Dakota Gold Corp. (NYSE: DC) is pleased to announce initial results from its 2025 drill campaign at the Richmond Hill Oxide Heap Leach Gold Project. The initial assay results from 19 drill holes received to date are consistent with previous drilling and are in line with our expectations including drill hole RH25C-164 intersecting 1.94 grams per tonne gold (g/t Au) over 60.0 meters, of which 51.9 meters is potentially heap leachable material. Dakota Gold currently has two drills operating at Richmond Hill and the Company expects to drill 24,384 meters (~80,000 feet) for the campaign using a combination of Reverse Circulation and Core drilling. The Core drilling is to collect metallurgical samples for column testing for the Feasibility Study on Richmond Hill, and to conduct infill, and resource expansion drilling in the northern portion of the Project area. The Reverse Circulation drilling is to install monitor wells in support of environmental baseline data collection for permitting.

Richmond Hill Drill Campaign Highlights:

• Drilling commenced April 1, 2025 and 56 holes representing 30% of the drill campaign have since been completed. The 19 drill hole assay results that have been returned were completed for metallurgical testing.

• Highlighted intersections include:

• RH25C-162 intersected 1.85 g/t Au over 43.4 meters (80 gram meters)
• RH25C-164 intersected 1.94 g/t Au over 60.0 meters (116 gram meters)
• RH25C-166 intersected 2.25 g/t Au over 44.3 meters (100 gram meters)
• RH25C-167 intersected 2.10 g/t Au over 34.3 meters (72 gram meters)
• RH25C-169 intersected 2.78 g/t Au over 39.3 meters (109 gram meters)

• The drill campaign began in the northern part of the Project area and will continue to progress northeast over the coming months and conclude in the fall. The northeast corner of the Project area, expected to be mined at the beginning of the mine plan, has mineralization at or near surface. This area remains open for expansion and has potential for significant oxide material based upon previous drilling results. Drilling is expected to commence in the northeast area in July.

• The Company will continue to report drill results through the fall as they are received and the results from the drill campaign will inform the Feasibility Study, which is expected in early 2027.

James Berry, VP Exploration for Dakota Gold, said, “I am very happy with how the drill campaign is progressing, and I am pleased to report Dakota Gold’s team and contractors have maintained our excellent safety record with zero LTI or environmental incidents. The assay results received continue to confirm significant mineralization that has potential to be heap leachable based on anticipated metallurgical performance that was used for the most recent S-K 1300 resource announced in February of this year. The grade and widths of the gold intercepts reported today continue to validate results from previous drill programs.”

Dakota Gold is focused on the heap leachable resource at Richmond Hill. While we currently have modelled oxide and sulfide boundaries, we are drilling these holes to better define these boundaries and the impact related to classification is something that will be updated through a geo-metallurgical model for the Feasibility. These holes were defined and drilled to acquire enough samples for metallurgical tests by grade, rock type and oxidation state so that composites can be made for heap leach column tests.

Initial Assessment with Cash Flow and Feasibility Planning:

Dakota Gold has engaged its current consulting groups based on their capabilities to deliver an IACF based on a 30,000 ton per day crushing circuit by mid-2025. With Feasibility planning, M3 is the overall Study Manager as well as the lead for processing, while RESPEC will manage the mining and environmental aspects. IMC will provide an update to the resource with the new drilling results. Woods Processing and Welsh and Associates are the expected Qualified Persons for metallurgy and design and operation of the heap leach. The Feasibility Study is expected to be completed in early 2027.

Richmond Hill is one of the largest undeveloped oxide gold resources in the United States being advanced by a junior mining company. With the recent financing announced March 20, 2025, the Company currently has a cash balance of $47 million as noted in the filed 10Q as at March 31, 2025, and is fully financed through the IACF and the subsequent completion of its Feasibility Study on the Project.

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

The table may contain rounding errors.

1. Abbreviations in the table include ounces per ton; grams per tonne; feet; and meter.
2. True thickness unknown.
3. Intervals calculated based on 0.5 g/t Au cut-off and maximum dilution of 3.05 meters.

Figure 1. Plan Map of Dakota Gold Corp. Richmond Hill 2025 Drill Campaign Drill Hole Traces

 Figure 2. Cross Section of Dakota Gold Corp. Richmond Hill 2025 Drill Campaign Highlighted Drill Holes

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, and outlining a high-grade underground gold resource at the Maitland Gold Project, both located on private land in South Dakota.

Qualified Person and S-K 1300 Disclosure

James M. Berry, a Registered Member of SME and Vice President of Exploration of Dakota Gold Corp., is the Company’s designated qualified person (as defined in Subpart 1300 of Regulation S-K) for this news release and has reviewed and approved its scientific and technical content.

Quality Assurance/Quality Control consists of regular insertion of certified reference materials, duplicate samples, and blanks into the sample stream. Samples are submitted to the ALS Geochemistry sample preparation facility in Winnipeg, Manitoba. Gold and multi-element analyses are performed at the ALS Geochemistry laboratory in Vancouver, British Columbia. ALS Minerals is an ISO/IEC 17025:2017 accredited lab. Check samples are submitted to Bureau Veritas, Vancouver B.C. as an umpire laboratory. Assay results are reviewed, and discrepancies are investigated prior to incorporation into the Company database.