Mr. David Greenway reports

GIANT MINING SUBMITS CORE FOR ASSAY FROM 1,963 FOOT HOLE MHB-34 AT MAJUBA HILL COPPER PROJECT- ADVANCING CRITICAL MINERALS IN NEVADA

Giant Mining Corp. has sampled and submitted all core from drill hole MHB-34, completed to a total depth of 1,963 feet (598.3 metres), to ALS Global Services for analysis. This hole was part of the company's phase 1 spring 2025 drill program, which comprised five diamond drill holes totalling 5,484.5 feet (1,671.68 metres) at the Majuba Hill porphyry copper-silver-gold project, located in Pershing county, Nevada.

The phase 1 program was designed to expand known zones of copper mineralization and advance the Majuba Hill project toward completion of a mineral resource estimate (MRE). Hole MHB-32, the first of the five holes drilled, returned two significant copper-mineralized zones within a broader interval of 379.5 feet (115.7 metres) grading 0.33 per cent copper and 16.97 parts per million silver. Notably, the results included 169.5 feet of 0.41 per cent copper, with higher-grade intervals of 40 feet at 1.36 per cent copper and 10 feet at 4.36 per cent copper, indicating that mineralization extends deeper and farther north than previously known (see press release dated May 22, 2025).

David Greenway, chief executive officer of Giant Mining, commented: "In my entire career, I've never seen drill core like this; it's truly extraordinary. When we began drilling MHB-34, we had high expectations, but what we encountered exceeded them all. In my entire career, I've never seen drill core like this. The presence of visible native copper beyond 1,850 feet, alongside cuprite and chalcopyrite, is a powerful indicator of the scale and strength of the mineralized system at Majuba Hill. This hole reinforces our belief that Majuba Hill is evolving into a world-class copper, silver and gold discovery. Located in a top-tier mining jurisdiction with excellent infrastructure, this project is uniquely positioned to contribute to America's clean energy transition and critical minerals independence. We eagerly await the assay results from ALS Labs and look forward to advancing our 2025 exploration program."

About hole MHB-34:

• Visible native copper observed beyond 1,850 feet signals scale and strength at Majuba Hill;
• Strong presence of native copper, cuprite and chalcopyrite suggests proximity to a primary copper sulphide zone;
• Majuba Hill positioned as a homegrown U.S. critical minerals project with Tier 1 infrastructure advantages;
• Native copper, cuprite and chalcopyrite were persistent in the deeper part of MHB-34.

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 IP (induced polarization) survey, deep drilling and stepout drilling indicate significant expansion potential, with mineralization open in all directions.

Fully financed:  secured financing for 2025 drilling campaign

Quality assurance/quality control measures, chain of custody

The company utilizes a QA/QC program using best industry practices at the Majuba Hill project. Drill core samples are sawn in half lengthwise and one-half is placed in labelled cloth sample bags. Sample bags 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.

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.

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.

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.

Market awareness

The company has extended its agreement with Gold Standard Media LLC and its affiliates, which will continue to provide the company with advertising services, including: (i) creating landing pages; (ii) digital marketing; (iii) e-mail marketing; and (iv) influencer marketing. The extension agreement is for an additional six months to the original term as previously announced on Jan. 10, 2025, in consideration of a payment of up to $400,000 (U.S.). 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.

The company further announces that it has engaged the services of 1123963 B.C. Ltd. (doing business as Capitaliz On It), a social-media-influencer-focused digital marketing agency out of Vancouver, B.C., to increase investor awareness and interest in the company as well as attracting new investors through various on-line platforms and a comprehensive digital media marketing campaign for the company. Capitaliz has been engaged for a period of three months commencing June 9, 2025, for $90,000. Capitaliz is at arm's length to the company and the principal does not own any shares of Giant Mining. Capitaliz can be reached by e-mail at charles@capitalizonit.com or by phone at 778-237-1431.

The company further announces it has engaged Feneck Consulting Group LLC for certain capital markets, strategic marketing and investor relations services to raise Giant's investor profile. The agreement is effective as of May 20, 2025, and shall continue until Nov. 19, 2025, and may be extended for additional six-month increments by the parties' mutual written agreement beginning on Nov. 20, 2025; and (ii) the company will pay the consultant cash in the amount of $15,000 (U.S.) for the period May 20, 2025, to Aug. 19, 2025, and cash in the amount of $22,500 (U.S.) for the period from Aug. 20, 2025, through Nov. 19, 2025. Feneck Consulting Group can be reached by phone at 1-732-300-5451 and by e-mail at john.feneck@gmail.com.

Furthermore, the company announces it has extended its agreement with Plutus Invest & Consulting GmbH as of May 28, 2025, for an additional term of two months in consideration for a payment of 160,000 euros to provide consulting services related to advertising, marketing, PR (public relations) strategies and investor awareness in the European market. Plutus has a business address at Buchtstr. 13, Bremen, 28195, Germany, and can be contacted by e-mail at contact@plutuinves.de or by telephone at 49-421-1754-0174). Plutus (including its directors and officers) has an arm's-length relationship with the company. The company will not issue any securities to Plutus as compensation for its marketing services.

We seek Safe Harbor.