Seabridge Gold Inc. reported on the Bronson Slope drilling program at its 100% owned Iskut property in Northwestern B.C.'s Golden Triangle. Results are confirming an extensive area of magmatic-hydrothermal alteration sourced from the high fluid flux of a porphyry mineral system that generated the unusually large explosive breccia pipe discovered in 2022 and the intermediate epithermal occurrence that expands the known Bronson Slope copper-gold deposit. The 2023 Bronson Slope program was designed to evaluate simultaneously the potential to expand the Bronson Slope resource and test at depth for its source.

Results identified broad zones of sericite-pyrite-carbonate alteration associated with continuous low gold grades.Superimposed on this upper zone of thermally metamorphosed rock is a hydrothermal alteration including pyrrhotite-biotite-sericite and abundant carbonate tension gashes. Localized areas in this part of the system contain abundant sphalerite. This alteration style gives way to a lower zone of intensive sericite-pyrite-carbonate where gold grades are extensive.

This lower zone shows limited thermal metamorphism, possibly due to the intense texturally destructive alteration. Narrow zones of nearly massive sulfide (from 60% to 95% sulfide minerals) contain pyrite, sphalerite, chalcopyrite, galena and bornite which likely represent feeder structures. This discovery touches on one of the enduring enigmas of the Iskut property: the McFadden boulder field, a train of large, massive sulfide boulders with ultra-high base and precious metal grades which, until now, has had no counterpart to in-place mineralization.

Results to date are early stage, however most of the zones have been intercepted perpendicular to bedding that may have provided a primary control on the true width of the epithermal mineralization. Establishing the orientation of the mineral zones is still in progress; additional studies and drilling are required to confirm true widths of mineralization. An ongoing and rigorous quality control/quality assurance protocol is employed in all Seabridge exploration campaigns.

This program includes inserting blind blank, duplicate and certified reference standards into the laboratory submissions. Assays methods were a 30-gram FA in conjunction with 35 element ICP-ES, at Bureau Veritas laboratory in Vancouver B.C. Cross-check analyses are conducted at a second external laboratory on at least 10% of the drill samples. Exploration activities by Seabridge at the Iskut Project are being conducted under the supervision of William E. Threlkeld, Registered Professional Geologist, Senior Vice President, Exploration of the Company and a Qualified Person as defined by National Instrument 43-101.

Mr. Threlkeld has reviewed and approved this news release.