Dakota Gold Continues to Intersect Significant Gold Mineralization in Ongoing 2025 Richmond Hill Drill Campaign

Rhea-AI Summary

Dakota Gold (NYSE American: DC) reported assay results from 32 infill and metallurgical drill holes in its 2025 Richmond Hill campaign dated October 16, 2025. The company is running two drills and plans ~27,500 m of drilling in 2025. Highlight intercepts include RH25C-241: 3.72 g/t Au over 20.5 m and metallurgical holes RH25C-209: 1.40 g/t Au over 73.5 m and RH25C-211: 1.55 g/t Au over 52.3 m. Results are concentrated in the northern Project area, support initial-year mine targeting, will supply metallurgical column-test samples, and are intended to inform the Feasibility Study and resource updates.

Positive

• Drill program size: 27,500 m planned for 2025
• High-grade intercept: 3.72 g/t Au over 20.5 m (RH25C-241)
• Long metallurgical intercept: 1.40 g/t Au over 73.5 m (RH25C-209)
• Results support north-first mine targeting and Feasibility Study sample collection

Negative

• Measured and Indicated mine plan average grade is 0.566 g/t Au
• Report notes true thickness unknown for reported intervals

Insights

Senior Mining Geologist

Dakota Gold reports widespread northern oxide mineralization and metallurgical samples that support the planned Feasibility Study and proposed mine plan.

Bold intersections such as 3.72 g/t Au over 20.5 m (including 28.2 g/t Au over 1.5 m) and long, consistent metallurgical intercepts like 1.40 g/t Au over 73.5 m and 1.55 g/t Au over 52.3 m provide direct, measurable inputs for resource modelling and heap‑leach column testing. The release states the 2025 core program will total ~27,500 meters and that these holes were collected to refine geo‑metallurgical domains, inform oxide and sulfide updates, and support the July 7, 2025 Initial Assessment with Cash Flow mine plan.

The business mechanism is straightforward: expanded and infill drilling plus metallurgical sampling reduce geologic and processing uncertainty and refine Feasibility Study inputs. Key dependencies remain strictly factual: conversion of intercepts to mineable resources depends on how these results modify Measured and Indicated volumes and grade (the release notes an average planned mine grade of 0.566 g/t Au for Measured and Indicated), and column test outcomes will determine recoveries and operating assumptions. Watch for updated resource statements, metallurgical column test results, and the Feasibility Study deliverables before year end; those are the concrete milestones the release links to and that will materially change project valuation over the coming months.

Lead, South Dakota--(Newsfile Corp. - October 16, 2025) - Dakota Gold Corp. (NYSE American: DC) ("Dakota Gold" or the "Company") 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 ("Richmond Hill" or the "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

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/8218/270624_e6ecc47a64a63a31_002full.jpg

