Recent Reports:
February 6, 2025 - S-K 1300 Initial Assessment and Technical Report Summary for Richmond Hill - View here
July 7, 2025 - S-K 1300 Initial Assessment Technical Report with Cash Flow (IACF) - View here
Richmond Hill Gold Project
Background and Ownership Rights
The Richmond Hill Project is comprised of more than 3,000 acres of private surface and mineral. It includes the past-producing Richmond Hill mine and the historical mines of the Carbonate District, as well as multiple prospective areas where gold has been drillintersected. The Richmond Hill mine is in the historical Carbonate Mining District approximately five miles northwest of Lead, South Dakota, in the northern Black Hills. Mining in the area started in the 1870s, during the gold-rush era, and continued until the silver price collapsed in the 1880s. Prior to 1981, the Richmond Hill land package included most of the Carbonate camp. Between the 1980s and 1990s, various companies conducted exploration of the area. Barrick acquired the property in 1994. Multiple facilities related to the historical Richmond Hill mine still exist on the Richmond Hills Project, including a water treatment plant and maintenance and storage buildings. Containment ponds are still operational, although an impermeable clay membrane has capped the open pit and leach pads. One of three wells that supplied water to the Richmond Hill mine is still active. There is a public access road to the site and a power line to operate the current water treatment facilities. As the site is in reclamation, there is no current book value associated with the assets for Barrick. On October 14, 2021, Dakota Gold entered into an option agreement (the “Richmond Hill Option Agreement”) to acquire 100% of Barrick’s interest in the Richmond Hill Property (the “Richmond Hill Option”). Under the original terms of the Richmond Hill Option Agreement, Dakota Gold had a three-year option to acquire 2,126 acres of surface and mineral rights with attendant facilities. In consideration for the Richmond Hill Option, Dakota Gold agreed to issue 400,000 shares of Dakota Gold common stock to Barrick and made annual option payments of $100,000 during the option period. Under the original terms of the Richmond Hill Option Agreement, Dakota Gold had the right to exercise the Richmond Hill Option on or before September 7, 2024, by assuming all liabilities and bonds associated with the Richmond Hill Property. In addition, on exercise of the Richmond Hill Option, Dakota Gold will issue Barrick an additional 400,000 shares of Dakota Gold common stock and grant a 1% net smelter royalty (“NSR”) to Barrick with respect to any minerals that may be recovered from the Richmond Hill Property. In September 2023, Dakota Gold and Barrick amended the Richmond Hill Option Agreement to extend the option period to March 7, 2026 and increase the Richmond Hill Project size by an additional 489 mineral acres, bringing the total mineral acreage for the Richmond Hill Project to approximately 2,615 mineral acres at that time. On February 6, 2025, the Company announced that Barrick had agreed to extend the option period for the Richmond Hill Option Agreement until December 31, 2028, in return for additional annual cash payments of $170,000 on each of March 1, 2026, March 1, 2027 and March 1, 2028. In addition to the Richmond Hill Option Agreement properties, the Company has shifted management of 387 acres of previously owned surface and mineral rights from contiguous parcels of land previously included in the adjoining West Corridor Gold Project to the Richmond Hill Project, thereby increasing the total Richmond Hill Project to approximately 3,002 mineral acres.
Location and Access
The Richmond Hill Project is located in the western portion of Lawrence County, South Dakota, USA. More specifically the property lies within the Black Hills Meridian, Township 5N, Range2E covering portions of Sections 9, 10, 11, 13. 14, 15, 16, 21, 22, 23, 24, 26, 27, and 34. The property is contiguous to Dakota Gold's West Corridor and Blind Gold Properties and is located approximately 1/2 mile north of the producing Wharf Gold Mine (Coeur Mining). Access to the property is gained by traveling 1 mile southwest of Lead SD on Highway 85/14A to State Highway 473 and then traveling west approximately 3.2 miles to Wharf Mine Road and continuing west approximately 1.2 miles before turning and traveling 1 mile north on the Richmond Hill Road.
