Auriginal Mining updates NI 43-101 Mineral Resource Estimate at Roger Project, Quebec

Auriginal Mining Corp. [TSXV: AUME] reported an updated NI 43-101 Mineral Resource Estimate for the Roger gold-copper porphyry deposit (the Roger Zone) at its 100%-owned Roger Project in the Chibougamau mining district of Quebec.

The estimate was prepared by independent qualified persons of PLR Resources Inc. Montreal, Quebec, and Evomine Consulting Inc, Beloeil, Quebec, with an effective date of September 13, 2026.

At a 0.22 g/t Au cut-off, the Roger Zone now hosts an Inferred Mineral Resource of 80.5 million tonnes grading 0.54 g/t Au, 0.40 g/t Ag and 0.04% Cu, containing 1,394,000 oz of gold, 1,046,000 oz of silver and 70.6 million lb of copper.

This compares with 297,000 oz of gold Indicated and 159,000 oz of gold Inferred in the 2018 historical estimate prepared for a previous operator. The increase in contained gold is driven by a revised three-dimensional interpretation of the deposit, a modern compiled drill database, a lower cut-off grade and current metal prices.

Phase 1 (10 holes, 7,325 m) and Phase 2 definition program (15 holes, 7,550 m) have extended the mineralized system to at least 1.4 km of strike length and more than 150 metres below the limits of the historical drilling – all of it outside the current resource model. These results, together with the Phase 3 program planned for 2027, will be incorporated in a further resource update targeted for the end of Q2 2027. The updated estimate therefore represents a new baseline for the Roger Project rather than the full extent of the opportunity.

“This estimate establishes a near 1.4-million-ounce Inferred gold resource at Roger and, just as importantly, it is built on historical drilling,” said Peter Cashin, CEO of Auriginal. “Our 2026 programs have already added roughly 14,875 metres of drilling that sits outside this model – including some of the highest-grade intersections ever returned on the property – and we have a defined pipeline of targets within and outside of the Roger Zone for Phase 3 in 2027. Our objective is to bring all of that into a further resource update by the end of the second quarter of 2027.”

“Chibougamau is one of the most active consolidation stories in Canadian mining today: IAMGOLD has assembled the Nelligan Mining Complex through its acquisition of Northern Superior, whose claims adjoin our northern boundary, and Central Asia Metals is acquiring the Cygnus copper-gold assets that adjoin us to the north and west. Roger is a 100%-owned, road-accessible gold-copper system five km from town with 1.39 million ounces of gold in Inferred Mineral Resources, and it is growing. That is a strategic position in this district.”

The previous NI 43-101 mineral resource estimate for the Roger Zone was prepared for Enforcer Gold Corp., a previous operator of the project, by Geologica Groupe-Conseil Inc. and GéoPointCom Inc. of Val-d’Or, Quebec (the 2018 historical estimate; effective date July 4, 2018; technical report dated October 9, 2018, by Alain-Jean Beauregard, P.Geo. and Daniel Gaudreault, P.Geo., filed on SEDAR on October 12, 2018) at a 0.45 g/t AuEq cut-off using a gold price of US$1,240/oz. It reported an Indicated resource of 10.9 million tonnes at 0.85 g/t Au, 0.80 g/t Ag and 0.06% Cu (297,000 oz gold) and an Inferred resource of 6.6 million tonnes at 0.75 g/t Au, 1.18 g/t Ag and 0.11% Cu (159,000 oz gold).

The two estimates are not directly comparable: the 2018 estimate used a higher gold-equivalent cut-off and a gold price less than one-third of the US$3,750/oz used today, and the 2026 estimate reflects a revised interpretation of the geometry and continuity of mineralization.

The increase in contained gold is principally the result of a substantially larger mineralized envelope (80.5 million tonnes Inferred, versus 10.9 million tonnes Indicated and 6.6 million tonnes Inferred in 2018) at a lower cut-off grade and lower average grade.

