Midnight Sun's Dumbwa Copper Deposit More Than Doubles in Width to Over 2.4 km in Northern Block

Midnight Sun Mining Corp. (MMA) has released results from 76 diamond drill holes totaling 17,373 meters, drawn from both expansion and delineation programs. The company reports that recent drilling in the Northern Block intersected near-surface copper sulphide mineralization across an east-west extent exceeding 2,400 meters, a distance it describes as more than double the average width of the previously drilled Dumbwa Mineralized Corridor.

The full assay and location table for all 76 holes is available on the company website, while the press release highlights 14 specific intercepts. These reported downhole copper percentages include:

• DBW-26-283 — 59.0–90.1 m: 31.1 m @ 0.47% Cu, including 70.0–86.0 m: 16.0 m @ 0.81% Cu (Northern)
• DBW-26-261 — 13.0–24.0 m: 11.0 m @ 0.67% Cu (Central North)
• DBW-26-355 — 80.0–87.0 m: 7.0 m @ 1.05% Cu (Central)
• DBW-26-266 — 52.0–66.0 m: 14.0 m @ 0.48% Cu and 83.0–88.0 m: 5.0 m @ 0.44% Cu (Southern)
• DBW-26-217 — 208.0–212.0 m: 4.0 m @ 0.90% Cu (Central North)
• DBW-26-238 — 82.2–88.6 m: 6.4 m @ 0.42% Cu (Central North)
• DBW-26-241 — 168.0–182.0 m: 14.0 m @ 0.26% Cu, incl. 7.0 m @ 0.39% Cu (Central North)
• DBW-26-346 — 208.0–213.0 m: 5.0 m @ 0.39% Cu (Central)
• DBW-26-348 — 28.0–51.0 m: 23.0 m @ 0.32% Cu (Northern)
• DBW-26-359 — 9.0–16.0 m: 7.0 m @ 0.41% Cu and 24.0–35.0 m: 11.0 m @ 0.26% Cu (Northern)
• DBW-26-356 — 3.0–24.0 m: 21.0 m @ 0.28% Cu (Northern)
• DBW-26-282 — 16.0–41.0 m: 25.0 m @ 0.22% Cu (Southern)
• DBW-26-257 — 6.0–35.0 m: 29.0 m @ 0.20% Cu (Central North)
• DBW-26-230 — 10.0–33.0 m: 23.0 m @ 0.12% Cu (Central North)

The completion of this batch brings the Phase One field programme to 372 diamond holes and more than 87,000 meters. This total defines copper sulphide mineralization along more than 12 kilometers of the Dumbwa corridor within a broader approximately 20-kilometer soil and geophysical anomaly. Of the total, 214 holes (44,941 meters) had been previously reported, while the 76 holes detailed in this release imply that roughly 80 additional holes have been drilled but not yet reported.

Assay processing remains ongoing, with approximately 5,000 samples representing about 70 holes still outstanding. Of these, 1,824 samples have been received in Perth for priority analysis, with results targeted by October 30. Additionally, 1,000 samples have been moved to Johannesburg, while 859 remain at Intertek Kitwe. Intertek plans to commission replacement pulverizers and an additional crusher at Kitwe by December 1, 2026.

The company stated it has "encountered multiple and repeated reporting failures provided by the independent laboratories," noting that some holes reported today had previously failed its internal QA/QC and were not released earlier. Qualified Person Darin Labrenz, P.Geo., verified the data, noting that true width is estimated at 85–100% of the drill-indicated thickness. No cutoff grade was stated in the release.

Midnight Sun Mining Corp. (MMA) remains a pre-resource explorer, with its Dumbwa project lacking a mineral resource estimate. The company’s only compliant resource is the small Kazhiba Main oxide MRE, which contains 2.33 million tonnes at 1.41% copper, equating to 72.3 million pounds of contained copper. With a market capitalization of approximately C$87 million, 217.6 million shares outstanding, and C$18.2 million in cash, the company is well-funded but still in the early exploration stage where scale claims are typically priced.

