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Dakota Gold Continues to Advance Richmond Hill with 2025 Drill Campaign and Metallurgical Test Program

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Dakota Gold (NYSE American: DC) has provided an update on its 2025 Richmond Hill Oxide Heap Leach Gold Project drill campaign. The company is operating three drills and plans to complete 27,500 meters of drilling in 2025.

Key highlights include metallurgical drill hole RH25C-171 intercepting 1.50 g/t Au over 62.1 meters, significantly higher than the average resource grade of 0.463 g/t Au. The company has appointed Mike Eiselein as VP Project Development to oversee metallurgical testing, with results expected before year-end.

The Feasibility Study is expected to be completed in early 2027, with ongoing metallurgical testwork and drilling focused on resource expansion in the northeast Project area, where previous drilling intercepted 2.22 g/t Au over 50.0 meters.

Dakota Gold (NYSE American: DC) ha aggiornato la campagna di perforazione 2025 per il progetto aurifero Richmond Hill Oxide Heap Leach. La società sta operando tre trivelle e prevede di completare 27.500 metri di perforazione nel 2025.

Tra i punti salienti c’è il foro metallurgico RH25C-171 che ha intercettato 1,50 g/t Au su 62,1 metri, valore nettamente superiore al grado medio del giacimento pari a 0,463 g/t Au. La società ha nominato Mike Eiselein vicepresidente Project Development per supervisionare i test metallurgici, i cui risultati sono attesi entro fine anno.

Lo studio di fattibilità è previsto per i primi mesi del 2027, mentre i test metallurgici e le perforazioni continueranno con l’obiettivo di espandere le risorse nell’area nord‑est del progetto, dove precedenti fori avevano intercettato 2,22 g/t Au su 50,0 metri.

Dakota Gold (NYSE American: DC) ha compartido una actualización sobre la campaña de perforación 2025 del proyecto de lixiviación en pilas de óxidos Richmond Hill. La compañía opera tres equipos de perforación y planea completar 27.500 metros de perforación en 2025.

Entre los puntos destacados, el ensayo metalúrgico RH25C-171 interceptó 1,50 g/t Au sobre 62,1 metros, muy por encima del grado medio del recurso de 0,463 g/t Au. La empresa designó a Mike Eiselein como vicepresidente de Desarrollo de Proyectos para supervisar las pruebas metalúrgicas; se esperan resultados antes de fin de año.

El estudio de factibilidad se prevé para principios de 2027, mientras que los ensayos metalúrgicos y la perforación continuarán enfocados en la expansión de recursos en el sector noreste del proyecto, donde perforaciones previas interceptaron 2,22 g/t Au sobre 50,0 metros.

Dakota Gold (NYSE American: DC)가 2025년 리치먼드 힐 산화물 힙리치 금 프로젝트 시추 캠페인에 대한 업데이트를 제공했습니다. 회사는 3대의 시추기를 가동 중이며 2025년에 27,500미터의 시추를 완료할 계획입니다.

주요 사항으로는 금속학적 시추공 RH25C-171에서 62.1미터 구간에 평균 1.50 g/t Au가 확인되어 평균 자원 등급인 0.463 g/t Au보다 훨씬 높다는 점이 있습니다. 회사는 금속학적 시험을 총괄할 프로젝트 개발 부사장(Mike Eiselein)을 임명했으며, 시험 결과는 연말 전에 발표될 예정입니다.

타당성 조사 완료는 2027년 초로 예정되어 있으며, 금속학적 시험과 시추는 북동쪽 프로젝트 구역의 자원 확장에 중점을 두고 계속 진행됩니다. 해당 구역의 이전 시추에서는 50.0미터 구간에 2.22 g/t Au가 확인된 바 있습니다.

Dakota Gold (NYSE American: DC) a communiqué une mise à jour sur la campagne de forage 2025 du projet aurifère Richmond Hill Oxide Heap Leach. La société exploite trois foreuses et prévoit de réaliser 27 500 mètres de forage en 2025.

Parmi les faits marquants, le trou métallurgique RH25C-171 a intercepté 1,50 g/t Au sur 62,1 mètres, bien supérieur au grade moyen des ressources de 0,463 g/t Au. La société a nommé Mike Eiselein vice‑président Project Development pour superviser les essais métallurgiques, dont les résultats sont attendus avant la fin de l’année.

