Dakota Gold Corp. (NYSE American: DC) is pleased to report additional assay results from its 2026 Drill Campaign at the Richmond Hill Oxide Heap Leach Gold Project. The 2026 Drill Campaign is now complete, and totalled 17,273 meters of infill, expansion, and geotechnical drilling across 112 holes. Results from the 2025 and 2026 drill campaigns at Richmond Hill are being incorporated into a Pre-Feasibility Study in the fourth quarter of 2026. This data will support an updated mineral resource estimate, refine the geo-metallurgical model, and deliver a single optimized mine plan with sequencing.

Highlights from this update include:

• Expansion drill hole RH26C-432 intersected 11.36 grams per tonne gold and 14.92 g/t silver over 26.3 meters (298 gram-meters Au), including 77.19 g/t Au and 63.12 g/t Ag over 3.2 meters (247 gram-meters Au) and RH26C-437 intersected 2.89 g/t Au and 8.18 g/t Ag over 38.0 meters (110 gram-meters Au) including 14.20 g/t Au and 12.90 g/t Ag over 1.5 meters (21 gram-meters Au). These results are another example of higher grades within the Deadwood Formation in the Northern Expansion area of Richmond Hill, where these trends have continued north from Chism Gulch, with highest grades continuous along structures.
• Expansion drilling in the northeast Project area remains open in all directions and continues to return grades exceeding the 0.566 g/t Au average grade in the July 2025 Initial Assessment with Cash Flow measured and indicated mine plan. High-grade gold intercepts in RH26C-432 and RH26C-437 are located approximately 365 meters (1,170 feet) and 361 meters (1,185 feet), respectively, north of the current measured and indicated resource boundary and represent meaningful step-outs. The 2025-2026 northeast expansion drill programs covered an area of 580 meters (1,903 feet) north – south and 730 meters (2,395 feet) east – west beyond the current M&I boundary.
• The Company has advanced the Richmond Hill PFS sufficiently to identify critical long lead time items. The longest lead time item is an electrical substation, which the Company has successfully obtained a build slot through Black Hills Energy (NYSE: BKH), a South Dakota based company that provides electrical and natural gas power to customers across north central United States. The Company expects to secure further long lead time items ordered in 2027 and 2028 as the Company leverages the over $100 million dollars in treasury to maintain its construction schedule and reduce production startup risks.

Jack Henris, President and COO of Dakota Gold, said, “We are encouraged by the results of the northeast expansion drilling, which continues to identify higher-grade zones that complement the large heap-leachable resource at Richmond Hill outlined in the IACF. With the 2026 Drill Campaign complete, our focus is on integrating these new results into the resource model and advancing comprehensive metallurgical work and trade-off studies in support of our Pre-Feasibility Study. We commend our team and contractors for safely delivering the drill campaign on time and on budget. Supported by our $107 million cash position as of March 31, 2026, we are also pleased to announce we have secured the electrical substation build slot and are advancing engineering, site layout, and operational readiness along the project’s critical path. This reflects the depth of our team’s experience and reinforces our commitment to advancing Richmond Hill as the next gold mine in the Homestake District.”

Figure 1. Plan Map showing location of Dakota Gold Corp. Richmond Hill drill results reported today in Table 1.

Figure 2. Plan Map showing northeast location of Dakota Gold Corp. Richmond Hill drill results beyond the current measured and indicated resource boundary.

Figure 3. 1,050-East-West field of view section map of Richmond Hill looking East.

Table 1. Richmond Hill drill results (Metric / Imperial)^1,2,3,4

About Dakota Gold Corp.

Dakota Gold is expanding the legacy of the 145-year-old Homestake Gold Mining District by advancing the Richmond Hill Oxide Heap Leach Gold Project to commercial production as soon as 2029, and outlining a Tertiary maiden resource as well as a high-grade underground gold resource at the Maitland Gold Project, both located on private land in South Dakota.