The latest release marginally expands the perceived scale of the system. A greater than 2.4 km east-west mineralized extent was identified in the Northern Block at surface, with a true width of 85–100%. This width roughly doubles the prior description of a 600–1,000 m corridor. However, the intercepts supporting this width are lower grade, ranging from 0.12–0.48% copper over 5–31 meters, with only two sub-intervals exceeding 0.8% copper. The grade-thickness of these new results is weaker than previously published high-grade holes, which recorded 37 %·m, 31 %·m, and 23 %·m, compared to 14.6 %·m in the current release.

The last clearly market-moving drilling result occurred on 13 May 2026, when the company reported 5.3 km of strike, including DBW-25-099R at 93 m @ 0.40% copper and DBW-25-123 at 80 m @ 0.39% copper. Following that announcement, the stock fell from $1.42 to $1.03, and subsequently to $0.40. The market has de-rated the stock through every subsequent drilling release; for instance, a 6.7 km strike announcement on 29 June barely moved the price, which fell from $0.75 to $0.63 over the following fortnight. Consequently, the current result, which confirms a large, low-grade, near-surface system continues north, does not alter the resource thesis, the grade thesis, or the odds. It defers the real information, including the approximately 70 outstanding holes and an eventual resource estimate, to later dates.

Midnight Sun Mining Corp. (TSXV: MMA) is a Vancouver-based copper explorer operating in the Zambia–Congo Copperbelt near Solwezi. The company’s flagship asset is the Dumbwa project, a 100%-owned, basement-hosted, strain-controlled copper sulphide system located in biotite/muscovite-biotite schists within gneiss. The deposit features stacked, flat-lying to shallow east-dipping lenses at or very near the surface, drilled to depths exceeding 200 meters. Over 12 kilometers of strike have been defined within a approximately 20 km copper-in-soil anomaly, with 372 holes totaling more than 87,000 meters drilled in Phase One. The company has no mineral resource estimate for Dumbwa but has analogued the system to Barrick’s Lumwana.

The Kazhiba Main property, also 100% owned, hosts near-surface oxide copper mineralization dominated by malachite at depths of 0–30 meters, located 6.8 km from First Quantum’s Kansanshi infrastructure. On 9 March 2026, the company filed a technical report for a maiden NI 43-101 Indicated resource of 2.33 million tonnes at 1.41% Cu, based on a 0.10% Cu cutoff effective 20 January 2026. This equates to 72.3 million pounds of contained copper. The resource estimate assumes 95% mining and processing recovery, with heap-leach recovery rates between 75–95%, despite no completed testwork. The company positions the asset for monetization as non-dilutive funding.

On 21 September 2026, Midnight Sun announced an earn-in agreement for the Mulundu project, a 62 km² licence within the Solwezi project. The terms require an initial payment of US$25,000, with an option to earn 51% by spending US$750,000 in exploration within 24 months of environmental clearance. An optional further 29% can be earned by spending US$3,000,000 within 36 months. Dilution below 10% converts to a 2% NSR, which is buyable for US$1 million.

Financial data from the Q2-2026 filings shows Midnight Sun held C$18.21 million in cash with zero debt and total equity of C$29.69 million, resulting in a book value of C$0.14 per share. For the first half of 2026, the company reported a net loss of C$19.54 million (EPS −C$0.09) and an operating cash outflow of C$13.96 million. With 217,574,599 shares outstanding, the company reported no revenue and no going-concern flag. Its last financing was a C$30.48 million raise at C$1.35 per unit in October 2025, which included 11.3 million half-warrants at C$2.00 expiring in October 2027. Approximately 43.6 million warrants and 15.9 million options remain outstanding, including 31.0 million warrants at C$0.33 expiring in May 2027.

Management includes CEO Al Fabbro, COO Dr. Kevin Bonel (ex-Barrick Lumwana), EVP Matt Mackenzie, and CFO Alistair Brownlow. The board comprises Brett Richards, Rick Mazur, Wayne Moorhouse, and Robert Sibthorpe.