Dakota Gold Corp. (NYSE American: DC) is pleased to report assay results from 26 drill holes completed as part of its ongoing 2025 drilling campaign at the Richmond Hill Oxide Heap Leach Gold Project. These results include the first assays from expansion drilling in the northeast corner of the Project.

Drilling continues to confirm high-grade gold mineralization in the northern portion of Richmond Hill, supporting the Company’s plan to prioritize initial mining in this area. Dakota Gold currently has two drills operating on site and expects to complete approximately 27,500 meters (~90,000 feet) of drilling during the 2025 campaign.

Highlights from this update include:

• Expansion and infill drill holes in the northeastern corner of the Project area are intersecting significantly higher-grade gold than the average resource grade including RH25C-278 intersecting 1.75 grams per tonne gold over 19.9 meters (35 gram meters) and RH25C-295 intersecting 2.15 g/t Au over 30.0 meters (65 gram meters). The 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.

• 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-270 intersecting 2.26 g/t Au over 29.2 meters (66 gram meters) and RH25C-288 intersecting 4.15 g/t Au over 14.5 meters (60 gram meters). The metallurgical drilling results demonstrate the low-risk nature of the deposit with widespread mineralization.

“The drill results announced today continue to validate the scale and quality of Richmond Hill, which hosts one of the largest undeveloped heap leach gold resources in the United States” said Jack Henris, President and COO of Dakota Gold. “The continuity and pervasive nature of the near surface deposit support a project that is low-cost, long-life, and delivers high-margins, as highlighted in our Initial Assessment with Cash Flow earlier this year. With metallurgical drilling for the 2025 campaign now complete, we are advancing heap leach column testing and look forward to sharing those results as they are completed.”

The Company’s core drilling remains active in the northeast Project area where we will have additional assay results from expansion and infill of the unconstrained mineralization 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 inform both the oxide and sulfide resource updates for the Feasibility Study.

The group of assay results reported today in Figure 1 include assay results 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

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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.

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