Richmond Hill Project Location
The property is within five miles of the towns of Lead and Deadwood. Dakota Gold has its base of operations in Lead, with separate facilities for office and core processing. The City of Spearfish, SD, is within 20 miles of the Richmond Hills Project. The cities of Sturgis and Rapid City are within 40 miles of the Richmond Hill Project. Most supplies can be obtained from Rapid City or Spearfish. Personnel for exploration or development programs may be sourced from or housed in the four nearby communities. A 69 Kv transmission line supplies power to communities, and internal power is supplied by a 12.47 Kv line to the Richmond Hill Gold Project site. Major transportation systems, including road, rail, and air, exist proximally to the northern Black Hills. Rapid City has a major rail freight station and regional airport, while an Interstate highway passes through the city and wraps around the northern end of the Black Hills. Multiple facilities related to the historical Richmond Hill mine still exist on the Richmond Hills Project, including a water treatment plant and maintenance and storage buildings. Containment ponds are still operational, although an impermeable clay membrane has capped the open pit and leach pads. Water for exploration drilling programs has been sourced locally and either pumped or trucked to the drills. One of three wells that supplied water to the Richmond Hill mine is still active.
Prior Exploration and Operations
Modest historical mining activities occurred on the Richmond Hill Project during the late 19 th century. During this time, the only known production from the Richmond Hill Project was from the Carbonate camp, which was primarily mined for lead and silver. The bulk of this production was from the Iron Hill mine. The mining was such that it supported a nearby town and smelter. Mining continued in this area until the silver price collapsed in the 1880s. An estimated 2,500 ounces of gold were produced from the Spanish R mine on the western side of the camp in the late 1800s. More recently, Bond Gold (later acquired by LAC Minerals) produced gold and silver doré from the property beginning in 1988. The last mineralized material was hauled from the Richmond Hill mine pit in 1993 and efforts then shifted to reclamation activities. During this time, an estimated 172,294 ounces of gold and 212,610 ounces of silver were produced from the property.
Geological Setting and Mineralization
The Black Hills of southwestern South Dakota is an isolated mountain range rising from the Great Plains of North America and extending north northwest into Wyoming. Several small rivers cut through the range, describing a roughly radial pattern, though most drainage is to the east. An ecological crossroad, the Black Hills contains wildlife and plant species typical of habitats of the Rocky Mountains, Great Plains, northern boreal forests, and eastern deciduous forests. The Richmond Hill Project sits at an altitude of approximately 6,000 feet, and the historical leach pad area is at approximately 5,600 feet elevation, about one mile north of the pit area. The Richmond Hill area is an important component of Dakota Gold's exploration strategy for the Homestake District. The property includes the past producing Richmond Hill mine and the mines of the Carbonate District. The Richmond Hill mine produced ore from Tertiary breccias dominantly hosted within Precambrian units that were processed as an open pit, heap leach operation. Tertiary-aged replacement gold mineralization, as well as possible Precambrian iron formation hosted mineralization were identified during exploration programs in the 1980s and 1990s. Gold mineralization in breccia pipe bodies had previously been identified in the Richmond Hill, Richmond Hill North, Twin Tunnels, and Turnaround Breccia Pipes by LAC Minerals (USA) LLC. Dakota Gold followed up on this earlier work, and, by the end of 2023, completed 72 drill holes for a total of 116,966 feet (35,651 meters) which tested portions of the Twin Tunnels, Turnaround and Richmond Hill Breccia Pipes. Only three of the six known breccia pipes exposed at the Richmond Hill Project have been subject to any drilling by the Company and all of the known breccia pipes on the Richmond Hill Project remain open and/or lack drill testing to depth. In 2024, the Company completed an additional 80 drill holes resulting in a grand total of 152 holes at Richmond Hill and 160,902 feet (49,043 meters). This drilling was split between infill and step out drilling in the central Richmond Hill resource area and the Chism Gulch target area, a shallow oxide portion of the orebody in carbonate replacement deposits located adjacent to but northeast of the main breccia pipe orebodies. Breccia pipes are associated with the Tertiary alkalic magmatism that generated most of the Tertiary-aged gold deposits hosted in pipes-shapes breccias, basement metamorphic rocks, Tertiary intrusive and carbonate replacement deposits in the overlying Paleozoic sedimentary rocks throughout the Homestake District. A portion of the Richmond Hill deposit is comparable to the mineralization being mined at the nearby Wharf open pit gold mine.
Permitting
The Company holds the permits required to conduct the infill and expansion drilling at the Richmond Hill Project that has been conducted to date. Future exploration and development drilling may require additional permits, which we currently anticipate we will be able to obtain in the ordinary course. Any future development or exploitation of the Richmond Hill Project would require significant additional regulatory review and future permits.
