Dakota Gold Corp. (NYSE American: DC) is pleased to report the additional assay results received from its 2026 Drill Campaign at the Richmond Hill Oxide Heap Leach Gold Project. The 2026 Campaign includes 17,273 meters of drilling in 112 holes and consists of a combination of infill, expansion and geotechnical drilling. Gold and silver assay data from more than 350 drill holes completed as part of the 2025 and ongoing 2026 drill campaigns at Richmond Hill will be incorporated into a Pre-Feasibility Study in the second half of 2026. This expanded dataset represents an approximately 30% increase in drill holes relative to the drill holes that informed the mineral resource estimate outlined in the July 2025 Initial Assessment with Cash Flow and will support a comprehensive update to the mineral resource estimate, as well as further refine the geo-metallurgical model, mine plan, and sequencing. Together, these advancements are designed to enhance project definition and underpin the continued advancement of Richmond Hill toward development.

Highlights from this update include:

• Expansion drill hole RH26C-417 intersected 5.24 grams per tonne gold (g/t Au) and 4.43 g/t silver (g/t Ag) over 13.5 meters (71 gram-meters Au), including 12.15 g/t Au and 3.08 g/t Ag over 1.8 meters (22 gram-meters Au) and RH26C-418 intersected 3.33 g/t Au and 5.81 g/t Ag over 20.9 meters (70 gram-meters Au). RH26C-417 and RH26C-418 are located approximately 440 meters (1,444 feet) and 230 meters (755 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 past the current M&I boundary. The mineralization in the northeast is only limited by drilling and remains open in all directions.
• The 2026 drill campaign continues to deliver multiple higher-grade gold intercepts, with expansion holes RH26C-417 and RH26C-418 both exceeding the average grade of 0.566 g/t Au outlined in the IACF measured and indicated mine plan. These results build on the success of prior drilling, further highlighting the northeast area of the Project as a key zone of higher-grade gold mineralization. Notably, the highest gram-meter gold intersection from the 2025 infill and expansion drill campaign was located in the northeast area – RH25C-310 intersected 5 g/t Au and 28.64 g/t Ag over 24.9 meters (124 gram-meters Au), including 60.82 g/t Au and 61.68 g/t Ag over 1.5 meters (89 gram-meters Au).
• Over 94% of the total planned drilling for this year’s Richmond Hill Campaign has been completed to date with 16,390 meters in 104 drill holes. Drilling productivity and assay turnaround times remain on track, and the Campaign is expected to be completed at the end of June 2026.

Jack Henris, President and COO of Dakota Gold, said, “We are encouraged by the expansion drill results from the northeast, which build on last year’s campaign and continue to demonstrate the scale and potential of the mineralized system at Richmond Hill. These results reinforce our strategy of expanding the known footprint through step-out drilling to grow the resource area and drive value, with multiple targets already delivering positive results and additional updates expected in the coming weeks. As we complete geotechnical drilling this month, our focus remains on advancing trade-off studies and delivering the Pre-Feasibility Study in the second half of this year.”

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 boundary.

Figure 3. 600-Meter-Wide Section Map of Richmond Hill Looking East.

Table 1. Richmond Hill Drill Results (Metric / Imperial)^1,2,3,4

The table may contain rounding errors.

1. Abbreviations in the table include ounces per ton (“oz/ton”); grams per tonne; feet; meter; gram meters.
2. True thickness unknown.
3. Intervals calculated based on 0.5 g/t Au cut-off and maximum dilution of 3.05 meters.
4. The July 7, 2025 Initial Assessment with Cash Flow has an open pit designed with 12.2m (40 ft) benches. The average grade for the Measured and Indicated mine plan is 0.566 g/t Au (0.017 oz/ton). A gram-meter of 7 and above has been highlighted in Table 1 based on the bench height and average grade.

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.