both directions. The standout result was trench T-066, which returned 11.0 metres at 9.48 g/t Au. Additional trenches recorded 10.0 metres at 1.22 g/t Au and 11.0 metres at 4.36 g/t Au, the latter including 3.0 metres at 15.29 g/t Au. Grab samples collected along strike reached 33.77 g/t Au, 14.85 g/t Au, and 8.06 g/t Au.

Located approximately 350 metres to the east, Koela East is a separate but parallel structure. Trench T-078a intersected 12.0 metres at 4.82 g/t Au, including 9.0 metres at 6.32 g/t Au, while T-078 returned 3.0 metres at 5.58 g/t Au on the eastern flank of the zone. Trenching of the western flank has been delayed by steep terrain; surface grab samples from that side returned values of 90.0 g/t Au, 41.7 g/t Au, 36.1 g/t Au, and 24.6 g/t Au, among others. Both Koela East and Koela West remain open along strike. Cannibal Creek, a separate target, lies approximately 3 kilometres along the same structural corridor to the northwest, and trenching and mapping are now underway there while the company awaits additional assay results from Koela.

Tosso Creek Delivers Wide Intercepts Across Initial Trenches

The Tosso Creek project has multiple corridors of anomalous gold values within a 6-kilometre by 2-kilometre area in the western portion of the concession, with individual corridors ranging from 200 metres by 1,000 metres up to 400 metres by 2,000 metres. The southeastern part of the project hosts several additional anomalies near the contact between granite and greenstone rock units, including one covering approximately 1,000 metres by 400 metres. Infill sampling near this contact is ongoing, with some results still pending.

Systematic trenching began in late 2025, focusing on the westernmost anomalies. Results have been received from 11 of 14 completed trenches, covering roughly 1,000 metres of strike length across two of the identified anomalies. TOST25-018 returned 86.0 metres at 0.63 g/t Au, and TOST25-011 intersected 62.0 metres at 0.71 g/t Au, including 4.0 metres at 1.14 g/t Au and 6.0 metres at 1.01 g/t Au. TOST25-017 and TOST25-015 added results of 14.0 metres at 0.56 g/t Au and 26.0 metres at 0.41 g/t Au, respectively.

Justin Van der Toorn, President and CEO of Greenheart Gold, stated:

"The early trench results at Tosso Creek are promising, highlighted by trenches TOST25-011 intersecting 62.0 m grading 0.71 g/t Au... and T-018 intersecting 86.0 m grading 0.63 g/t Au."

The results reported to date represent only a fraction of the total anomaly area, with trenching, mapping, and sampling continuing across both the western corridors and the southeastern contact zone ahead of planned drilling.

Drill Programmes Planned for Igab in Q1 2026 and Tosso Creek in Q2 2026

Greenheart Gold is preparing to mobilise a diamond drill rig to Igab at the end of Q1 2026. Diamond drilling extracts a continuous cylindrical core of rock from below the surface, allowing geologists to assess the grade and continuity of a mineralised zone at depth. At Igab, the initial drill programme will test Koela East, Koela West, and the Lemon Tree zone, while surface work continues in parallel at Cannibal Creek and other areas of the project.

President and CEO of Greenheart Gold Justin Van der Toorn noted:

"The drill program will test the known targets at both Lemon Tree and Koela East and West, while the Company continues to advance and test additional potential targets including Cannibal Creek and other areas of Igab."

Tosso Creek is scheduled to follow, with rig mobilisation anticipated in Q2 2026. Ongoing surface work at both the western anomaly corridors and the southeastern granite contact zone is intended to further define drill targets ahead of mobilisation. The sequencing reflects the company's plan to advance both projects within the same calendar year.

Outlook

With two new mineralised zones confirmed at Koela and initial trench results received across a portion of Tosso Creek's anomaly system, Greenheart Gold is advancing both Suriname projects toward the drill stage. The Igab programme, targeting Koela East, Koela West, and Lemon Tree, is planned to begin in late Q1 2026, with Tosso Creek drilling to follow in Q2 2026. Surface work continues at both projects, including trenching at Cannibal Creek and infill sampling near Tosso Creek's granite contact, as the company works to define additional targets ahead of each drill campaign.

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