Legacy Minerals (ASX:LGM) has defined three untested chargeability targets at its Rockley Project in New South Wales, with the priority target returning responses of up to 45 millivolts per volt (mV/V) over an 800m strike length.
The induced polarisation (IP) survey at the Crystal Hill prospect identified three discrete zones exceeding 35mV/V, none of which have been drill tested.
The Central target is the highest priority — a north-northwest-trending zone modelled from about 100m depth and coincident with the Crystal Hill soil geochemistry anomaly.
The North-West target shows a response of more than 40mV/V modelled from about 200m depth, while the East target is a 35mV/V zone at about 200m depth within a resistive zone. Chargeability can reflect disseminated sulphide mineralisation, alteration, or other lithological variation, and requires drill testing to determine its source.
Rock-chip samples at Crystal Hill returned up to 9.3% copper, 3.9 grams per tonne gold, and 415g/t silver. None of the three IP targets have been tested by historical drilling.
“It’s hard to ask for better drill targets than these three clear, untested copper targets at Rockley,” Managing Director Christopher Byrne says.
“The most compelling target sits directly beneath the copper, gold, and silver anomaly we mapped during previous campaigns. Our strategy at Rockley has always been to determine whether the high-grade copper and gold we see at the surface reflects a larger system at depth.”
The survey covered five lines using a pole-dipole array, with receiver arrays totalling 7,800m. The company used two- and three-dimensional inversion modelling to define the three zones.
Rockley sits within the Ordovician Macquarie Arc, which hosts the Cadia Valley, North Parkes, and Cowal copper-gold deposits. It is less than 15km from the Bushranger deposit, where drilling intersected 920m at 0.3% copper from 110m, including 156m at 0.48% copper.
Kenex and the Geological Survey of NSW assessed Rockley as “one of the most prospective areas” for porphyry-related copper-gold mineralisation within the Rockley-Gulgong Volcanics.
The company is integrating the inversion models with geological mapping, structural interpretation, and geochemistry to prioritise the three targets. Drill testing remains subject to planning, landholder access, approvals, and funding.
Legacy Minerals is an Australian explorer advancing a portfolio of precious and base metal assets.
Write to JC Villarba at Mining.com.au
Images: Legacy Minerals
