Newly Discovered Polymetallic Zone at Green Monster Project Shifts Focus of Drilling and Exploration Plan

Vancouver, British Columbia--(Newsfile Corp. - August 13, 2025) - Glenstar Minerals Inc. (CSE: GSTR) (OTCQB: GSTRF) (FSE: VO20) ("Glenstar" or the "Company") is pleased to provide an update on the Green Monster Project in southwestern Nevada, following positive results from the drill program undertaken in May 2025 (see news release dated July 16, 2025).

The ongoing review of the data obtained from this most recent drill program, along with data compiled from previous exploration field work, has raised a number of interesting questions that will hopefully be answered in the phase 2 drill and exploration plan currently being finalized.

The intersection of a zone of robust polymetallic mineralization in a position 150 metres away from the main target zone of the phase 1 drill program has resulted in a change in the focus for exploration of the property, and Glenstar is now planning for extension drilling of the new zone. Hole GMST-4 was meant to test a magnetic high that was previously identified during the Company's exploration field work of the property in 2023. This new zone is approximately 10 metres (32 feet) wide and is centered on a very high-grade zinc occurrence that is >30%, with a significant assay result of up to 177 ppm of silver (161.5 g/t or 5.7 oz/t), 523 ppm of nickel (.0523%), cobalt up to 91.9 ppm (.0019%), and copper that is >.36%. The nickel and cobalt percentages reported are subjectively classified as highly anomalous for the geological structure. Mineralization in this hole was intersected at depths from ~131 metres (~430 feet) to ~142 metres (~465 feet) and occurs in the hanging wall of the Green Monster Fault Zone. All assay results were provided to the Company by ALS in Vancouver, BC.

While hole GMST-4 was simply intended to test a magnetic high, the drill placement and drilling conditions resulted in the hole barely grazing the southeast edge of the magnetic subsurface feature. This led to the discovery of unexpected strong mineralization in a significantly different stratigraphic unit that was not part of the main area of interest for the Phase 1 drill program. It is important to note that the newly discovered zone in no way explains the magnetic anomaly, as the intersection is strongly oxidized and has no magnetic response. The magnetic high has yet to be explained and could result from sulfide mineralization at deeper levels.

The mineralization was intersected within a complex rock unit containing limestone, sandstone, and shale, which is known to be disrupted by numerous thrust faults, and the mineralization is contained within a strongly decalcified section of the host rocks. A general analog from the current data we have is the Eureka District in central Nevada where gold, silver, zinc, and lead were produced from strongly oxidized and faulted carbonate stratigraphy.

According to Glenstar's project geologist Bob Marvin, "The extraordinary results that came back for hole GMST-4 have significantly altered our next stage exploration and drilling plans for the property, and Phase 2 will focus on expanding the new hanging wall zone and testing the continuation along strike and at depth."

This new zone is completely open and represents a significant increase to the target size of the project.

Glenstar's Green Monster Property ties into the larger district scale Green Monster Fault Zone, which is approximately 30 kilometres (18.6 miles) in length and well known for containing a preponderance of zinc, but has also shown a number of areas that are significantly anomalous for nickel, cobalt and copper. Results from previous field work indicated that the Green Monster Property is one of those prospective areas, and the assay results, thus far, from this initial drill program appear to support the preliminary findings from earlier exploration activities.

Project Background & Recent Exploration Work

The Green Monster Property is comprised of 35 federal lode claims covering ~700 acres located in Clark County, Nevada, on the west trending spur of the Spring Mountains and is approximately 40 miles southwest of Las Vegas. Until the recent drill program in May of 2025, no drilling was ever conducted on the property, but the Company's previous identification of robust nickel-copper with highly anomalous cobalt from sampling work done in 2022 indicated that several targets were ideal for shallow RC drilling.

Glenstar acquired the Green Monster Property and conducted initial groundwork in 2022 that included reconnaissance geologic mapping, surface rock sampling, soil sampling, and a drone magnetic survey. Channel sampling across the exposed back of a raise off the main shaft returned 1.18 meters of 3.77% Cu (Copper), 3.06% Ni (Nickel), 0.21% Co (Cobalt) and 6.83% Zn (Zinc). These values are well in excess of select dump samples from historical underground workings and represent in-place, vein style mineralization. Sampling of oxide and sulfide bearing boulders directly downhill of the patented workings has confirmed the presence of very high zinc (>10%) and silver (>200ppm), as well as copper, uranium, and lead. (Sampling results provided above were previously published in the Green Monster Project NI 43-101 Technical Report dated June 20, 2023, Section 7.5).

Extension of Investor Awareness & Marketing Agreement

The Company has agreed to continue the engagement of Altura Media Co. Inc. ("Altura") of Vancouver, British Columbia to provide certain marketing and investor awareness services in accordance with the policies of the Canadian Securities Exchange and applicable legislation. Under the terms of the continuation of the agreement, announced July 14, 2025, Altura will continue to deliver strategic advertising, public relations and investor communications services for the company for the extended period for CDN$150,000. These services will be focused on enhancing Glenstar's visibility and engagement within domestic and foreign markets and include a full suite of services including digital advertising, content creation, and shareholder communications support. The Company has the right to extend the service for an additional fee of up to CDN$150,000, based on the scope of services provided during the term of the engagement. The agreement includes provisions for fee adjustments, early termination, and extensions of the engagement, should it be determined to be in the best interests of the Company. Altura (including its directors and officers) is an arm's length party to Glenstar, and to the best of the Company's knowledge, neither Altura nor any related parties hold or have the right to acquire securities of Glenstar Minerals Inc., and the Company will not issue any securities to Altura as compensation for its services. Altura has a business address at 1055 West Georgia Street Suite 1500, Vancouver BC V6E 4N7 and may be contacted via email at contact@alturamedia.co, or by telephone at 778-988-5503.

About Glenstar Minerals Inc.

Glenstar is a mineral exploration company with a focus on polymetallic minerals. These elements are classified as critical minerals and are essential in the manufacturing of sophisticated electronics and other vital energy technologies. The Company's mission is to leverage its knowledge and connections to explore, acquire, and develop critical mineral and energy metal properties throughout the world.

Glenstar's shares trade on the Canadian Securities Exchange (CSE) under the symbol "GSTR", on the Frankfurt Stock Exchange under the symbol "VO20", and on the Over-the-Counter market (OTCQB) in the United States under the symbol "GSTRF".

Robert Marvin, P.Geo (ONT) is the qualified person as defined by National Instrument 43-101 and is the independent consulting geologist for Glenstar Minerals Inc., who has examined the Green Monster and Wildhorse properties on the ground numerous times since 2022 and 2024 respectively. All fieldwork relating to geologic observations and sampling as reported herein, has been directly overseen by Mr. Marvin who supervised the preparation of, and has reviewed and approved, the technical information in this release.

ON BEHALF OF THE BOARD

"David Ryan"
President & CEO

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

Cautionary Statement Regarding Forward-Looking Information Certain information contained in this news release constitutes "forward-looking information" or "forward-looking statements" (collectively, "forward- looking information"). Without limiting the foregoing, such forward-looking information includes statements regarding the process and completion of any Offering, the use of proceeds of the Offering and any statements regarding the Company's business plans, expectations and objectives. In this news release, words such as "may", "would", "could", "will", "likely", "believe", "expect", anticipate", "intend", "plan", "estimate" and similar words and the negative form thereof are used to identify forward-looking information.

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We seek safe harbour.

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