Dakota Gold Corp. (NYSE American: DC) is pleased to report additional drill hole assay results from the Richmond Hill Oxide Heap Leach Gold Project. Drilling continues to confirm widespread gold mineralization and resource growth potential. The company is operating two drills and plans to complete approximately 27,500 meters (~90,000 feet) of drilling during its 2025 drilling campaign.

Highlights from this update include:

• Metallurgical drill hole RH25C-236 intersected 8.17 grams per tonne gold (g/t Au) over 11.3 meters (93 gram meters) at surface in the central Project area. The results exceed the current block model gold mineralization grades in the area.

• Expansion drill hole RH25C-296 intersected 1.45 g/t Au over 18.3 meters (27 gram meters) in a step-out 150 meters (500 ft) north of the current Measured and Indicated resource boundary. The mineralization in the northeast is only limited by drilling and remains open. The Company is drill-testing the area up to 450 meters (1,500 ft) north and 1,520 meters (5,000 ft) wide.

“These latest drill results at Richmond Hill continue to confirm the significant potential of this Project,” said Jack Henris, President and COO of Dakota Gold. “The combination of high-grade intercepts, mineralization, and state and county focused permitting, positions Richmond Hill as a compelling development opportunity. We remain focused on advancing drilling, feasibility work, and permitting to unlock long-term value for our shareholders and stakeholders.”

Dakota Gold has successfully completed drilling and pump installation at all 28 water wells required for permitting in consultation with the South Dakota Department of Agriculture and Natural Resources. Sampling began in November, with 12 months of monitoring planned to support both the Feasibility Study and permit application, targeted for early 2027. The Project footprint is on private land, requiring state and county permits. While drilled for water sampling, the holes have been assayed for gold as reported here.

The Company’s core drilling remains active in the northeast Project area where we will have additional assay results through the fourth quarter of 2025 and into 2026. The core drilling on the Project 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 refine the modelled boundaries and improve the precision of the geo-metallurgical domains, as well as inform both the oxide and sulfide resource updates for the Feasibility Study.

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

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Table 1. Richmond Hill Drill Results (Metric / Imperial)^1,2,3,4,5,6

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.
5. The following condemnation holes drilled at the location of the planned heap leach pad 1 have confirmed no significant gold mineralization: RH25C-249; RH25C-255; RH25C-260; RH25C-262; RH25C-267; RH25C-271
6. The following monitoring water well holes drilled outside of the resource area for permitting have confirmed no significant gold mineralization: BG-GW-01/02; CC-GW-05

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.

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