Mr. Javier Reyes reports

GOLDGROUP HIGHLIGHTS EXPLORATION POTENTIAL AT DON DAVID

Goldgroup Mining Inc. has provided a summary of the exploration potential of its Oaxaca operations and regional land package, held by its Mexican subsidiary, Don David Gold Mexico SA de CV, and collectively referred to herein as the DDGM district.

The DDGM district includes the producing Arista and Alta Gracia mines, and an extensive regional land package spanning approximately 55 kilometres along the San Jose structural corridor, which hosts multiple gold-silver and polymetallic epithermal deposits and prospects.

The district is particularly attractive from an exploration perspective because mineralization is not confined to a single deposit: Multiple vein systems occur along the structural corridor, ranging from precious-metal-rich low-sulphidation epithermal systems to polymetallic intermediate-sulphidation epithermal systems.

Arista has three principal polymetallic epithermal vein systems -- Arista, Switchback and Three Sisters. Gold and silver occur together with significant zinc, lead and copper within a network of structurally controlled veins hosted principally by andesitic volcanic rocks. From an exploration perspective, this creates opportunities to extend known veins along strike and at depth, while also discovering additional parallel or subsidiary structures within the larger hydrothermal system.

The Alta Gracia mine represents a somewhat different part of the DDGM district hydrothermal system and is classified as a low-sulphidation, predominantly silver-rich epithermal vein system. Mineralization occurs in structurally controlled quartz veins hosted by volcanic rocks, and contains high silver grades with associated gold but relatively little base metal mineralization compared with Arista. The principal known vein systems include the Mirador and Independencia systems although several additional northeast-trending structures occur across the property. Alta Gracia demonstrates that the broader DDGM district can produce high-grade precious metal veins, creating opportunities to identify extensions of known veins as well as additional parallel structures.

Among the more advanced regional exploration targets are Margaritas and El Rey. The Margaritas project area hosts a series of epithermal gold-silver veins situated northwest of the Arista mine within the central portion of the San Jose structural corridor. Historical exploration has intersected locally high-grade gold and silver mineralization. Margaritas is an important district-scale exploration target and may represent portions of a larger, more extensive vein system.

The El Rey prospect is located near the northwestern end of the DDGM land package and is interpreted as a low-sulphidation epithermal gold-silver vein system. Historical drilling identified narrow but locally very high-grade gold and silver mineralization associated with volcanic rocks, with much of the mineralization encountered historically at relatively shallow depths and locally oxidized. El Rey therefore represents a more precious-metal-dominant style of mineralization than the polymetallic Arista system.

The following figure shows the location of the Arista and Alta Gracia mines and the key exploration targets, Margaritas and El Rey.

On Aug. 17, 2026, the company announced selected results from 25,726 metres of resource definition, expansion and infill drilling, completed as of July 31, 2026, at Arista and Alta Gracia. Please see the prior news release for complete information about the results including assay methods, true widths and other relevant information.

Javier Reyes, chief executive officer, commented: "What makes Don David particularly exciting is the scale and diversity of the exploration opportunities. We are not looking at a single deposit -- we are looking at a district-scale land package extending approximately 55 kilometres along the San Jose structural corridor, with multiple known vein systems and several highly prospective targets that remain to be tested. Our producing Arista and Alta Gracia mines demonstrate the potential of this district while targets such as Margaritas and El Rey provide compelling opportunities to discover and define additional mineralization. We believe we are only beginning to unlock the full exploration potential of the Don David district."

Marketing service agreement

Goldgroup has entered into an arm's-length marketing consulting service agreement, effective as of Sept. 1, 2026, with Lakefront Media LLC, for an initial period of one week, which may be extended for one or more additional one-week periods as determined by the company in its sole discretion.

Lakefront will assist in all aspects of a marketing campaign for the company, including, but not be limited to:

• Content and video development: headline development and image curation;
• SEO/PPC, double opt-in e-mail and SMS awareness;
• Web development: landing page creation, software set-up and configuration;
• Media buying and distribution: digital advertisement placement, sponsored article placement, native advertisement distribution, display advertisement distribution, push notification distribution and search engine marketing;
• Campaign reporting and optimization: analytical reporting, campaign bidding adjustments, campaign schedule adjustments and campaign budget allocation adjustments.

Lakefront is wholly owned by Matthew Shull, chief executive officer.

In consideration for the performance of the services by Lakefront, the company hereby agrees to compensate Lakefront as follows:

• A fee of $150,000 (U.S.) during the initial period for the services described and payable upon signature of the agreement.

The agreement is also subject to the acceptance of the TSX Venture Exchange.

Qualified person

The scientific and technical information contained in this news release was prepared under the supervision of and has been reviewed and approved by Christopher Richings, PEng, vice-president, technical services, of Goldgroup Mining, a qualified person as defined by National Instrument 43-101. Mr. Richings is an employee of the company and is not independent of the company.

About Goldgroup Mining Inc.

Goldgroup is a precious metal producer and growth-oriented mining company with four 100-per-cent-owned assets across Mexico and the United States.

The company owns and operates the Don David gold mine in Oaxaca, Mexico, and the Cerro Prieto gold mine in Sonora, Mexico, while advancing the San Francisco gold project in Sonora toward a potential production restart and the Back Forty project in Michigan toward development.

Goldgroup's strategy is focused on building a larger-scale intermediate precious metal producer through a combination of production growth, exploration, mine optimization, project development and disciplined capital allocation.

The company is listed on the TSX Venture Exchange and NYSE American under the symbol GORO and on the Frankfurt exchange under the symbol 55G0.

We seek Safe Harbor.