All material previously classified as Indicated is now classified as Inferred, reflecting the change in modeling approach and confidence level adopted by the Qualified Person. A qualified person has not done sufficient work to classify the 2018 historical estimate as current mineral resources, and Auriginal is not treating it as current mineral resources. The 2018 historical estimate has been superseded by the current MRE and is presented for comparison purposes only.

The Roger Zone is a porphyry-style gold-copper deposit associated with a felsic sill and dyke system intruding mafic and felsic volcanic and pyroclastic rocks of the Bruneau Formation. The resource is defined by historical diamond drilling over a strike length of approximately 1,000 metres to a vertical depth of approximately 500 metres, with mineralized drill intersections ranging from 10.7 metres to 192.6 metres in length (true thickness of up to approximately 125 m).

Mineralization remains open along strike and at depth. The 2026 drilling has extended the system to at least 1.4 km of strike and identified a gold-rich VMS horizon overlying the porphyry, neither of which is reflected in the current estimate. Additional gold-copper targets on the property remain to be drill-tested.

Auriginal’s 2026 drilling was designed to test the depth and strike extensions of the Roger Zone and the gold-rich volcanogenic massive sulphide (VMS) horizon that overlies it. Phase 1 (10 holes, 7,325 m) was completed in the first half of 2026 and Phase 2 (15 holes, approximately 7,300 metres, fully funded) is nearing completion.

Selected results previously reported by the company include 125.3 metres at 0.67 g/t gold and 0.09% copper, 45.5 metres at 1.05 g/t gold, 19.5 metres at 1.51 g/t gold. Refer to original press release for complete assays. Intervals are core lengths; true widths are estimated at approximately 65% of core length.

These holes indicate that the porphyry gold-copper system continues well below the current resource model and along strike in both directions, and that it remains open. Phase 2 was drilled at approximately 125 metres spacing across the new extensions with the objective of supporting Inferred classification in the next resource update. Assays from the remaining Phase 2 holes, including AUR-26-20 in which visible gold was observed, are pending.

A Phase 3 geophysical and diamond drilling program planned for 2027 will focus on expanding the Roger porphyry deposit at depth and along strike; completing infill and step-out drilling of the extensions and on the VMS horizon, which has been traced over at least 1.5 km of strike and testing new targets generated outside of the Roger resource footprint.

The Roger Project covers 987 hectares, 5 km from the town of Chibougamau, with all-season road access and nearby grid power. The Chibougamau-Chapais camp has produced an estimated 4.0 million ounces of gold and 2.7 billion pounds of copper and is served by established infrastructure including a regional airport, a skilled local workforce and the Copper Rand processing facility.

The district has attracted significant investment and consolidation by larger producers over the past 12 months.

Richard (OGQ #1119) verified the database supporting the MRE by visiting the Project on October 2, 2026, checking a reasonable percentage of the database against original assay certificates; independent check sampling of 15 core samples; and review of collar, downhole survey and lithology data. Some of the historical drillholes lack QA/QC data. In the opinion of the QP, the data are adequate for the purposes of the MRE. The QP has not done sufficient work to classify the 2018 historical estimate as current mineral resources, and Auriginal is not treating it as current mineral resources. The 2018 historical estimate has been superseded by the current MRE and is presented for comparison purposes only. An assumption that the categories of the historical estimate are compatible to current CIM Definition Standards has been made.

Auriginal is a Quebec-focused copper and gold exploration company with one of the province’s largest and most diversified exploration portfolios. Its 100%-owned flagship Roger Project, 5 km from Chibougamau, hosts a gold-copper porphyry deposit with an Inferred Mineral Resource of 80.5 million tonnes at 0.54 g/t Au (1.39 million ounces of gold), and an overlying gold-rich VMS horizon. Supported by a pipeline of greenfield projects across Quebec’s established mining regions and the Ore Group’s exploration and capital markets team, Auriginal is focused on discovery and resource growth in copper, gold and zinc.