Broken Hill Mines (ASX:BHM) has intersected a 40m-wide mineralised zone during the first targeted drilling below the Globe-Vauxhall Shear at its Rasp Mine in New South Wales.
Hole WMDD6391 returned 25.8m @ 11.7% zinc equivalent (ZnEq) and 323 grams per tonne silver equivalent (AgEq) from 415.1m, comprising 39g/t Ag, 2.3% lead (Pb), 7.9% Zn, 0.2% copper (Cu), and 0.1g/t gold (Au).
The result includes 10.9m @ 17.3% ZnEq and 479g/t AgEq from 422m, comprising 58g/t Ag, 4.1% Pb, 11.5% Zn, 0.1% Cu, and 0.1g/t Au.
All reported intersections are downhole lengths, with true widths unknown.
Broken Hill Mines says the 25.8m intercept is approximately 500% wider and 27% ‘higher grade’ at that location than modelled in the Centenary zone’s 2024 inferred mineral resource estimate.
Centenary hosts 4.8 million tonnes @ 9.2% ZnEq and 255g/t AgEq, comprising 39g/t Ag, 2.4% Pb, and 6% Zn.
The company says initial mineralogical work identified hedenbergite and tetrahedrite in the drill core, indicating differences between Centenary and the adjacent Western Mineralisation. It interprets the mineralisation as more closely resembling the Rasp Mine’s historic Main Lode.
The drilling used a large-diameter hole through the Globe-Vauxhall Shear, which was cased to allow smaller daughter holes to be drilled into Centenary. Previous drilling encountered deflection through the shear, with only 24 holes completed at Centenary before the current program, mostly from surface during the 1980s.
Centenary extends across an interpreted strike length of approximately 1,600m and a vertical plunge of more than 280m. Mineralisation remains open along strike and at depth.
The zone lies approximately 200–300m from existing Western Mineralisation operations and associated declines, ventilation, and haulage infrastructure.
Broken Hill Mines says it is reinterpreting historical drilling and undertaking further drilling to define an exploration target ahead of a planned Rasp mineral resource update in the December quarter of 2026.
Write to France Pinzon at Mining.com.au
Images: Broken Silver Mines
