# Midnight Sun Extends Dumbwa Copper Deposit to Over 5.3 Kilometres; Remains Open Along Strike with Drilling Ongoing *2026-05-13T06:30:00-04:00* Midnight Sun Extends Dumbwa Copper Deposit to Over 5.3 Kilometres; Remains Open Along Strike with Drilling Ongoing ## Results include: 93m @ 0.40% Cu, 80m @ 0.39% Cu, 44m @ 0.53% Cu, and 36m @ 0.58% Cu VANCOUVER, British Columbia, May 13, 2026 (GLOBE NEWSWIRE) -- Midnight Sun Mining Corp. (TSXV: MMA / OTCQX: MDNGF) (“Midnight Sun” or the “Company”) is pleased to report results from drillholes completed on its wholly owned Dumbwa copper deposit, located in Solwezi, Zambia. Dumbwa is in the southeast portion of the Company’s Solwezi Project, centered in the heart of the prolific Domes Region - flanked to the north by First Quantum’s Kansanshi mine and west by Barrick’s Lumwana mine. Drilling has now surpassed 200 holes for a total of over 42,000 metres (“m”) and results to date confirm near surface copper sulphide mineralisation, over a continuous strike length of 5.3 kilometres (“km”) (_see Figures 2 and 3_), with assays received for the first ~4km of drilled strike. The initial discovery and delineation drill program continues with 4 rigs focussed on growing the deposit to the north along strike and to extend previously drilled mineralisation east and west. Quality control issues related to laboratory analysis have been resolved, and the related backlog of assays are now largely caught up (_see below_). The Company plans to host a technical webinar with Midnight Sun’s COO, Dr. Kevin Bonel, to discuss the results announced in this news release. Details will be included in a separate news release. Top 20 Drill Highlights: | **Hole ID** | | **From (m)** | **To (m)** | **Interval (m)** | **Cu (%)** | | --- | --- | --- | --- | --- | --- | | DBW-25-099R | | 58 | 60 | 2 | 0.54 | | | **152** | **245** | **93** | **0.40** | | | DBW-25-123 | | 29 | 33.78 | 4.78 | 0.31 | | | 59 | 67 | 8 | 0.44 | | | | **127** | **207** | **80** | **0.39** | | | DBW-25-036 | | **0** | **44** | **44** | **0.53** | | and | 119.54 | 137 | 17.46 | 0.37 | | | DBW-25-111 | | 52 | 57 | 5 | 1.75 | | | 63 | 79 | 16 | 0.35 | | | | **132** | **221** | **89** | **0.25** | | | DBW-25-122 | | 11 | 20.6 | 9.6 | 0.18 | | | 77 | 91 | 14 | 0.19 | | | | **106** | **142** | **36** | **0.58** | | | including | 127 | 142 | 15 | 1.03 | | | | **171** | **238** | **67** | **0.30** | | | DBW-25-147 | | 0 | 17 | 17 | 0.20 | | | **41** | **102** | **61** | **0.34** | | | including | 41 | 47 | 6 | 1.30 | | | | 82 | 85 | 3 | 1.38 | | | | 111 | 126 | 15 | 0.27 | | | | 154 | 168.05 | 14.05 | 0.51 | | | | 182 | 183 | 1 | 1.34 | | | DBW-25-064 | | **0.7** | **47** | **46.3** | **0.42** | | DBW-25-114 | | 26 | 32 | 6 | 0.21 | | | | **43** | **87** | **44** | **0.37** | | | | 122 | 208.5 | 86.5 | 0.15 | | DBW-25-149 | | **23** | **40.84** | **17.84** | **0.85** | | Including | 31 | 39 | 8 | 1.71 | | | | 50.58 | 72 | 21.42 | 0.38 | | | | 171 | 197.65 | 26.65 | 0.38 | | | DBW-25-110 | | **42** | **77** | **35** | **0.36** | | | 89 | 102 | 13 | 0.34 | | | | 145 | 154 | 9 | 0.20 | | | DBW-25-065 | | 91 | 98 | 7 | 0.16 | | | **127** | **163** | **36** | **0.33** | | | DBW-25-106 | | 38 | 43 | 5 | 0.19 | | | 59 | 67 | 8 | 0.4 | | | | **173** | **210** | **37** | **0.31** | | | DBW-25-031 | | 27 | 36 | 9 | 0.34 | | | **119** | **142** | **23** | **0.49** | | | | 160 | 181 | 21 | 0.34 | | | DBW-25-037 | | **0** | **42** | **42** | **0.25** | | DBW-25-127 | | **42** | **72** | **30** | **0.32** | | | 96 | 107 | 11 | 0.53 | | | | 174.95 | 180 | 5.05 | 0.29 | | | DBW-25-117 | | 42 | 46 | 4 | 0.51 | | | **67** | **95** | **28** | **0.30** | | | | 103 | 109 | 6 | 0.19 | | | | 143 | 182 | 39 | 0.15 | | | DBW-25-120 | | 13 | 19 | 6 | 0.54 | | | **89** | **144.5** | **55.5** | **0.15** | | | | 164 | 172 | 8 | 0.46 | | | DBW-25-108 | | **10** | **51** | **41** | **0.20** | | | 106 | 153 | 47 | 0.14 | | | DBW-25-054 | | 14 | 20 | 6 | 0.19 | | | **37** | **54** | **17** | **0.47** | | | including | 37 | 38 | 1 | 5.94 | | | | 64.3 | 66 | 1.7 | 0.57 | | | | 79 | 86 | 7 | 1.01 | | | DBW-25-148 | | 72.2 | 78 | 5.8 | 0.18 | | | 86 | 102 | 16 | 0.17 | | | | 119 | 139.7 | 20.7 | 0.17 | | | | **169** | **190** | **21** | **0.33** | | - Assay results based on four-acid digest, ICP-OES finish. Intervals listed are based on drilling intervals and therefore are considered relative rather than true widths. - The full table of assays including locations is available on the Company’s website and can be accessed through this link: [_Dumbwa Drill Hole Location and Assay Table_](https://midnightsunmining.com/wp-content/uploads/26.05.13-MMA-Dumbwa-Drill-Hole-Table-v3.0.pdf). “What began as a geological concept has now been established as a significant discovery, with over 5.3km of strike now tested and supported by more than 40,000m of drilling. Our team is rapidly defining what is emerging as an exceptionally large, near-surface, structurally controlled copper sulp