Casa Minerals Commences Inaugural Diamond Drilling at the Arsenault Copper-Gold-Silver Project, British Columbia

Casa Minerals Inc. (TSXV: CASA) (OTCQB: CASXF) (FSE: 0CM) (the "Company" or "Casa") is pleased to announce that diamond drilling has commenced at its Arsenault copper-gold-silver volcanogenic massive sulphide ("VMS") project (the "Property" or "Arsenault"), located in the Jennings River area of northern British Columbia, approximately 130 kilometres east-northeast of Atlin, BC, near the Yukon border. This is the first drilling ever carried out by Casa at Arsenault and one of the first modern drill tests of the Arsenault VMS system.

The first hole of the program is collared on IP survey Line 15E at UTM coordinates Easting 347,110 mE and Northing 6,632,206 mN (UTM Zone 9N). The hole is oriented at an azimuth of 045° (N45°E) with a dip of -85° - a near-vertical attitude selected to intersect, at relatively shallow depth, the sub-vertical chargeability and resistivity feature defined by the Company's 2025 ground induced polarization ("IP") survey. The collar is positioned directly over a first-priority IP anomaly characterized by strong chargeability and low-to-moderate resistivity, coincident with an interpreted fault/contact - the geophysical signature the Company considers most prospective for massive sulphide mineralization on the Property (Figure 1).

Drill targets for the inaugural program were generated by integrating property-scale geological mapping, surface rock and soil geochemical sampling, the Company's large database of historic exploration data, the 2017 airborne VTEM survey that originally outlined five VMS targets on the Property, and - most importantly - the three-dimensional inversion products of the 2025 ground IP survey. The Company's technical team ranked the resulting anomalies on the combined strength of chargeability, resistivity, structural setting and geological/geochemical support, and has scheduled the first holes of the program on the highest-ranked targets. The first-priority targets exhibit strong chargeability responses coincident with low resistivity, a combination characteristic of, though not diagnostic of, massive sulphide mineralization.

The 2025 program, completed by Simcoe Geoscience Limited ("Simcoe") between September 1 and 24, 2025, employed the Alpha IP™ wireless time-domain distributed IP system using a dipole-pole-dipole array configuration with 100-metre station spacing and 200-metre line spacing. Fifteen (15) profiles were acquired for a total of 34.5 line-kilometres, with a depth of investigation of 500 metres or more. The survey was designed to map chargeability and resistivity features associated with potential copper, gold and silver mineralization in the Big Salmon volcano-sedimentary sequence that hosts the Arsenault VMS system. The survey identified 71 discrete anomalies: 29 first-priority targets exhibiting strong chargeability and low resistivity; 24 second-priority targets with moderate chargeability and resistivity; and 18 deeper-seated third-priority anomalies, some of which appear to be depth extensions of the shallower targets. Six northwest-southeast trending anomalous corridors were identified, following the regional structural grain and associated with interpreted faults and geological contacts. A major inferred fault running through the centre of the survey area separates a southwestern domain of strong to moderate chargeability coincide...