• Proven and Probable Mineral Reserves total 6.52 Moz of gold at an average grade of 1.60 g/t Au as of December 31, 2025, representing a 221% year-over-year increase.
• Global Mineral Resources: 9.17 Moz Measured and Indicated and 1.17 Moz Inferred across the Corporation’s portfolio of assets.
• Oko West Project: 4.64 Moz of Proven and Probable Mineral Reserves at an average grade of 1.89 g/t Au following completion of the 2025 Feasibility Study.
• Tocantinzinho Mine: 1.87 Moz of Proven and Probable Mineral Reserves at an average grade of 1.17 g/t Au supporting ongoing operations in Brazil.

G Mining Ventures Corp. (TSX:GMIN) (OTCQX:GMINF) reports its consolidated Mineral Reserves and Mineral Resources as of December 31, 2025, prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects and the Canadian Institute of Mining, Metallurgy and Petroleum Definition Standards for Mineral Resources and Mineral Reserves (2014 Edition). The year-end 2025 update reflects an increase in the Corporation’s reserve base, driven by the publication of the Oko West Feasibility Study. Unless otherwise stated, all dollar amounts are in U.S. dollars.

“Today’s mineral reserve update positions G Mining Ventures with significant strategic option ality,” commented Louis-Pierre Gignac, President & Chief Executive Officer. “We now have a cash-generating asset at Tocantinzinho supporting the construction of Oko West, one of the largest gold projects under construction globally, while advancing Gurupi through technical studies. This three-asset platform provides multiple pathways to production growth, portfolio diversification, and exploration upside. With Oko West advancing toward first gold pour in H2 2027 and Gurupi’s development roadmap taking shape, we are building a diversified, long-life portfolio positioned for sustained growth well into the next decade.”

YE 2025 MRMR Summary

As of December 31, 2025, GMIN reports the following consolidated MRMR:

Table 1 – Consolidated Mineral Resources by Project – Inclusive of Reserves (Effective Dec 31, 2025)

^{Notes: Gold price assumption $1,950/oz. Tonnages and ounces rounded to nearest thousand. See Appendix C for full assumptions.}

Table 2 – Consolidated Mineral Reserves by Project (Effective Dec 31, 2025)

^{Notes: Gold price assumption $1,800/oz. Tonnages and ounces rounded to nearest thousand. See Appendix C for full assumptions.}

Figure 1 – Mineral Reserve Reconciliation (koz Au)

The 221% year-over-year increase in Mineral Reserves reflects the addition of 4.64 Moz from the Feasibility Study at Oko West Project despite depletion at Tocantinzinho following the first full year of commercial production. At Oko West, ~88% of resources were converted into mineral reserves. This is a positive indicator of geological confidence and resource maturity, also demonstrated by the conversion of 2.40 Moz of Inferred Resources (YE 2024) into the Indicated category, reducing Inferred ounces to 1.17 Moz at year-end 2025.

Tocantinzinho Gold Mine, Pará State, Brazil

TZ achieved commercial production in H2 2024 and completed its first full year of operations in 2025, processing ~189 koz of gold for total production of 172 koz of gold, reflecting the asset’s transition into a steady-state cash-generating operation. As of December 31, 2025, the asset reports 1.87 Moz of Proven and Probable Reserves at 1.17 g/t Au. The 2026 exploration budget is set at $8–10 million with the intent of discovering the next deposit within the TZ land package.

Oko West Project, Guyana

Following the completion of the 2025 Feasibility Study, Oko West reports 4.64 Moz of Proven and Probable Reserves at 1.89 g/t Au. The FS outlines a robust 12.3-year mine life with average annual production of ~350,000 oz. Construction is advancing on schedule, with 60% of detailed engineering completed to date and targeting 100% completion in Q3 2026. First gold production is targeted for H2 2027, w ith commercial production anticipated in January 2028. The Corporation notes that mineralization identified through exploration drilling conducted after the completion of the FS has not been included in the 2025 year-end mineral resource estimate, representing potential future reserve growth as the project advances.

Gurupi Project, Maranhão State, Brazil

The Gurupi Project, located in northeastern Brazil, reports 1.83 Moz of Indicated Resources and 0.77 Moz of Inferred Resources as of year-end 2025, establishing it as the third pillar of GMIN’s multi-asset portfolio. The project continues to advance through technical studies, with an updated Mineral Resource Estimate and a Preliminary Economic Assessment targeted for H2 2026. The 2026 exploration budget for Gurupi totals $21 million, supporting resourc e definition drilling, the resumption of regional exploration programs, and the advancement of the Environmental and Social Impact Assessment, which is expected to be filed in H2 2026.

2026 Catalysts

• Oko West Construction: Completion of detailed engineering Q3 2026;
• Gurupi Milestones: ESIA filing H2 2026; Updated MRE & PEA H2 2026
• Exploration Update across Portfolio: $42–50M total budget; 110,000 m drill program

Qualified Person

The technical content of this press release has been reviewed by Julie-Anaïs Debreil, Vice President Geology & Resources of GMIN, a QP as defined in National Instrument NI 43-101 on behalf of the Corporation and has approved the technical disclosure contained in this news release.

About G Mining Ventures Corp.

G Mining Ventures Corp. is a mining company engaged in the development, operation and exploration of precious metal projects to capitalize on the value uplift from successful mine development. GMIN is well-positioned to grow into the next mid-tier precious metals producer by leveraging strong access to capital and proven development expertise. GMIN is currently anchored in mining-friendly jurisdictions: Brazil, with the Tocantinzinho Gold Mine and the Gurupi Project as well as Guyana, with the Oko West Project.