Mr. Russell Starr reports

GREENRIDGE EXPLORATION ANNOUNCES COMPLETION OF SUMMER 2026 EXPLORATION PROGRAM AT THE HOOK-CARTER URANIUM PROJECT IN PARTNERSHIP WITH DENISON MINES

Greenridge Exploration Inc. has completed a 2026 summer exploration program at the Hook-Carter uranium project located in the southwestern Athabasca basin region of Saskatchewan, Canada. The project is owned 25 per cent by Greenridge and 75 per cent by Denison Mines Corp., with Denison acting as operator of exploration. Hook-Carter is host to the interpreted northeastern strike extensions of parallel structural trends, including the Derkson corridor and the prolific Patterson Lake corridor (PLC), along which multiple uranium deposits and showings have been discovered to the southwest of the project.

Highlights of the Hook-Carter 2026 exploration program

• Denison and Greenridge carried out 13 lines of fixed loop electromagnetic (FLEM) surveying totalling 15.85 line kilometres on two ground loops, with readings taken at 50-metre station spacings on the Derkson corridor, where summer ground conditions allowed access to the area of interest.
• Concurrent with the FLEM survey, a geochemical sampling crew collected 429 soil samples at 50-metre intervals on 13 lines over the 19.5-line-kilometre Derkson corridor grid. The soil samples were submitted to Activation Laboratories Ltd. (Actlabs) in Ancaster, Ont., for ICP-OES and ICP-MS analyses by four-acid digestion and INAA, and for spatiotemporal geochemical hydrocarbons (SGH) soil analysis.

A light detection and ranging (lidar) survey was flown over the PLC and Derkson corridors using an exSwarm lidar high-resolution digital elevation model survey with 0.5-metre cells over a 44 square km area. The lidar survey will provide precise, three-dimensional information about the surface of the project, which can assist to outline structural features such as the muted expression of strike-slip faults, linear rifts and depressions.

Russell Starr, chief executive officer of Greenridge, stated: "Our 2026 summer program at Hook-Carter is an important step for target development at Hook-Carter. The results of this work are expected to provide a higher focus for drill hole targeting along the Derkson corridor, which will support potential drilling programs in 2027 and beyond."

About the Derkson corridor

In 1978, drill hole DER-04 collared within the Derkson corridor intersected 0.24 per cent U3O8 (triuranium octoxide) over 2.5 metres from 120.5 to 122.5 metres, approximately 4.25 kilometres to the south of the current boundary of the project.

The uranium discovery in hole DER-04 sparked a series of drill campaigns by the Saskatchewan Mining and Development Corp. (SMDC, a predecessor company of Cameco Corp.) to locate additional mineralization, but no significant uranium occurrences were found in the immediate area of hole DER-04. Denison and Greenridge consider that the northern extent of the Derkson corridor could be highly prospective for hosting uranium mineralization, as is evidenced by a 2004 study of historical Derkson corridor drill core carried out by UEM Inc. (a joint venture company held by Cameco and a predecessor of Orano Canada) that concluded: " ... In summary, the drill holes which display the most encouraging combination of prospective features ... include DDHs DER-23, DER-09 and DER-13. Significantly, DDH's DER-23 and DER-09 are the most northerly of the DER holes. There has been only a limited number of prior drill tests ... to the north of DDH DER-23." The site of drill hole DER-23 lies approximately 2.75 kilometres south of the current Hook-Carter property boundary.

About the Hook-Carter geochemical survey

SGH is a method of geochemical exploration that detects 162 specific hydrocarbon compounds presumed to have migrated from a mineralized body in the subsurface through rock cover and overburden, and have been adsorbed on the surficial soils. SGH laboratory analyses detect these hydrocarbons as a method of identifying the location of buried, or "blind," mineralized bodies. Recent research has shown that there are relationships between specific commodities and SGH compound classes that can provide a "hydrocarbon fingerprint" for metals such as uranium.

About Hook-Carter

Hook-Carter consists of 11 claims covering 25,115 hectares and is located in the southwest corner of the Athabasca basin approximately 147 kilometres northeast of La Loche, Sask. Hook-Carter is interpreted to host the northeastern strike extension of the PLC, which hosts NexGen Energy's Arrow uranium deposit (and a potential expansion of the width of the PLC with the recently discovered Patterson corridor East zone), Paladin Energy Ltd.'s Triple R uranium deposit and its new discovery known as the Atlas occurrence, and Purepoint Uranium Group's Spitfire, Hornet and Dragon zones in a joint venture with Cameco and Orano Canada. The project also overlies the interpreted strike extensions of the Carter and Derkson corridors, each of which represent highly prospective and underexplored structural corridors.

The 2026 summer exploration program was based from a permitted temporary work camp located on the project. Denison, as operator of exploration, is committed to collaborating with indigenous peoples and communities to build long-term, respectful, trusting, and mutually beneficial relationships, and aspires to avoid any adverse impacts of Denison's activities and operations, which intentions are expressed in Denison's indigenous peoples policy.

