North Stawell Minerals Confirms Darlington Gold Structure Open at Depth
Key Takeaways
- Diamond drill hole NSD063 intersected the same brecciated vein texture as high-grade holes NSD062 (0.4m at 17.1 g/t Au) and NSD057 (2.3m at 29.18 g/t Au), confirming structural continuity across the Darlington trend.
- Five diamond drill holes have now defined a steep west-dipping planar structure at Darlington that remains open at depth and open along strike to the north for at least 200m.
- The geological model targets a potential connection between the Darlington vein system and drill-confirmed basalt at depth — the same structural relationship that links the Mariners Lodes to the broader 5Moz Stawell Gold Mine.
- Three additional parallel mineralised structures have been identified at Darlington, including the Historic Darlington Mine trend (2,347 oz at 18 g/t Au historic production) and Darlington West, where geophysics indicates a host basalt at least 700m long and 400m wide.
- NSM's broader tenement portfolio covers 445km² along the Stawell corridor, with at least 20 additional basalts identified, 12 carrying associated gold mineralisation, and five classified as current priorities.
Darlington drilling confirms structure grows at depth
Diamond drill hole NSD063, the final hole in a recent diamond drill program at the Darlington Prospect 6km north of Stawell, Victoria, has returned 0.5m at 1.16 g/t Au from 129.6m, accompanied by strong arsenic (As) readings. The result is narrow, but its significance lies in what it confirms structurally rather than the grade alone.
To understand why, the result needs to be read alongside two prior holes on the same trend. North Stawell Minerals (ASX:NSM) previously reported 0.4m at 17.1 g/t Au from 98.6m in NSD062 (40m up-dip from NSD063) and 2.3m at 29.18 g/t Au from 108.2m in NSD057 (70m along strike to the south), including a high-grade sub-interval of 0.8m at 82 g/t Au from 108.2m.
NSD063 intersected the same brecciated vein texture observed in both NSD062 and NSD057, supporting the geological interpretation of a steep west-dipping vein system. Five diamond drill holes have now intersected this target, collectively defining a planar structure that remains open at depth.
The high-grade gold results at Darlington, including the 0.8m at 82 g/t Au sub-interval from NSD057, established the structural context that makes NSD063 interpretable as confirmation of a growing system rather than an isolated intersection.
Bill Reid, Executive Director
“Diamond drill hole NSD063 has intersected the right mineralised structure beneath a prior high-grade intercept in NSD062 and approximately 70 m along strike from NSD057. The host is brecciated quartz flooded, brecciated veining in carbonaceous sediments. Five diamond drill holes have intersected the target and define a steep-dipping, planar structure that remains open at depth…”
The significant intercepts from NSD063 are set out below:
| Hole ID | Depth From (m) | Depth To (m) | Interval* (m) | Gold Intercept (g/t Au) | Arsenic Intercept (ppm As) | Comment |
|---|---|---|---|---|---|---|
| NSD063 | 129.6 | 130.1 | 0.50 | 1.16 | 3,849 | Carbonaceous breccia |
| NSD063 | 189.0 | 189.5 | 0.50 | 0.80 | 724 | Carbonaceous breccia |
| NSD063 | 199.75 | 200.1 | 0.35 | 0.42 | 742 | Carbonaceous breccia |
| NSD063 | 256.7 | 257.1 | 0.40 | 0.54 | 7,307 | Laminated quartz vein |
Widths are down-hole intervals. Assuming intercepts are subparallel to the regional trend, true thickness may be 70–80% of the recorded interval thickness.
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Understanding what Darlington could become
The Mariners Lodes model — why this matters
NSM’s exploration logic at Darlington is anchored in a well-documented geological precedent sitting 6km to the south: the historic Mariners Lodes at Stawell. Understanding this model is the key to reading what the company is actually looking for.
The Mariners Lodes were the original focus of gold mining at Stawell, mined between 1856 and 1880. Around 30 historic shafts were sunk along an 1,100m trend to depths of up to 500m, yielding reported historic production of 740,000–950,000 oz Au at an average grade of 28–30 g/t Au. The mineralisation style was brecciated, faulted quartz-veining with visible gold in carbonaceous sediments — the same texture NSM is intersecting at Darlington right now.
What makes the model particularly compelling is what happens at depth. At Stawell, the Mariners Lodes eventually connected to basalt-margin mineralisation (known as Stawell-type) at depth, linking the shallower sediment-hosted system to the broader multi-million-ounce deposit. NSM believes Darlington may follow the same pattern: that the vein system being traced by drilling could, at depth, intersect the drill-confirmed basalt beneath and potentially connect to a larger mineralised system on the basalt margins.
The regional benchmark underpinning all of this is the Stawell Gold Mine itself, which has produced more than 5Moz Au historically. The Darlington structure currently remains open at depth and open along strike to the north for at least 200m.
Multiple targets building across the Darlington trend
Darlington is not a single-hole story. Three other parallel mineralised structures have been identified at Darlington, and all remain open along strike and at depth:
-
NSD063 trend (this hole): Steep-dipping structure confirmed open at depth. The priority future target is where this structure intersects the deeper, drill-confirmed basalt beneath.
-
Historic Darlington Mine trend (70m east of NSD063): Historic production of 2,347 oz at 18 g/t Au. Prior NSM drilling returned 4.0m at 10.77 g/t Au from 60.0m (NSAC0527) and 6.0m at 3.45 g/t Au from 42.0m (NSAC0532). The target is open at depth, with drilling having intersected a deeper, altered basalt beneath the gold system.
The shallow high-grade drilling programme that preceded this diamond drill campaign tested the near-surface expression of the Darlington corridor, with air core results helping constrain the structural geometry that diamond drilling is now extending to depth.
- Darlington West (200m west of NSD063): Gold intercepts on the margin of a previously undrilled basalt, potentially indicative of Stawell-type (basalt-margin) mineralisation. Geophysics indicates the host basalt is at least 700m long and 400m wide. A recent IP survey identified a strong, untested response 300m to the south on the interpreted basalt margin position. Prior results include 0.5m at 6.01 g/t Au from 283.35m (NSD058) and 1.2m at 3.32 g/t Au from 177.3m (NSD061).
The broader NSM tenement portfolio covers 445km² along the gold-prospective Stawell corridor. The company has identified at least 20 additional basalts within the portfolio, 12 of which have associated gold mineralisation, with five classified as current priorities. These include Wildwood, which holds an 87koz Mineral Resource that remains open at depth.
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What comes next for NSM at Darlington
NSM has indicated that a follow-up drilling programme will be designed during the next quarter. Before deeper drilling can proceed, the company has stated that understanding the plunge of the high-grade gold shoot is a prerequisite.
The point where the Darlington structure intersects the deeper, drill-confirmed basalt is identified as a high-priority future drilling target. IP surveying is being considered to help delineate the trend, given that the silicification style of mineralisation is considered well-suited to that technique. High-resolution, multi-element geochemistry has already been returned and will also help target chemical fingerprints that could sharpen future targeting.
NSM has stated that Darlington remains the primary exploration focus given the structural and mineralisation similarities to the Mariners Lodes. The company also noted that at least 20 additional basalts have been identified across the tenement portfolio, each considered to have potential to host similar mineralisation.
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