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

Hole #	From (m)	To (m)	Interval (m)	Grade (g/t)	g x m	From (ft)	To (ft)	Interval (ft)	Grade (oz/ton)	Program
RH25C-195	4.3	13.5	9.2	1.05	10	14.0	44.3	30.3	0.031	Metallurgical
	20.7	24.7	4.0	0.73	3	68.0	81.0	13.0	0.021
	28.9	49.7	20.8	0.9	19	94.7	163.0	68.3	0.026
	80.6	84.5	3.9	0.99	4	264.5	277.3	12.8	0.029
	88.1	104.3	16.2	0.7	11	289.1	342.1	53.0	0.021
	108.2	140.3	32.1	1.21	39	355.0	460.4	105.4	0.035
RH25C-201	39.1	46.4	7.3	0.83	6	128.2	152.1	23.9	0.024	Metallurgical
	112.6	131.1	18.5	0.7	13	369.4	430.0	60.6	0.020
RH25C-206	10.0	13.1	3.1	0.7	2	32.7	43.0	10.3	0.020	Metallurgical
	22.4	31.2	8.8	1.03	9	73.6	102.4	28.8	0.030
	34.3	46.2	11.9	0.73	9	112.5	151.7	39.2	0.021
RH25C-207	15.1	48.6	33.5	1.31	44	49.4	159.4	110.0	0.038	Metallurgical
RH25C-209	14.3	87.5	73.5	1.4	103	47.0	287.0	241.0	0.041	Metallurgical
	90.5	101.5	11.0	0.64	7	297.0	333.0	36.0	0.019
	104.5	121.2	16.6	1.73	29	343.0	397.5	54.5	0.050
	144.2	177.1	33.0	1.1	36	473.0	581.2	108.2	0.032
	181.8	189.8	8.0	0.7	6	596.6	622.7	26.1	0.020
RH25C-211	16.2	68.5	52.3	1.55	81	53.0	224.7	171.7	0.045	Metallurgical
RH25C-215	17.6	25.3	7.7	0.6	5	57.8	83.0	25.2	0.017	Metallurgical
	28.3	71.0	42.7	1.72	74	93.0	233.0	140.0	0.050
RH25C-217	17.5	22.3	4.8	0.71	3	57.4	73.2	15.8	0.021	Infill
	30.4	33.6	3.2	0.72	2	99.6	110.2	10.6	0.021
	40.8	44.5	3.7	1.25	5	133.7	146.0	12.3	0.037
	48.2	52.4	4.3	1.0	4	158.0	172.0	14.0	0.029
RH25C-218	No Significant Results									Met/Geotech
RH25C-221	51.0	77.1	26.1	0.89	23	167.3	253.0	85.7	0.026	Metallurgical
	94.5	101.3	6.7	0.58	4	310.2	332.3	22.1	0.017
RH25C-223	55.5	77.5	22.0	1.1	24	182.0	254.3	72.3	0.032	Metallurgical
	80.7	85.6	4.9	0.68	3	264.8	281.0	16.2	0.020
	90.5	94.7	4.2	1.41	6	296.9	310.8	13.9	0.041
RH25C-225	13.3	21.1	7.8	1.83	14	43.7	69.3	25.6	0.053	Metallurgical
	29.6	35.0	5.4	0.74	4	97.1	114.9	17.8	0.021
	42.3	47.6	5.3	1.03	5	138.8	156.1	17.3	0.030
	52.2	58.7	6.5	1.19	8	171.4	192.6	21.2	0.035
	78.5	97	18.6	0.89	17	257.4	318.3	60.9	0.026
RH25C-229	15.1	19.6	4.5	0.68	3	49.7	64.4	14.7	0.020	Metallurgical
	33.6	42.8	9.2	0.65	6	110.3	140.4	30.1	0.019
	50.6	52.1	1.5	9.42	14	166.0	170.9	4.9	0.275
	102.7	105.8	3.0	0.66	2	337.0	347.0	10.0	0.019
RH25C-232	20.3	26.8	6.6	2.26	15	66.5	88.0	21.5	0.066	Metallurgical
	38.2	51.6	13.5	0.84	11	125.2	169.4	44.2	0.024
	58.4	73.7	15.3	1.17	18	191.5	241.8	50.3	0.034
RH25C-234	14.9	20.8	5.9	2.18	13	49.0	68.4	19.4	0.064	Metallurgical
	34.3	62.6	28.3	1.88	53	112.5	205.3	92.8	0.055
	74.5	89.8	15.3	1.31	20	244.4	294.6	50.2	0.038
RH25C-237	30.1	31.5	1.5	12.45	18	98.7	103.5	4.8	0.363	Metallurgical
	65.0	72.2	7.2	1.43	10	213.4	237.0	23.6	0.042
	75.9	87.5	11.6	0.98	11	249.1	287.2	38.1	0.029
RH25C-239	145.1	151.2	6.2	4.48	28	476.0	496.2	20.2	0.131	Infill
inc.	146.6	148.1	1.5	10.95	16	481.1	486.0	4.9	0.319
