Cadillac Mines Extends Kerr-Addison Mineralization Over 350 Metres East of the 2026 Resource Open Pit; Significant Results Include 1.50 Grams per Tonne Gold Over 14.4 Metres

Drilling through the eastern margin of the Kerr Open Pit and east of the 2026 Mineral Resource Estimate pit has defined mineralization from near surface to 300 metres depth in an area with limited previous drilling, strongly supporting an eastward extension of the open pit

TORONTO, Ontario, Sept. 21, 2026 (GLOBE NEWSWIRE) — Cadillac Mines Corporation (TSX: CADY ), (“ Cadillac Mines ” or the “ Company “) is pleased to announce assay results from expansion diamond drilling at the Chesterville East Extension (“CVE”) at Kerr-Addison (“KA”), located in Virginiatown, Ontario. Results are reported for a total of 68 drill holes from an ongoing property-wide infill and expansion diamond drill program.

Today’s release includes assay results from 68 drill holes totaling 28,304 metres of a planned 30,500 metres of expansion drilling at CVE, east of the former Chesterville Mine and the 2026 Mineral Resource Estimate (“MRE”) resource pit. All assay results reported in this release were received after the cut-off date for the 2026 MRE and were not used in that mineral resource estimate.

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Rick Howes, Chief Executive Officer of Cadillac Mines, stated, “These results open up an area east of the 2026 MRE resource pit that had seen very little drilling previously, clearly demonstrating that the mineralization defined within the Kerr Open Pit continues well beyond the pits eastern limit.” Mr. Howes continued, “This new mineralization is in an area that is not within our current mineral resource, and with continued drilling gives us a real opportunity to grow the Kerr open pit.”

The Kerr-Addison Deposit is an Archean orogenic gold system located in the Abitibi Greenstone Belt. It is spatially associated with the Larder Lake Cadillac Deformation Zone (LLCDZ), a major crustal fault that acted as a conduit for hydrothermal fluids and controlled the emplacement of gold mineralization. The Kerr Fault, a steeply north dipping subsidiary splay of the LLCDZ, strikes eastward across the property and is taken as the boundary between the hangingwall to the north and the footwall panels to the south. There are five main mineralized domains that host the Kerr mineralization: Green Carbonate and Flow domains, which constitute the Main Break mineralization that accounted for over 10 million ounces of historical gold production, and the Footwall (Chesterville or CVE), Albitic and Graphitic domains which accounted for under 0.5 Moz of historic production.

The holes highlighted in this news release were drilled east of the former Chesterville Mine, targeting the eastward continuation of the footwall panels in an area that had seen very little previous drilling. Drilling in this target area began in the fourth quarter of 2025 and the initial results made this a focus of the 2026 program. These results demonstrate that the mineralization continues east of the former Chesterville workings, from within the eastern margin of the 2026 MRE resource pit to approximately 350 metres east of it, and that mineralization is present through the full vertical section on the eastern margin.