Mr. David Greenway reports

GIANT MINING SUBMITS CORE FROM 1,100-FOOT AI DRIVEN CORE HOLE MHB-36 -- ALL REMAINING ASSAYS NOW PENDING FROM SPRING 2025 DRILL PROGRAM

All core from Giant Mining Corp.'s drill hole MHB-36, completed to a total depth of 1,100 feet (335.3 metres), has been sampled and submitted to ALS Global Services (ALS Labs) 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 (1,671.7 metres) at the Majuba Hill porphyry copper-silver-gold project, located in Pershing county, Nevada. All core has now been submitted for assay.

This hole was designed using Exploration Technologies Inc. (ExploreTech) and its proprietary probabilistic, artificial-intelligence-driven geophysical modelling, which strategically enhanced the company's targeting capabilities for this phase of the program. ExploreTech optimizes drill targeting and field operations, enabling better, faster and more cost-effective discoveries.

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).

"With assays pending from holes MHB-34 and MHB-35 and MHB-36, we're very encouraged by the progress of our 2025 drill program," said David Greenway, president and chief executive officer of Giant Mining. "These results are expected to enhance our evolving deposit model at Majuba Hill, which we believe is shaping up to be a significant copper, silver and gold discovery in a top-tier jurisdiction with strong infrastructure. The project aligns with America's critical minerals and clean energy priorities. With our special warrant financing now under way, we're well positioned to accelerate development and build long-term shareholder value."

MHB-36 intersected visual disseminated and vein-hosted chalcopyrite mineralization within the targeted breccia zone, beginning at a downhole depth of 650 feet (198 metres). Mineralization was observed intermittently continuing beyond 905 feet (274.32 metres).

The successful intersection of targeted mineralization, as predicted by ExploreTech's AI-driven geophysical modelling, provides a strong foundation for optimizing future drill programs in 2025, 2026 and beyond.

Quality assurance/quality control (QA/QC) measures and 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 such as 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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