RH25C-241	177.3	197.8	20.5	3.72	76	581.8	649.1	67.3	0.109	Infill
inc.	191.8	193.2	1.5	28.2	41	629.2	634.0	4.8	0.823
RH25C-242	4.4	16.9	12.4	1.37	17	14.5	55.3	40.8	0.040	Metallurgical
	21.2	24.4	3.1	2.44	8	69.6	79.9	10.3	0.071
	29.7	39.7	10.1	1.19	12	97.3	130.3	33.0	0.035
RH25C-243	0	10.8	10.8	1.67	18	0	35.3	35.3	0.049	Metallurgical
	16.9	24.1	7.2	0.87	6	55.4	79.0	23.6	0.025
RH25C-244	No Significant Results									Infill
RH25C-245	0	12.8	12.8	1.38	18	0	42.0	42.0	0.040	Metallurgical
	15.8	23.3	7.5	1.21	9	51.9	76.4	24.5	0.035
RH25C-246	4.2	23.6	19.4	1.25	24	13.7	77.4	63.7	0.036	Metallurgical
RH25C-248	9.9	12.2	2.3	1.87	4	32.5	40.1	7.6	0.055	Metallurgical
	21.5	28.5	7.0	0.83	6	70.5	93.4	22.9	0.024
RH25C-250	6.1	13.5	7.4	1.48	11	20.1	44.4	24.3	0.043	Metallurgical
	17.6	25.1	7.5	0.79	6	57.8	82.3	24.5	0.023
RH25C-251	5.7	17.2	11.6	1.65	19	18.6	56.5	37.9	0.048	Metallurgical
	20.3	37.0	16.7	0.8	13	66.6	121.3	54.7	0.023
RH25C-253	4.0	27.9	23.9	0.77	18	13.0	91.4	78.4	0.022	Metallurgical
RH25C-254	8.5	19.0	10.5	1.15	12	28.0	62.4	34.4	0.034	Metallurgical
	22.2	31.8	9.6	0.86	8	72.7	104.3	31.6	0.025
RH25C-257	57.3	63.9	6.5	0.64	4	188.1	209.5	21.4	0.019	Metallurgical
RH25C-259	35.3	56.2	20.9	1.69	35	115.7	184.4	68.7	0.049	Metallurgical
	68.1	79.7	11.6	0.86	10	223.3	261.5	38.2	0.025
	83.6	92.4	8.8	2.32	20	274.2	303.0	28.8	0.068
RH25C-266	54.6	74.6	20.1	1.02	20	179.0	244.8	65.8	0.030	Metallurgical
RH25C-272	9.8	14.1	4.6	0.8	4	32.0	47.0	15.0	0.023	Metallurgical
	18.9	32.5	14.1	1.02	14	62.0	108.1	46.1	0.030

 

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 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/270624

FAQ

What drill results did Dakota Gold (DC) report on October 16, 2025 for Richmond Hill?

Dakota Gold reported assays from 32 holes, including RH25C-241: 3.72 g/t Au over 20.5 m and metallurgical holes like RH25C-209: 1.40 g/t Au over 73.5 m.

How much drilling is Dakota Gold planning at Richmond Hill in 2025 (DC)?

The company expects to drill approximately 27,500 meters (~90,000 feet) during the 2025 campaign.

Do Dakota Gold's October 2025 assays support the planned initial mining at Richmond Hill (DC)?

Yes; results concentrated in the northern Project area are presented as supporting the company's plan to target the north for initial years of mining and to inform the Feasibility Study.

What average grade does the Richmond Hill Measured and Indicated mine plan report for DC?

The reported average grade for the Measured and Indicated mine plan is 0.566 g/t Au.

Will the 2025 core drilling at Richmond Hill provide metallurgical samples for DC's Feasibility Study?

Yes; core drilling is designed to collect metallurgical samples for column testing and to refine geo-metallurgical domains for the Feasibility Study.