Mining Journal Article part 14 Mar 2021 14:24
The company started drilling in mid-December and after a short break for Christmas, Xtract announced on January 12 that "significant copper mineralisation" had been intersected in the first hole from a depth of 110m to 607m.
The copper mineralisation is predominantly disseminated chalcopyrite (copper sulphides) within a strongly altered quartz-feldspar porphyry intrusive body.
About a week later, Xtract announced the hole had been completed to a depth of 1050m, 235m past the original planned depth, and was continuously mineralised.
Xtract said the core exhibited vein-hosted and disseminated chalcopyrite, pyrrhotite and pyrite mineralisation, and locally quartz-chalcopyrite-pyrrhotite veins, occurring within a volcanic rock package equivalent to that hosting Newcrest Mining's Cadia deposits, which sit about 80km to the northwest of Bushranger.
Preliminary XRF handheld assays for the first hole returned 287m at 0.3% copper from 474m, using a 0.2% copper cut-off, including 30m at 0.4% copper, 23m at 0.5% copper and 39m at 0.5% copper from, using a 0.3% copper cut-off.
The second hole was completed in early February to 899.4m, about 150m deeper than planned due to the presence of visible mineralisation.
The third and planned final hole of the planned program was completed at 975.5m, having drilled through the altered and mineralised porphyry system from 240m to the base of hole.
Chalcopyrite copper mineralisation was first observed at 119m and became more persistent from 240m, with the best mineralised interval coinciding with the central alteration zone over a 227m length from 598m to 825m.
A fourth hole was collared from the same pad as drill three, but following further review of the orientation, it was concluded that the down-plunge continuation of the deposit would be more effectively tested from a new site and was suspended at 117.6m.
Hole five, 120m down-plunge of hole three, started over the weekend and at 126.7m depth, had entered the outer alteration halo of the deposit earlier than expected at 45m, with pyrite/pyrrhotite mineralisation and traces of chalcopyrite.