North Stawell Minerals has extended a steep west-dipping gold-bearing structure at Darlington with a 0.5-metre intercept, though the latest grade is well below nearby high-grade results. The company says the trend remains open at depth and along strike, with further drilling needed to test its potential scale.
- 0.5m at 1.16 g/t gold from 129.6m in NSD063
- Intercept sits 40m down-dip from 17.1 g/t result in NSD062
- Darlington structure remains open at depth and along strike
- Three parallel mineralised structures also remain untested or open
- No Mineral Resource has been defined at the prospect
Darlington Structure Extended Down-Dip
North Stawell Minerals (ASX:NSM) has added another intersection to the Darlington gold story north of Stawell, but the result is more about geological continuity than immediate grade excitement. Diamond hole NSD063 returned 0.5 metres at 1.16 g/t gold from 129.6 metres, with arsenic of 3,849 parts per million.
The intercept sits 40 metres down-dip from NSD062, which returned 0.4 metres at 17.1 g/t gold, and about 70 metres along strike from NSD057’s 2.3-metre intercept at 29.18 g/t, including 0.8 metres at 82 g/t. Those earlier results provide the high-grade reference point; NSD063 is narrower and materially lower grade, making the emerging geometry more significant than the assay itself.
Steep Vein System Remains Open
NSM says NSD063 cut the same brecciated quartz-vein texture identified in the earlier holes, supporting its interpretation of a steep west-dipping, planar mineralised structure. Five diamond holes have now intersected the target, which remains open at depth, at least 200 metres to the north and to the south.
The hole also encountered weaker gold and arsenic mineralisation deeper in the sequence, including 0.5 metres at 0.8 g/t gold from 189 metres, 0.35 metres at 0.42 g/t from 199.75 metres and 0.4 metres at 0.54 g/t from 256.7 metres. NSM says this broader low-grade system may develop as the vein approaches deeper basalt, although that remains an exploration interpretation rather than a defined resource.
Multiple Basalt-Linked Targets Add Scale
The company is using the historic Mariners Lodes at the Stawell Gold Mine as its exploration model. Those lodes were mined above a deeper basalt and are described in the announcement as having produced between 740,000 and 950,000 ounces at an average grade of 28-30 g/t gold. NSM believes Darlington’s carbonaceous sediments, brecciated quartz veining and structural setting show similarities, while acknowledging that the comparison does not establish an equivalent deposit.
Darlington is not a one-trend proposition. The historic Darlington Mine trend lies about 70 metres east of NSD063 and recorded historic production of 2,347 ounces at 18 g/t gold. Darlington West, roughly 200 metres to the west, has also produced gold-bearing intercepts on the margin of a previously undrilled basalt. Three additional parallel mineralised structures have been identified, all described as open along strike and at depth.
Follow-Up Drilling Must Convert Geometry into Scale
NSM says it will design a program to assess the new mineralisation trend during the next quarter, with future work expected to consider air drilling, induced-polarisation surveying and multi-element geochemistry. The company’s broader Victorian portfolio covers 445 square kilometres and includes at least 20 identified basalts, 12 of which have associated gold mineralisation.
The immediate test is whether follow-up holes can connect the narrow intersections into a coherent mineralised envelope and establish a repeatable high-grade shoot. The reported intervals are down-hole widths, with estimated true thickness generally 70-80% of the recorded figures, and the company expressly cautions that Darlington’s exploration potential remains conceptual: no Mineral Resource has yet been defined.
Bottom Line?
NSD063 strengthens the case for more drilling at Darlington, but the next catalyst is evidence of sustained width, grade and continuity rather than another isolated intersection.
Questions in the middle?
- Can follow-up drilling demonstrate a coherent high-grade shoot rather than separate narrow intersections?
- Does the mineralised structure connect with the deeper basalt margin as NSM expects?
- Will future drilling support a Mineral Resource, or leave Darlington as a conceptual exploration target?