Highlights:

• 125.3 m grading 0.67 g/t Au, including 20.0 m at 1.94 g/t Au, returned in hole AUR-26-07, the widest intercept of the program to date, extending the Roger zone by at least 125 metres at depth

• Near-surface copper-gold confirmed: 34.5 m of 0.69 g/t Au and 0.14% Cu from just 70.5 m downhole in AUR-26-06

• High-grade gold at depth: 50.4 g/t Au over 0.5 m at 572.7 m and 9.1 g/t Au over 2.5 m at 596.0 m in AUR-26-06 and 12.2 g/t Au over 1.1 m in AUR-26-05, demonstrating the high-grade endowment persists throughout the system

• Phase 1 drilling complete: 10 holes totaling 7,325 m have expanded the Roger mineralized footprint approximately 700 m southwest, 400 m northeast, and more than 100 m at depth, growth that will be captured in the revised Mineral Resource Estimate now underway

• The Roger is characterized as wide anomalous copper- and gold-bearing sulphide intervals over hole lengths of 200-250 m in all holes, commencing near surface.

• Phase 2 drilling is now on the fourth hole of a 12-hole, 6,400 m drill program

Toronto, Ontario--(Newsfile Corp. - September 1, 2026) - Auriginal Mining Corp. (TSXV: AUME) ("Auriginal" or the "Company") is pleased to report that encouraging results continue to be returned from Phase 1 Roger diamond drilling. The new results, in combination with our Phase 2 definition drilling, will supplement an expanded Mineral Resource for the historical Roger Zone being undertaken.

The new assays continue to demonstrate the two features that define Roger's investment case, exceptional width and consistent grade near surface, punctuated by high-grade gold. Hole AUR-26-07 returned the standout intercept of the program to date, 125.3 m grading 0.67 g/t Au from 346.0 m, including 20.0 m at 1.94 g/t Au, this single intersection extends the Roger zone by at least 125 metres at depth.

Higher in the system, AUR-26-06 cut 34.5 m of 0.69 g/t Au and 0.14% Cu beginning just 70.5 m downhole, including 6.0 m at 1.85 g/t Au and 0.34% Cu, confirming that meaningful copper-gold mineralization starts near surface. AUR-26-05 added 23.5 m of 1.12 g/t Au, including a high-grade interval of 12.2 g/t Au over 1.1 m, while late intercepts of 50.4 g/t Au over 0.5 m at 572.7 m and 9.1 g/t Au over 2.5 m at 596.0 m depth in AUR-26-06 demonstrates that the high-grade gold endowment persists well below the historical resource.

Each hole reported intersected mineralization over broad intervals, the system remains open in all directions, and each of these intercepts falls above the 0.2 g/t Au cut-off being applied to the revised Mineral Resource Estimate, meaning this drilling is not just extending the geology, it is directly adding to the resource base currently being calculated.

"Drilling continues to support our view of a significantly expanded porphyry Cu-Au resource at Roger below and along strike from historical drilling on the property and has confirmed the presence of an overlying gold-rich VMS horizon," said Peter Cashin, Auriginal Mining Corp's CEO. "We are seeing strong mineralization in all holes, which remains open below and to the southwest and northeast of the previous limits of Roger zone. Phase 2 drilling is well underway and is showing some of the strongest sulphide mineralization observed to date."

• Figure 1 - Resource Map of the Chibougamau-Chapais Mining Region, Eastern Abitibi Belt, Quebec

• Figure 2 - Plan Map of Phase 2 Drillhole Locations, Roger Project, Quebec

• Figure 3 - Proposed Phase 2 Definition Drillhole Intercepts, Longitudinal Section, Roger Project, Looking South

Register now: Live webinar with CEO Peter Cashin on today's results, Thursday at 1:00 p.m. ET

.Phase 1 Drilling Expands Roger Mineralized Footprint

Auriginal's Phase 1 drilling program was designed to test extensions of the historical Roger copper-gold mineralization and further evaluate the Company's geological interpretation of the broader mineralized system. Drilling to date has extended the known porphyry-style mineralization approximately 700 metres southwest and 400 metres northeast of the historical drilling limits, while also extending the depth limits of mineralization by more than 100 metres. The Roger mineralized system remains open in all directions. A total of ten drillholes for 7,325 m were completed in this Phase of the Roger program.

Assays for the holes AUR-26-05 to -07 are herein reported (see Table 1):

Table 1 - New assays from Phase 1 received from Holes AUR-26-05 through AUR-26-07 returned:

Roger: At the Centre of a Major Mining Resurgence*

Auriginal Mining's Roger Project is surrounded by a growing concentration of large, advanced mineral resources in the Chibougamau-Chapais district (see Figure 1). The historic mining camp has produced more than 6.5 Moz of gold and 1.6 billion lbs of copper and is attracting renewed investment from major international mining companies.

