Kelly’s drilling15 Oct 2022 14:39
I would have thought there would be a lot of excitement here about drilling around and under the old Kelly’s copper mine.
Fantastic grades have been mined from here in only a small section of stope.
A description of the geology and mine from Mindat
“A porphyry copper deposit located approximately 50 kms north-west of Nullagine. Sporadic north north-west trending mineralisation along a length of 600 metres, developed in quartz veins along shears cutting feldspar porphyry. Primary mineralisation is pyrite and chalcopyrite in quartz veinlets, or disseminated in host chlorite and sericite altered quartz feldspar porphyry.
The porphyry is highly fractured, and brecciated, containing mafic fragments, in contact with the Boobina porphyry. The stope present is in a shear zone, with quartz veins, Cu staining limonite veins and lenses several centimetres thick. The oxidised zone contains malachite, azurite, cuprite, chrysocolla, with further bornite and chalcocite in the supergene zone, with the primary zone containing pyrite, and chalcopyrite in quartz, sericite and chlorite.
Production between 1955 to 1970 of 609.69 tonnes of cupreous ore averaging 19.47% Cu by various parties. When inspected in the mid 1970's there was a collapsed stope, 1-3 metres wide, and 25 metres long, as well as a shaft down to 18.5 metres at the southern end, and another shaft at the northern end.”
https://www.mindat.org/loc-122951.html
That’s an average of 19.47% , that’s a really high grade.
Bornite normally contains around 65% of copper
While Chalcopyrites contain about 35%
The average high grade suggests Bornite but the mentioning of a supergene also suggests concentration of minerals in a layer due to being weathered downwards as at Winu
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