L’étude de faisabilité est prévue pour début 2027. Les essais métallurgiques et les forages se poursuivront en visant l’expansion des ressources dans la zone nord‑est du projet, où des forages antérieurs avaient intercepté 2,22 g/t Au sur 50,0 mètres.

Dakota Gold (NYSE American: DC) hat ein Update zur Bohrkampagne 2025 des Richmond Hill Oxide Heap Leach Gold Projects veröffentlicht. Das Unternehmen betreibt drei Bohrgeräte und plant, im Jahr 2025 27.500 Meter an Bohrungen abzuschließen.

Zu den Highlights gehört das metallurgische Bohrloch RH25C-171, das 1,50 g/t Au über 62,1 Meter durchschnittlich durchteufte – deutlich über dem durchschnittlichen Lagerstättengehalt von 0,463 g/t Au. Das Unternehmen hat Mike Eiselein als VP Project Development benannt, der die metallurgischen Tests leiten wird; Ergebnisse werden noch vor Jahresende erwartet.

Die Machbarkeitsstudie wird für Anfang 2027 erwartet. Die metallurgischen Prüfungen und Bohrungen konzentrieren sich weiterhin auf die Ressourcenerweiterung im nordöstlichen Bereich des Projekts, wo frühere Bohrungen 2,22 g/t Au über 50,0 Meter durchteufte.

Positive
  • High-grade intercepts significantly above average resource grade (1.50 g/t Au over 62.1m)
  • Potential resource expansion identified in northeast Project area
  • Strengthened technical team with appointment of experienced VP Project Development
  • Systematic advancement toward Feasibility Study with defined metallurgical testing timeline
  • Additional mineralization discovered in condemnation drilling, potentially expanding pit resources
Negative
  • Feasibility Study completion not expected until early 2027
  • Project timeline indicates extended period before potential production
  • Metallurgical test results still pending, creating uncertainty around processing parameters

Insights

Dakota Gold reports promising drill results above resource grade at Richmond Hill, advancing toward feasibility study with expanded metallurgical testing.

Dakota Gold's Richmond Hill drilling campaign is showing significantly higher gold grades than the average resource grade of 0.463 g/t Au. The highlight intercept of 1.50 g/t Au over 62.1 meters (93 gram meters) in hole RH25C-171 represents more than triple the average measured and indicated resource grade, which is particularly encouraging for project economics.

The company's strategic focus on the northeastern project area is technically sound. They're targeting zones like the one where previous drilling intercepted 2.22 g/t Au over 50 meters, which represents nearly 5x the average resource grade. This area is geologically favorable for early mining, potentially improving initial cash flows when production begins.

Metallurgical work is progressing systematically with column testing of oxide material. The program design follows industry best practices by testing various rock types and oxidation states to build a comprehensive geo-metallurgical model. The appointment of Mike Eiselein brings valuable operational expertise in heap leach processing, which will be critical for optimizing recovery rates.

The drilling results from condemnation holes under historical leach pads (like RH25C-183 with 1.82 g/t Au over 10.8 meters) could meaningfully expand the resource envelope and potentially improve the mine plan by converting waste to ore. The multi-pronged approach of simultaneously conducting metallurgical, infill, and expansion drilling is an efficient use of resources that should accelerate the path to feasibility.

This drill campaign represents an important de-risking phase for Dakota Gold's flagship project. The higher-than-average grades encountered in multiple drill holes should positively impact project economics when incorporated into an updated resource model. Particularly significant is the concentration of these higher-grade zones in areas planned for early mining, which could enhance initial production rates and accelerate investment recovery.

The metallurgical program advancement shows disciplined capital deployment focused on technical fundamentals. Dakota Gold is making measured progress toward their early 2027 feasibility timeline with a methodical approach to resource definition, metallurgy, and engineering. The systematic testing schedule announced (Q3 2025-Q2 2026) provides investors with clear development milestones to track project progress.

The hiring of Mike Eiselein as VP Project Development adds valuable operational expertise in heap leach processing - crucial for this project type. His experience with major producers like Barrick and Newmont suggests Dakota Gold is building the technical team needed to advance from exploration to development. The company's three-drill program represents a significant but measured exploration investment, balancing resource growth with capital efficiency.

