Dakota Gold Corp. (NYSE: DC) is pleased to announce assay results from a further 32 infill and metallurgical drill holes from its ongoing 2025 campaign for the Richmond Hill Oxide Heap Leach Gold Project. Drilling continues to intercept high-grade gold in the northern Project area supporting the Company’s plan to initiate the first years of mining in the north. Dakota Gold currently has two drills operating at Richmond Hill and the Company expects to drill 27,500 meters (~90,000 feet) for the 2025 campaign.

Highlights from this update include:

• Infill drill holes in the northwestern corner of the Project area demonstrate future step out drilling opportunities with drill hole RH25C-241 intersecting 3.72 grams per tonne gold (g/t Au) over 20.5 meters (76 gram meters), including 28.2 g/t Au over 1.5 meters (41 gram meters) at the edge of the Measured and Indicated resource cone boundary. Results highlight the potential for further resource expansion drilling in the area.

• Metallurgical drill holes across the northern Project area continue to intercept high-grade gold, de-risking the Project and providing greater confidence in the resource including RH25C-209 with 1.40 g/t Au over 73.5 meters (103 gram meters) and RH25C-211 with 1.55 g/t Au over 52.3 meters (81 gram meters). The metallurgical drilling results demonstrate the low-risk nature of the deposit with widespread mineralization.

• The Company’s core drilling is currently active in the northeast Project area where we expect assay results from expansion and infill of the unconstrained mineralization before the end of the year. The proposed expansion drilling surrounding the area has the potential to add to the resource based on prior drilling and current resources in the area. The mineralization in the northeast is only limited by drilling and remains open.

“We are encouraged to see assay results from metallurgical drilling that support the mine plan proposed in the July 7, 2025 Initial Assessment with Cash Flow” said James Berry, VP Exploration at Dakota Gold. “The 2025 core drilling campaign is providing critical data enhancing our geological resource understanding supporting our transition to Feasibility Study. The consistency of mineralization across the northern Project area is particularly promising as we target this area for the initial stages of mining.”

Dakota Gold is conducting core drilling at the northern portion of the Project area for the purposes of completing a Feasibility Study. The core drilling is designed to collect metallurgical samples for column testing, condemnation drilling beneath proposed site infrastructure for mine planning, infill drilling to upgrade the existing resource, and expansion drilling where the resource remains open. The drill results will inform both the oxide and sulfide resource updates for the Feasibility Study.

The group of assay results reported today in Figure 1 are primarily from metallurgical drilling in the northern Project area. The drill results will refine the modelled boundaries and improve the precision of the geo-metallurgical domains for the Feasibility and mine planning. In addition, the holes were designed to acquire samples for metallurgical tests ranging from low to high grade, various rock types, as well as oxide, transitional, and sulfide so that composites can be made for heap leach column tests.

Figure 1. Plan Map of Dakota Gold Corp. Richmond Hill 2025 Drill Campaign Highlighted Drill Results in Northern Project Area

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; grams per tonne; feet; meter; and 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 high-grade underground gold resource at the Maitland Gold Project, both located on private land in South Dakota.