Announcement • Sep 03

Midnight Sun Mining Corp. Initiates Phase Two Exploration Program At Dumbwa Copper Deposit

Midnight Sun Mining Corp. has announced the commencement of its Phase Two exploration program at the Company’s wholly-owned Dumbwa copper deposit in Zambia. Phase Two represents the transition from the successful systematic evaluation of the Dumbwa mineralized corridor undertaken during Phase One, to a highly targeted exploration strategy designed to identify and expand higher-grade zones of copper mineralization, extend known mineralization laterally and along strike, and test newly identified prospective structures outside the currently defined corridor. The Phase Two program will integrate high-resolution ground magnetics, dipole-dipole induced polarization geophysics, soil geochemistry, and diamond drilling. Phase One drilling remains underway and is expected to be completed by the end of Third Quarter 2026. Applying this new targeted approach, drilling has shifted to the northern block, where wider step-outs are designed to rapidly identify additional zones of higher-grade copper mineralization throughout the initial 11.5 km Dumbwa corridor. The systematic nature of Phase One has generated an extensive geological, geochemical and geophysical dataset across the tested portion of the Dumbwa system. Drilling has defined distinct blocks of enhanced copper mineralization along the north-south corridor, including several higher-grade domains within the broader mineralized system. Phase Two intends to leverage this growing dataset to focus drilling on the highest-priority targets, both within the Dumbwa mineralized corridor and along prospective structures to the east and west. The Company will also extend selected existing drill fences beyond the presently tested east-west limits of known mineralization. Midnight Sun commenced Phase One exploration at Dumbwa on August 6th, 2025, with the objective of methodically and systematically testing the Dumbwa mineralized corridor to establish the geological and structural framework necessary to guide subsequent exploration. The Phase One program included IP and ground magnetic geophysics, along with geochemical soil sampling, and extensive diamond drilling along the initial 11.5 km of the approximately 20 km Dumbwa copper-in-soil anomaly. Drilling to date has employed a systematic fence-drilling approach, with drill holes generally spaced at approximately 50 m intervals across the main copper-in-soil anomaly and drill fences spaced from 100 m to 200 m apart along the north-south strike. Drilling began at the southern property boundary and has progressively advanced northward. The Company has developed and integrated an extensive exploration dataset that includes IP geophysical coverage along the initial 11.5 km of the Dumbwa system; geochemical soil sampling designed, in part, to supplement and correlate with historical geochemical datasets; and initial high resolution ground magnetics to identify new drill targets both east and west of the main Dumbwa mineralized corridor. This systematic approach has provided the Company with much greater geological resolution across Dumbwa and has demonstrated that copper mineralization is not distributed uniformly throughout the main mineralized corridor. Rather, a pattern of grade zonation has emerged along strike, so far defining four areas of more intense copper mineralization within the broader system. These higher-grade areas, combined with the geological, structural, geophysical and geochemical information generated during Phase One, provides the foundation for the Company's Phase Two targeting strategy. Phase Two is designed to build upon the geological framework established during Phase One and pursue two principal exploration objectives: Expand the Dumbwa mineralized system northward through the identification of best targets and testing the continuity of the main mineralized corridor; and Identify opportunities to expand higher-grade copper mineralization, both within the previously drilled portions of the main Dumbwa mineralized corridor and in potential satellite mineralized targets to the east and west. The program will combine four complementary exploration tools: high-resolution ground magnetics and IP geophysics, soil geochemistry, and targeted diamond drilling. The integration of these exploration datasets is designed to sharpen the Company’s understanding of Dumbwa and effectively identify and test the most compelling targets for drilling. An extensive high-resolution ground magnetic survey is underway at Dumbwa and has become an important component of the Company's Phase Two targeting strategy. Historical airborne magnetic data collected in 1997 identified a north-south trending magnetic unit associated with the central portion of the Dumbwa mineralized corridor. Subsequent drilling has demonstrated a relationship between this geophysical feature, the geological and structural architecture at Dumbwa, and known copper mineralization. To improve the understanding of this relationship and establish correlation with known results, Midnight Sun completed an initial high-resolution ground magnetic survey over an area of Dumbwa, approximately 2.5 km by 2.7 km, which had already been drilled. Data was collected along north-south survey lines spaced 100 m apart, with east-west tie lines spaced at 250 m intervals. This initial survey successfully identified the ‘fingerprint’ of high-grade copper mineralization; distinct magnetic signatures associated with areas of drill-confirmed copper mineralization. Importantly, similar magnetic signatures have also been identified outside the currently known Dumbwa mineralized corridor in areas that have not yet been drill tested. Based on these results, Midnight Sun is expanding the high-resolution magnetic survey north and south to cover the full ~20 km extent of the Dumbwa copper-in-soil anomaly. The expanded survey has three main objectives: Refine the geological and structural interpretation of the known Dumbwa mineralized corridor; Identify additional prospective zones along parallel and sympathetic structural corridors; and, Improve the Company's ability to target potential higher-grade copper mineralization.

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