Particularly encouraging is the potential for resource expansion from condemnation drilling under historical leach pads, which could improve the economics by increasing ore tons while utilizing already disturbed ground. The 227% higher grade in hole RH25C-171 versus average resource grade suggests potential for grade improvement in future resource updates.

Lead, South Dakota--(Newsfile Corp. - September 9, 2025) - Dakota Gold Corp. (NYSE American: DC) ("Dakota Gold" or the "Company") is pleased to provide an update on its 2025 drill campaign including progress on metallurgical testwork for the Richmond Hill Oxide Heap Leach Gold Project ("Richmond Hill" or the "Project"). Dakota Gold currently has three drills operating at Richmond Hill and the Company expects to drill 27,500 meters (~90,000 feet) for the 2025 campaign using a combination of Reverse Circulation and Core drilling.

Highlights from this update include:

  • Metallurgical drill holes intercept higher gold grade than the average resource grade including drill hole RH25C-171 with 1.50 grams per tonne gold (g/t Au) over 62.1 meters (93 gram meters). RH25C-171 is one of many metallurgical drill holes reported from the north central Project area (Figure 1) that intercepted significantly higher-grade than the average measured and indicated resource grade of 0.463 g/t Au (0.0135 ounces per ton Au).
  • The Company is now active with two Core drills in the northeast Project area where we expect assay results from expansion and infill of higher-grade zones before the end of the year. Figure 2 and 3 illustrate the target area where previously reported drill hole RH24C-142 intercepted 2.22 g/t Au over 50.0 meters. The proposed infill and expansion drilling surrounding the intercept has the potential to add to the Measured, Indicated and Inferred resources based on prior drilling and current resources in the area. The mineralization in the northeast, including the Chism Gulch area is only limited by drilling and remains open. The area is expected to be mined at the beginning of the mine plan as outlined in the July 7, 2025 Initial Assessment with Cash Flow.
  • Acceleration of metallurgical testwork to refine phase two metallurgical program and strengthening of in-house capabilities. An initial two composite samples totaling 1,500 pounds for the purpose of conducting column testing of material from the initial phases of mining at the north end of the Project area have been sent to Forte Dynamics. The test results are expected before year-end and will inform the follow-up metallurgical drilling and testwork for 2026, that will then inform our Feasibility Study in progress. The Company also welcomes Mike Eiselein as Vice President Project Development to the Dakota Gold team to oversee the metallurgical program. Mr. Eiselein has extensive operational experience applicable to our Richmond Hill Gold Project.

"We are pleased with the progress of the 2025 drill campaign and look forward to releasing additional results from the drilling in the northeast Project area as they are received," said Jack Henris, President and COO of Dakota Gold. "Dakota Gold remains focused on advancing the Project through disciplined exploration and technical rigor with the results from the current drill campaign contributing to the Feasibility Study, which is expected to be completed in early 2027."

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 core from all holes is systematically assayed for gold due to the significant halo of low-grade gold mineralization underlying much of the Project area. In addition, the Company is also active with a Reverse Circulation drill to install monitor wells in support of environmental baseline data collection for permitting.

The group of assay results reported today in Figure 1 are primarily from metallurgical and condemnation drilling in the north central Project area. The drill results will refine the modelled oxide and sulfide boundaries and improve the precision of the geo-metallurgical model 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 and oxidation states so that composites can be made for heap leach column tests.

The condemnation drill holes under historical leach pads show potential for pit expansion and conversion of waste to mineralized material. Drill hole RH25C-183 intersected 1.82 g/t Au over 10.8 meters outside of the Measured and Indicated Initial Assessment with Cash Flow mine plan announced on July 7, 2025. Follow-up drilling in 2026 is planned and has the potential to add material to the mine plan.

Metallurgical testwork update:

Metallurgical drilling at the Project for 2025 is near completion, and the Company is preparing for the next phase of studies. To support this effort, the Company has appointed Mike Eiselein as Vice President Project Development to oversee the metallurgical program.

Mike Eiselein joined the Company on August 18, 2025 and brings over 34 years' experience in process operations, engineering, design, and maintenance across a broad-spectrum of operations ranging from refractory and double refractory gold processing, oxide heap leach, base metals flotation, and industrial minerals. Prior to joining the Company, Mr. Eiselein held senior operations positions with many established mining companies such as Barrick Gold Corporation, Newmont Mining Corporation, McEwen Mining Inc., Teck Cominco, and Bunker Hill Mining. Mr. Eiselein holds a BSc in Metallurgical Engineering/Mineral Processing from Montana College of Mineral Science and Technology.