Details of the Hook-Carter joint venture agreement

In October, 2016, ALX Resources Corp. and Denison entered into a purchase agreement whereby ALX sold an 80-per-cent interest in the project in exchange for 7.5 million common shares in the capital of Denison. ALX retained a 20-per-cent interest in Hook-Carter, and Denison agreed to finance ALX's share of the first $12.0-million of expenditures. On Nov. 15, 2019, ALX and Denison executed a written acknowledgment with respect to the deemed formation of a joint venture between them upon Denison's completion of a requirement to solely finance a minimum of $3.0-million of project expenditures within an initial 36-month funding period. From 2016 to 2023, Denison's exploration expenditures at Hook-Carter totalled approximately $7.08-million, including the completion of surface and airborne geophysical programs, as well as nearly 12,000 metres of diamond drilling.

In May, 2024, the Hook-Carter joint venture was amended whereby ALX could increase its ownership interest in the project from 20 per cent to 25 per cent by funding the next $3.0-million of exploration at the project by November, 2026. On Dec. 30, 2024, ALX was acquired by Greenridge by way of a court-approved plan of arrangement and Greenridge assumed ALX's ownership interest and its funding obligations in the amended Hook-Carter joint venture. During the first quarter and second quarter 2026, Greenridge met the $3.0-million expenditure and has increased its cumulative ownership percentage in the Hook-Carter joint venture to 25 per cent.

Statement of qualified person

The scientific and technical information contained in this news release has been reviewed and approved by Sean Hillacre, MSc, PGeo, a geological consultant to the company and a qualified person for Greenridge as defined in National Instrument 43-101 -- Standards of Disclosure for Mineral Projects. Mr. Hillacre has examined information regarding the historical and current exploration at Hook-Carter, which includes a high-level review of the historical sampling, analytical, and procedures underlying the information and opinions contained herein.

Management cautions that historical results collected and reported by operators unrelated to Greenridge have not been verified nor confirmed by its qualified person; however, the historical results create a scientific basis for continuing work in at Hook-Carter. Management further cautions that historical results, discoveries and published resource estimates on adjacent or nearby mineral properties, or other properties located within the Athabasca basin, whether in reference to stated current resource estimates or historical resource estimates, are not necessarily indicative of the results that may be achieved on the project.

About Greenridge Exploration Inc.

Greenridge is a mineral exploration company dedicated to creating shareholder value through the acquisition, exploration and development of critical mineral projects in Canada. The company owns or has interests in 19 projects and additional claims covering approximately 229,842 hectares with considerable exposure to potential uranium, gold and nickel discoveries. The company is led by an experienced management team and board of directors with significant expertise in capital raising and advancing mining projects.

Greenridge has one of the largest uranium property portfolios in Canada consisting of 12 projects and additional prospective claims covering approximately 167,800 hectares. The company has opportunities to realize value in a further seven strategic metals projects which include gold, and nickel, copper and cobalt exploration properties totalling approximately 62,042 hectares. project highlights include:

• The Black Lake uranium project, located in the NE Athabasca basin (40 per cent Greenridge, 50.43 per cent Uranium Energy Corp., 8.57 per cent Orano Canada), saw a 2004 discovery hole (BL-18) return 0.69 per cent U3O8 over 4.4 m.
• The Hook-Carter uranium project (25 per cent Greenridge, 75 per cent Denison Mines Corp.) is strategically located in the southwest margin of the Athabasca basin, sitting approximately 13 km from NexGen Energy Ltd.'s Arrow deposit and approximately 20 km from Paladin Energy's Triple R deposit.
• The Gibbons Creek uranium project hosts high-grade uraniferous boulders located in 2013, with grades of up to 4.28 per cent U3O8, and the McKenzie Lake project saw a 2023 prospecting program return three samples which included 844 parts per million U total (0.101 per cent U3O8), 273 ppm U total and 259 ppm U total.
• The Nut Lake uranium project located in the Thelon basin includes historical drilling which intersected up to nine ft of 0.69 per cent U3O8 including 4.90 per cent U3O8 over one ft from eight ft depth. In 2024, Greenridge's prospecting program located a float sample that returned 31.13 per cent U3O8, sourced from the Tundra showing.
• The Firebird nickel project has seen two drill programs (seven holes totalling 1,339 m), where hole FN20-002 intersected 23.8 m of 0.36 per cent Ni and 0.09 per cent Cu, including 10.6 m of 0.55 per cent Ni and 0.14 per cent Cu.

The company has strategic partnerships, which include uranium exploration properties being operated and advanced by Denison Mines Corp. and Uranium Energy Corp. The company's management team, board of directors and technical team bring significant expertise in capital raising and advancing mining projects, and is poised to attract new investors and raise future capital.

We seek Safe Harbor.