Allegiant Receives BLM Approval for Exploration at Castle Zone Within Eastside Gold Project

PLAN OF OPERATION SIGNIFICANTLY EXPANDS THE PROJECT AREA

Tonopah, Nevada / August 20, 2025 - Allegiant Gold Ltd. (“Allegiant” or the “Company”) (AUAU: TSX-V) (AUXXF: OTCQX) is pleased to announce that it has received formal approval from the Bureau of Land Management (BLM) and the Nevada Division of Environmental Protection (NDEP) for its Environmental Assessment (EA) and Plan of Operations for the Castle Project, located in Esmeralda County, Nevada, approximately 22 miles west of Tonopah.

The approval allows Allegiant to proceed with an extensive multi-year exploration program, including up to 50 acres of surface disturbance, multiple drill phases, and the ability to construct roads, drill pads, sumps, staging areas, and conduct trenching over a highly prospective gold- bearing area; leading to more comprehensive large-scale exploration.

CASTLE PROJECT PLAN HIGHLIGHTS:

• Approved for up to 145 drill pads in Phase I, with flexibility for additional drilling phases
• Up to 50 acres of permitted disturbance within a 1,658-acre project boundary
• Located adjacent to the historic Boss Mine, Castle has an inferred resource of 314,000 ounces of gold1
• Significant infrastructure advantages with direct highway access via US Routes 6 and 95

Peter Gianulis, CEO of Allegiant Gold, commented: “The approval of the Castle Plan of Operations is a significant milestone for Allegiant. This permit provides the scale and flexibility we need to aggressively test a large and highly prospective gold system at Eastside and in the heart of Nevada’s Walker Lane trend. We believe the Castle Project has the potential to deliver new discoveries at Eastside and grow into a substantial exploration asset, especially given its proximity to historic production, favorable logistics, and extensive past data.”

1 The updated resource estimate (“Updated Resource Estimate and NI 43-101 Technical Report, Eastside and Castle Gold-Silver Project Technical Report, Esmeralda County, Nevada”) conducted by Mine Development Associates (“MDA”) of Reno, Nevada, with an effective date of July 30, 2021, contained a pit-constrained Inferred Resources (cut-off grade of 0.15 g/t Au) of 61,730,000 tonnes grading 0.55 g/t Au and 4.4 g/t Ag at the Original Pit Zone (1,090,000 ounces gold and 8,700,000 ounces silver) and 19,986,000 tonnes grading 0.49 g/t Au at the Castle Area (314,000 ounces gold). A copy of the Eastside Technical Report can be found on SEDAR at www.sedar.com.

ABOUT ALLEGIANT

Allegiant owns three highly prospective gold projects in the United States all of which are in the mining-friendly jurisdiction of Nevada. Allegiant’s flagship, district-scale Eastside project hosts a large and expanding gold/silver resource and is in an area of excellent infrastructure. Preliminary metallurgical testing indicates that both oxide and sulphide gold mineralization at Eastside is amenable to heap leaching.

ON BEHALF OF THE BOARD

Peter Gianulis
CEO

For more information contact:

Investor Relations
ir@allegiantgold.com

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Certain statements and information contained in this press release constitute "forward-looking statements" within the meaning of applicable U.S. securities laws and “forward-looking information” within the meaning of applicable Canadian securities laws, which are referred to collectively as "forward-looking statements". The United States Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for certain forward- looking statements. Allegiant Gold Ltd.’s (“Allegiant”) exploration plans for its gold exploration properties, the drill program at Allegiant’s Eastside project, the preparation and publication of an updated resource estimate in respect of the Original Zone at the Eastside project, Allegiant’s future exploration and development plans, including anticipated costs and timing thereof; Allegiant’s plans for growth through exploration activities, acquisitions or otherwise; and expectations regarding future maintenance and capital expenditures, and working capital requirements. Forward- looking statements are statements and information regarding possible events, conditions or results of operations that are based upon assumptions about future economic conditions and courses of action. All statements and information other than statements of historical fact may be forward- looking statements. In some cases, forward-looking statements can be identified by the use of words such as “seek”, “expect”, “anticipate”, “budget”, “plan”, “estimate”, “continue”, “forecast”, “intend”, “believe”, “predict”, “potential”, “target”, “may”, “could”, “would”, “might”, “will” and similar words or phrases (including negative variations) suggesting future outcomes or statements regarding an outlook. Such forward- looking statements are based on a number of material factors and assumptions and involve known and unknown risks, uncertainties and other factors which may cause actual results, performance or achievements, or industry results, to differ materially from those anticipated in such forward-looking information. You are cautioned not to place undue reliance on forward-looking statements contained in this press release. Some of the known risks and other factors which could cause actual results to differ materially from those expressed in the forward-looking statements are described in the sections entitled “Risk Factors” in Allegiant’s Listing Application, dated January 24, 2018, as filed with the TSX Venture Exchange and available on SEDAR+ under Allegiant’s profile at www.sedarplus.ca. Actual results and future events could differ materially from those anticipated in such statements. Allegiant undertakes no obligation to update or revise any forward-looking statements included in this press release if these beliefs, estimates and opinions or other circumstances should change, except as otherwise required by applicable law.