The metallurgical testwork cadence will focus on finalizing geo-metallurgical domains and performing trade-off studies to establish processing optimization to minimize capital and operating expenditures, while maximizing recoveries and cash flow in the Feasibility Study.

  • Finalize geo-metallurgical domains (Q3 2025)

  • Sample preparation and shipment (Q3 / Q4 2025)

  • Metallurgical sample preparation for testing (Q4 2025)

  • Material testing and column tests (Q4 2025 / Q2 2026)

  • Final test report (Q2 2026)

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

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Figure 2. Plan Map of Dakota Gold Corp. Richmond Hill 2025 Drill Campaign in Northeast Expansion and Infill Project Area

Plan map showing the S-K 1300 Initial Assessment resource block model of the 5,600, 5,500, 5,400 and 5,300 bench levels in the northeast Project area including the Chism Gulch area projected to the surface with select historical drill hole information that informed the block model, and the location of current and future drill holes designed for the metallurgical, infill and step-out drilling to define and expand a future resource estimation.

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Figure 3. Cross Section of Dakota Gold Corp. Richmond Hill 2025 Drill Campaign in Northeast Expansion and Infill Project Area

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

Hole #From
(m)
To
(m)
Interval (m)Grade
(g/t)
g x mFrom
(ft)
To
(ft)
Interval
(ft)
Grade
(oz/ton)
Program
RH25C-17116.578.662.11.509354.2258.0203.80.044Metallurgical
RH25C-17290.292.92.72.517296.0304.98.90.073Metallurgical

97.7100.42.70.582320.6329.48.80.017

157.0160.33.31.013515.2526.010.80.029
RH25C-17338.353.515.10.8313125.7175.449.70.024Metallurgical

57.860.32.51.093189.7197.98.20.032
RH25C-174163.4171.07.61.249536.0561.025.00.036Metallurgical
RH25C-17528.364.736.30.833093.0212.2119.20.024Metallurgical
RH25C-1769.414.55.00.67331.047.516.50.020Condemnation
RH25C-1770.06.56.51.0270.021.221.20.030Condemnation

192.7213.420.70.6814632.3700.267.90.020
RH25C-17869.574.14.60.542228.1243.215.10.016Condemnation

170.5180.09.50.586559.5590.731.20.017
RH25C-1790.06.36.30.5530.020.820.80.016Condemnation

28.632.54.01.32593.7106.713.000.038

85.087.92.80.812279.0288.39.30.024

144.6151.16.50.725474.4495.621.20.021

154.8158.63.80.974507.9520.312.40.028

178.9182.94.10.853586.8600.113.30.025
RH25C-18022.335.112.71.171573.3115.041.70.034Condemnation
RH25C-18160.073.013.01.0714196.8239.442.60.031Metallurgical

76.487.310.91.5617250.7286.435.70.045

108.4136.428.01.3237355.8447.591.70.038

142.6145.83.21.013467.9478.410.50.029
RH25C-182101.3112.110.80.667332.5367.835.30.019Metallurgical

121.1129.18.10.635397.2423.726.50.018

147.5152.95.41.227483.9501.517.60.036
RH25C-1833.511.17.70.58411.436.525.10.017Condemnation

140.3146.36.00.533460.2479.919.70.015

155.6166.410.81.8220510.5546.035.50.053

217.2221.24.00.643712.6725.713.10.019
RH25C-184No Significant ValuesMetallurgical
RH25C-185213.1221.78.60.585699.2727.328.10.017Condemnation
RH25C-18617.540.022.50.671557.3131.173.80.020Metallurgical

66.071.25.20.935216.6233.717.10.027

79.9100.020.10.8417262.0328.066.00.025
RH25C-18735.965.029.10.7422117.7213.295.50.022Metallurgical
RH25C-18822.626.13.50.55274.385.711.40.016Metallurgical

