Mr. David Greenway reports

GIANT MINING CONTINUES ENGAGEMENT WITH RESPEC TO INTEGRATE 2024-2025 DRILL DATA AND BRECCIA BODY INTO MAJUBA HILL COPPER-SILVER-GOLD PROJECT 3D MODEL

Giant Mining Corp. has continued its engagement with Respec Company LLC of Reno, Nev. Respec will incorporate drilling data from the company's 2024 diamond core program and the 2025 spring diamond core drilling program at the Majuba Hill porphyry copper-silver-gold project in Pershing county, Nevada.

This information will be integrated into the Majuba Hill copper project 3-D model.

David Greenway, president and chief executive officer of Giant Mining, commented: "Continuing our engagement with Respec is a critical step in advancing Majuba Hill. By integrating the latest core data into the model, we are not only refining the geological model but also strengthening the project's potential. This work provides a clear path for future drilling, metallurgical studies and the evaluation of new targets, all of which are essential to unlocking Majuba Hill's full potential as a significant copper-silver-gold asset in Nevada."

Purpose of engagement

Building on its mandate, Respec's updated interpretation and technical review of the Majuba Hill copper-silver-gold project will incorporate results from the company's most recent drill program, including core data from drill holes MHB-30 through MHB-36. This work will refine the geometry of breccia bodies, evaluate the impact of new findings on project potential and help advance the geologic controls for copper mineralization. In addition, the review will guide the company's strategy for further drilling, determine the timing of metallurgical studies and support the evaluation of new target zones.

Over the next three to five weeks, Respec will:

• Consider what changes the new improved model and data will provide for economic potential;
• Integrate recent drilling into the 3-D model;
• Improve breccia body geometry in the 3-D model;
• Incorporate silver into the exploration model;
• Evaluate additional target zones, including the Northern breccia, Ball Park breccia and 789 resistivity target.

Strategic impact

The updated interpretation will provide Giant Mining with a stronger technical foundation for future economic potential while highlighting the potential of new target zones across the Majuba Hill property. These results will support the company's broader strategy of advancing Majuba Hill as a key domestic source of copper and silver at a time of heightened U.S. demand for secure, reshored supply chains.

Majuba Hill's critically important characteristics are as follows.

Location:   Nevada, United States -- a globally top-ranked mining jurisdiction, ranked No. 1 in the Fraser Institute's 2022 Annual Survey of Mining Companies

Project size:  9,684 acres

Infrastructure:  The Majuba Hill property is 113 road kilometres (70 miles) southwest of Winnemucca, Nev., and 251 kilometres (156 miles) northeast of Reno. Access is by well-maintained county roads from the Imlay, Nev., exit on U.S. Interstate 80 and travelling westward 23 miles. People, roads, power and water are the basic elements when considering infrastructure, and Majuba Hill already has a solid infrastructure foundation for building a large facility, which will provide significant savings compared with more remote projects.

History:  historical producer

Drilling:  approximately 89,395 feet of drilling to date; rough replacement value of drilling $12.1-million (U.S.) using current costs

Mineralization:  The project shows indications of a potentially large copper-silver-plus-or-minus-gold-mineralized body with many features in common with both large porphyry copper, silver and gold projects.

Expandability:  The induced polarization survey, deep drilling and stepout drilling indicate significant expansion potential, with mineralization open in all directions.

Fully financed:  secured financing for next phase of drilling at Majuba Hill

Quality assurance/quality control (QA/QC) measures, chain of custody

The company utilizes a QA/QC program using best industry practices at the Majuba Hill project. The samples are placed in cloth sample bags and are transported from the Giant Mining secure warehouse to the ALS Labs sample prep facility in Elko, Nev. ALS Labs then securely transports the prepared pulps to its analytical lab in North Vancouver, B.C.

Drill core samples are sawn in half lengthwise and one-half is placed in labelled cloth sample bags. All samples are analyzed for copper, gold, silver and 33 other elements. Gold is determined by ALS Labs method Au-AA23, which is a fire assay with an AAS finish on a 30-gram split. Copper, silver and the remaining 31 elements are determined by ALS Labs method ME-ICP61, which is a four-acid digestion and ICP-AES assay. Approximately 5 per cent of the submitted samples are drill duplicates and copper-gold-porphyry commercial standard reference material pulps. The remaining pulps will be retrieved from ALS Labs.

Qualified person

The scientific and technical information contained in this news release has been reviewed and approved by E.L. (Buster) Hunsaker, CPG No. 8137, a non-independent consulting geologist, who is a qualified person as such term is defined under National Instrument 43-101, Standards of Disclosure for Mineral Projects.

Market awareness

The company has entered into an amendment to its existing advertising agreement with Gold Standard Media LLC, a Texas-based media firm. Under the amended agreement dated Sept. 10, 2025, GSM will continue to provide marketing and promotional services for a total consideration of up to $550,000 (U.S.), inclusive of a $150,000 (U.S.) increase from the previously announced $400,000 (U.S.) commitment. GSM has a business address located at 723 W University Ave., Georgetown, Tex., 78626, and can be contacted at 1-512-843-1723 or ceo@goldstandardir.com. GSM and its principals are arm's length from the company. The company shall not issue options or other securities in consideration for GSM's services.

In addition, Giant Mining has engaged Interactive Offers LLC, a Delaware-based advertising technology platform, through a services agreement dated July 8, 2025. Under the agreement, Interactive will provide fully managed digital marketing campaigns, including dedicated email and SMS (short message service) distribution, for an initial budget of $50,000 (U.S.). Either party may pause or cancel the campaign upon 48 hours of notice. Interactive has a business address located at 327 Plaza Real, Suite 319, Boca Raton, Fla., 33432, and can be contacted at 1-844-563-3377 or support@interactiveoffers.com. Interactive and its principals are arm's length from the company, and compensation will be paid in cash only. The company shall not issue options or other securities in consideration for Interactive's services.

About Giant Mining Corp.

Giant Mining is focused on identifying, acquiring and advancing late-stage copper and copper-silver-gold projects to meet the growing global demand for critical metals. This demand is driven by initiatives like the Green New Deal in the United States and similar climate-focused programs worldwide, which require substantial amounts of copper, silver and gold for electric vehicles, renewable energy infrastructure, and the modernization of clean and affordable energy systems.

The company's flagship asset is the Majuba Hill copper, silver and gold district, located 156 miles (251 kilometres) from Reno, Nev. Majuba Hill is situated in a mining-friendly jurisdiction with supportive regulations and has the potential to become one of the next major copper deposits, critical for meeting the increasing need for this red metal.

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