Kalgoorlie Gold Mining (ASX: KAL) has reported strong results from its latest reverse circulation (RC) drilling program at the Lighthorse prospect, confirming a significant extension of primary gold mineralisation along strike.
The new drilling has increased the defined strike length of primary mineralisation to more than 1,100 metres, up from less than 600m the company outlined in its initial RC program.
Results validate earlier aircore drilling that identified a near-surface gold anomaly approximately 1,600m long, and demonstrate that this anomalism is sourced from a primary orogenic gold system at depth.
The mineralised system remains open to the north, where supporting geophysical features extend beyond the limits of current drilling.
Primary Gold Mineralisation
The second RC drilling campaign at Lighthorse comprised 38 holes for a total of 4,494m, and aimed to follow up aircore anomalism and sub-audio magnetic geophysical targets.
Drilling intersected extensive zones of primary orogenic gold mineralisation in fresh rock, with mineralisation directly associated with shearing, alteration, sulphide development, and quartz veining.
Gold-bearing intervals up to 35m thick highlighted the scale and continuity of the mineralised system, with significant intercepts including 15m at 1.14 grams per tonne gold from 84m, 35m at 0.33g/t gold from 90m, and 35m at 0.42g/t gold from 78m.
Managing director Matt Painter described the results as “consistent with the company’s targeting strategy for large-scale deposits in the Pinjin region, east of Kalgoorlie.”
Strong Geophysical Correlation
The gold mineralisation shows a strong spatial correlation with a north–south trending magnetometric conductivity ridge identified in the recent sub-audio magnetic survey, with the most continuous and thick mineralised zones coinciding with areas of elevated conductivity and subdued magnetic response.
The conductivity ridge continues north of the current drilling footprint, supporting the interpretation that the primary gold system extends further along strike.
In the northern Lighthorse area, mineralised zones remain open to the north and have only been tested by widely spaced first-pass drilling.
Current RC holes are generally shallow, with most extending only 80m to 120m below surface, leaving the depth extent of primary mineralisation poorly constrained.
Kalgoorlie plans to conduct infill and extensional RC drilling in early 2026 to better define the geometry, continuity, and depth potential of the system, increasing the drilling depths in selected holes to assess the extent of primary gold mineralisation below the zone of near-surface depletion.
Southern Extent Tested
To the south of Lighthorse, RC drilling intersected sub-grade and discontinuous gold anomalism, marking the approximate southern limit of contiguous mineralisation, while additional RC drilling at the Wessex and Providence South prospects followed up earlier aircore results from 2024.
At Providence South, narrow primary gold intercepts were returned near the ultramafic unit hosting the Kirgella Gift and Providence deposits, although deeper drilling at Wessex failed to confirm significant primary gold beneath earlier near-surface anomalism.
Diamond drilling at Kirgella Gift and Providence is ongoing, with drill core currently being logged and processed, and initial samples submitted for assay.
Kalgoorlie has received an initial 80% refund under the Exploration Incentive Scheme following submission of its interim post-program report.
The company plans to report results from the diamond drilling program once all assay data has been received and compiled.