Nearby projects include:

• Nelligan Mining Complex - IAMGOLD: 4.3 Moz Indicated + 7.5 Moz Inferred gold

• Croteau East Project - IAMGOLD: 640,000 oz. Inferred gold

• Chibougamau Project - Central Asia Metals: 14.9 Mt @ 3.3% Cu_Eq

• Windfall - Gold Fields: 7.4 Moz gold resources, including 4.1 Moz M&I

• Opemiska - XXIX Metals Corp.: 2.4 billion lbs. @ 0.74 % Cu_Eq

(* - References: IAMGOLD, Fourth Quarter and Year-End 2025 Results, Central Asia Metals plc news release, June 2, 2026, "Proposed acquisition of Cygnus Metals Limited by Central Asia Metals PLC for A$232 million", Cygnus Metals press release, September 16, 2025 - "Cygnus reports a 78% increase in M&I resource at its Chibougamau Copper-Gold Project", Gold Fields Limited press release, October 28, 2024, "Gold Fields acquires 100% of Osisko Mining to consolidate ownership of Windfall Lake", Gold Fields Limited Year-End Financial Results December 31, 2024., Northern Superior website, 2015 MRE, XXIX Metals, Opemiska PEA, October 2025).

This concentration of substantial gold and copper resources underscores the scale and strategic importance of the mineral district surrounding Roger, providing Auriginal with exposure to a rapidly re-emerging Québec mining camp.

$2.0 Million Phase 2 Definition Drill Program Underway

Following the expansion demonstrated during Phase 1, Auriginal has allocated an additional $2.0 million to Phase 2 definition drilling at Roger. The program is designed to provide sufficient drill density across the newly identified extensions of the Roger mineralized system to support their potential inclusion in a future MRE. Based on PLR's initial review, drilling at approximately 125-metre spacing has been recommended across portions of the newly defined mineralized extensions to support evaluation for potential classification within an Inferred Mineral Resource.

The Company expects the broader resource work incorporating the expanded drilling footprint to follow the October update, with additional resource work tentatively targeted for later in 2026 or early 2027. All currently planned Phase 2 drilling and associated technical work is fully funded.

The Phase 2 drilling is currently of the fourth hole of a twelve-hole, 6,250 m program (see Figure 2). The drilling is planned to intersect the Roger porphyry zone above the Phase 1 drilling at the 375 m and 150 m vertical level (see Figure 3). Some of the strongest pyrite-chalcopyrite mineralization was intersected (see Plates 1 & 2, Hole AUR-26-12 from 170.0 to 224.0 m) . This new drill core will be sent to our lab for analysis soon.

• Plate 1 - Bedded Pyrite-Chalcopyrite-Sphalerite

• Plate 2 - Stringer Pyrite-Chalcopyrite

About Auriginal Mining Corp.

Auriginal is a Quebec-focused copper and gold company with one of the province's largest and most diversified exploration portfolios. Its 100%-owned flagship Roger Project, located in the Chibougamau district, hosts a known gold-copper deposit with strong potential to host volcanic-hosted polymetallic massive sulphide deposits. With a diversified pipeline of greenfield projects across Quebec's best-known mining regions and backed by the Ore Group's proven exploration and capital markets team Auriginal has a clear focus on discovery and growth for copper, zinc and gold. The company is well-positioned to immediately execute an aggressive exploration and acquisition strategy and attract broader market attention. Further details on Auriginal are available on the company website at https://auriginal.ca/.

Qualified Person Statement

The technical information contained in this news release has been reviewed and approved by Michel Leblanc, géo.(613), an Independent Consultant to Auriginal Mining Corp. and a Qualified ‎Person as defined in "NI 43-101".

Cautionary Statement

Certain information set forth in this news release contains forward-looking statements or information ("forward-looking statements)", including details about the business of Auriginal Mining. All statements in this news release, other than statements of historical facts, that address events or developments that Auriginal Mining expects to occur, are forward-looking statements. By their nature, forward-looking statements are subject to numerous risks and uncertainties, some of which are beyond the Auriginal Mining's control, including the impact of general economic conditions, industry conditions, volatility of commodity prices, currency fluctuations, environmental risks, operational risks, competition from other industry participants, stock market volatility. Although the Company believes that the expectations in its forward-looking statements are reasonable, its forward-looking statements have been based on factors and assumptions concerning future events which may prove to be inaccurate. Those factors and assumptions are based upon currently available information. Such statements are subject to known and unknown risks, uncertainties and other factors that could influence actual results or events and cause actual results or events to differ materially from those stated, anticipated or implied in the forward-looking statements. Accordingly, readers are cautioned not to place undue reliance on the forward-looking statements, as no assurance can be provided as to future results, levels of activity or achievements. Risks, uncertainties, material assumptions and other factors that could affect actual results are discussed in Auriginal Mining's public disclosure documents available at www.sedarplus.ca. Furthermore, the forward-looking statements contained in this document are made as of the date of this document and, except as required by applicable law, Auriginal Mining does not undertake any obligation to publicly update or to revise any of the included forward-looking statements, whether as a result of new information, future events or otherwise. The forward-looking statements contained in this document are expressly qualified by this cautionary statement.

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

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