29.335.96.60.62496.0117.721.70.018

58.166.78.61.069190.5218.728.20.031

122.5125.63.00.582402.0412.010.00.017

129.7139.810.10.828425.6458.733.10.024
RH25C-18952.059.37.30.685170.5194.423.90.020Metallurgical

67.290.122.91.0223220.5295.775.20.030

94.096.32.37.9018308.5316.07.50.230
RH25C-1900.04.44.40.6830.014.514.50.020Metallurgical

8.826.717.91.512728.987.558.60.044

29.959.729.80.852598.0195.997.90.025

65.868.93.00.812215.9225.910.00.024

140.7155.214.52.9643461.5509.147.60.086

186.4199.012.71.1214611.4653.041.60.033
RH25C-1920.04.94.90.5530.016.016.00.016Metallurgical

11.225.414.20.891336.683.346.70.026
RH25C-1934.420.616.21.031714.567.653.10.030Metallurgical
RH25C-19460.163.43.31.465197.2207.910.70.042Infill

84.689.24.60.583277.5292.515.00.017

129.0134.15.20.714423.1440.016.90.021

159.8165.45.60.644524.2542.618.40.019

182.4186.54.10.592598.4611.813.40.017

 

The table may contain rounding errors.

  1. Abbreviations in the table include ounces per ton ("oz/ton"); grams per tonne ("g/t"); feet ("ft"); meter ("m"); and gram meters ("g x m").
  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 the 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.

Subscribe to Dakota Gold's e-mail list at www.dakotagoldcorp.com to receive the latest news and other Company updates.

Shareholder and Investor Inquiries

For more information, please contact:

Jack Henris
President and COO
Tel: +1 605-717-2540

Shawn Campbell
Chief Financial Officer
Tel: +1 778-655-9638

Carling Gaze
VP of Investor Relations and Corporate Communications
Tel: +1 605-679-7429
Email: info@dakotagoldcorp.com

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.

Forward-Looking Statements

This communication contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. When used in this communication, the words "plan," "target," "anticipate," "believe," "estimate," "intend," "potential," "will" and "expect" and similar expressions are intended to identify such forward-looking statements. Any express or implied statements contained in this communication that are not statements of historical fact may be deemed to be forward-looking statements, including, without limitation: our expectations regarding additional drilling, metallurgy and modeling; our expectations for the improvement and growth of the mineral resources and potential for conversion of mineral resources into reserves; completion of a feasibility study, and/or permitting; our expectations regarding free cash flow and future financing, and our overall expectation for the possibility of near-term production at the Richmond Hill project. These forward-looking statements are based on assumptions and expectations that may not be realized and are inherently subject to numerous risks and uncertainties, which could cause actual results to differ materially from these statements. These risks and uncertainties include, among others: the execution and timing of our planned exploration activities; our use and evaluation of historic data; our ability to achieve our strategic goals; the state of the economy and financial markets generally and the effect on our industry; and the market for our common stock. The foregoing list is not exhaustive. For additional information regarding factors that may cause actual results to differ materially from those indicated in our forward-looking statements, we refer you to the risk factors included in Item 1A of the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2024, as updated by annual, quarterly and current reports that we file with the SEC, which are available at www.sec.gov. We caution investors not to place undue reliance on the forward-looking statements contained in this communication. These statements speak only as of the date of this communication, and we undertake no obligation to update or revise these statements, whether as a result of new information, future events or otherwise, except as may be required by law. We do not give any assurance that we will achieve our expectations.

All references to "$" in this communication are to U.S. dollars unless otherwise stated.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/265613

FAQ

What were the key drilling results from Dakota Gold's Richmond Hill Project in 2025?

The key result was drill hole RH25C-171 which intercepted 1.50 g/t Au over 62.1 meters, significantly higher than the average resource grade of 0.463 g/t Au.

When will Dakota Gold (DC) complete its Feasibility Study for Richmond Hill?

The Feasibility Study is expected to be completed in early 2027.

How many meters does Dakota Gold plan to drill at Richmond Hill in 2025?

Dakota Gold plans to drill 27,500 meters (approximately 90,000 feet) using a combination of Reverse Circulation and Core drilling.

Who is Dakota Gold's new Vice President of Project Development?

Mike Eiselein joined as VP Project Development in August 2025, bringing over 34 years of experience in process operations and engineering.

What is the timeline for Dakota Gold's metallurgical testing program?

Initial test results are expected before year-end 2025, with final test reports scheduled for Q2 2026.
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