Dakota Gold (NYSEAmerican:DC) has just released exciting news about its Richmond Hill Gold Project. The company has announced the results from five additional drill holes, which have delineated an extensive gold system more than a mile in length from north to south, with the gold mineralization open in all directions.
The latest drilling at Richmond Hill aimed to locate higher-grade gold mineralization, particularly at the intersection of a dominant north-south structure with northeast-southwest crossing structures within the Twin Tunnels Breccia Pipe. The results of drill hole RH22C-013 are impressive, with an intersection of 0.175 oz/ton Au over 98.5 feet (5.98 grams/tonne over 30.0 meters). This confirms the existence of higher-grade gold mineralization, which may be related to preferential structures.
The Richmond Hill Gold Project consists of six known breccia pipes, four of which remain largely untested. To date, Dakota Gold has only drill-tested the Twin Tunnels and Twin Tunnels West Breccia Pipes. However, both of these are open to extension at depth and laterally to the north and south. It is important to note that between 1988 and 1994, LAC Minerals produced an impressive 175,000 ounces of gold from the Richmond Hill Breccia Pipe, which is similarly open to extension.
James M. Berry, Vice President of Exploration of Dakota Gold, commented in a press release: “Richmond Hill continues to provide positive drill results with RH22C-013 confirming the presence of higher-grade gold mineralization in the Twin Tunnels Breccia Pipe. We are seeing large intervals of visible alteration in the drilling and are using historical drilling, geophysics, and surface mapping to test the known breccia pipes for better grade mineralization. Four previously known breccia pipes remain untested.”
Highlights from the results are as follows:
- RH22C-013 intersected 0.175 oz/ton Au over 98.5 feet (5.98 grams/tonne over 30.0 meters) in a Tertiary breccia and confirmed the presence of higher-grade gold mineralization at Richmond Hill in the Twin Tunnels Breccia Pipe and confirms higher-grade gold mineralization found in historical drill hole TT-86-26.
- RH23C-014 intersected 0.039 oz/ton Au over 137.8 feet (1.35 grams/tonne over 42.0 meters) in the Twin Tunnels West Breccia Pipe. RH23C-014 was designed to test the Twin Tunnels West Breccia Pipe closer to the surface.
- RH22C-009 intersected 0.035 oz/ton Au over 16.8 feet (1.21 grams/tonne over 5.1 meters) in the Twin Tunnels Breccia Pipe. RH22C-010 intersected 0.024 oz/ton Au over 50.6 feet (1.24 grams/tonne over 1.54 meters) 2,500 feet west of the Twin Tunnels West Breccia Pipe. RH22C-011 intersected 0.036 oz/ton Au over 50.6 feet (1.24 grams/tonne over 15.4 meters) in the Twin Tunnels Breccia Pipe.
- Dakota Gold has identified a large gold system at Richmond Hill with drilling underway to test the remaining breccia pipes. Tertiary breccia pipes are favorable conduits for gold bearing fluids in the Homestake District and continue to be a priority drill target. Drilling and geologic reinterpretation has demonstrated two large breccia pipes are one larger system.
The Company currently has four drills operating on its properties in the Homestake District of South Dakota, with two drills operating at the Maitland Gold Project (“Maitland”) targeting Homestake-hosted and Tertiary gold mineralization.
Two drills operating at Richmond Hill are targeting Tertiary breccia and replacement gold mineralization, as well as conducting infill and step-out drilling designed to convert and expand the known gold mineralization identified in 880 historic drill holes, to S-K 1300 compliant resources.
Richmond Hill is located 2.3 miles west of Maitland and 1.5 miles north of Coeur Mining, Inc.’s Wharf Mine. The Wharf Mine produced 79,768 ounces at 0.021 oz/ton gold in 2022.
RH22C-009 was drilled to test between RH22C-005 and RH22C-006 (see December 8, 2022 press release) at the Twin Tunnels Breccia Pipe as shown in Figure 1 and Figure 2. The drill hole intersected multiple zones of mineralization as shown in Table 1, with the best interval intersecting 0.022 oz/ton Au over 76.9 feet (0.77 grams/tonne over 23.4 meters). The mineralization was hosted within a Tertiary breccia composed of altered or bleached Precambrian, greenstone clasts.
RH22C-010 was drilled to test an area 2,500 feet west of the Twin Tunnels West Breccia Pipe as shown in Figure 1 for historically identified Tertiary replacement gold mineralization hosted in the Cambrian Deadwood Formation and the Precambrian stratigraphy. This drill hole intersected 0.024 oz/ton Au over 18.7 feet (0.82 grams/tonne over 5.7 meters) in a fractured Tertiary lamprophyre sill. RH22C-010 also intersected 0.016 oz/ton Au over 13.1 feet (0.55 grams/tonne over 4.0 meters) in the lower Deadwood Formation. The lower portion of the drill hole contained Precambrian greenstone.
RH22C-011 was drilled to test below RH22C-009, intersecting 0.036 oz/ton Au over 50.6 feet (1.24 grams/tonne over 15.4 meters) in Tertiary breccia and is shown in Figure 2. RH22C-011 also intersected 0.021 oz/ton Au over 54.9 feet (0.74 grams/tonne over 16.7 meters) in the lower Deadwood Formation and Tertiary altered Precambrian phyllites below the unconformity. The drill hole also intersected 0.017 oz/ton Au over 75.1 feet (0.57 grams/tonne over 22.9 meters) and 0.024 oz/ton Au over 52.8 feet (0.84 grams/tonne over 16.1 meters) in Tertiary breccias with Precambrian greenstone clasts.
RH22C-013 was drilled to test for higher-grade gold mineralization at the Twin Tunnels Breccia Pipe. The drill hole was drilled from the same pad as RH22C-012 (see December 8, 2022 press release) at a shallower angle. RH22C-013 intersected 0.175 oz/ton Au over 98.5 feet (5.98 grams/tonne over 30.0 meters) in oxidized Tertiary breccia and fractured Precambrian phyllites as shown in Figure 3 and 4. The drill hole also intersected 0.039 oz/ton Au over 33.4 feet (1.33 grams/tonne over 10.2 meters) in Tertiary breccia. RH22C-013 demonstrates the potential for higher gold grades within the breccia pipes at Richmond Hill.
RH23C-014 was drilled to test the upper portion of the Twin Tunnels Breccia Pipe above RH22C-005 as shown in Figures 1 and 5. RH22C-014 intersected 0.028 oz/ton Au over 88.9 feet (0.95 grams/tonne over 27.1 meters), 0.039 oz/ton Au over 137.8 feet (1.35 grams/tonne over 42.0 meters), and 0.023 oz/ton Au over 84.9 feet (0.77 grams/tonne over 25.9 meters), extending the Tertiary breccia hosted mineralization intersected in RH22C-005 closer to the surface.
Table 1. RH22C-009, RH22C-010, RH22C-011, RH22C-013 and RH23C-014 Drill Results (Imperial / Metric Units)
|Hole #||From||To||Depth||Interval*||Gold||From||To||Depth||Interval*||Gold||Mineral Type|
*True thickness is unknown.
Abbreviations in the table include ounces per ton (“oz/ton”); grams per tonne (“g/t”); feet (“ft”); meter (“m”); Tertiary (“Tert”); Cambrian (“Ꞓ”); Breccia (Bx) and Precambrian (“pꞒ”).