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Antipa Minerals has metallurgical success at Calibre copper-gold deposit, Western Australia

Published: 12:00 28 May 2014 AEST

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Antipa Minerals (ASX:AZY) has received positive results from metallurgical test work from the 873,000 ounce gold and 81,000 tonne copper Inferred Mineral Resource region of its Calibre deposit in Western Australia.

Total copper, gold and silver extraction of 85.7%, 80.5% and 81.3% respectively was achieved via a combination of conventional sulphide flotation and cyanide leaching of the flotation tails.

A copper sulphide concentrate was produced using conventional sulphide flotation which graded approximately 24% copper, with significant gold and silver credits.

Cyanidation of the copper flotation tails recovered a substantial portion of the gold not reporting to the copper concentrate.

Preliminary mineralogy of the ore used in this test work program, by QEMSCAN®, revealed both the copper and tungsten minerals to be comparatively coarse grained and well liberated.

Heavy Liquid Separation test work was used to assess the amenability of the ore to physical upgrade processes such as gravity, and highlighted the density beneficiation qualities of Calibre mineralisation.

The Calibre deposit’s simple and coarse grained copper mineralogy is almost exclusively chalcopyrite - no copper oxide or other copper sulphide minerals were observed.

The straightforward mineralogy has produced very favourable metallurgical outcomes from the low copper ore grades of Calibre.

Future test work will focus on improving the copper concentrate grade, developing a better understanding of the gold and silver mineralisation, and assessing methods of recovering the tungsten values in a marketable form.

Calibre ore has demonstrated its amenability to conventional, proven, low cost processing techniques, which will have a material positive impact on project economics.

Antipa recently commenced copper-gold drilling, designed to target the untested region of the Calibre ground magnetic anomaly.

 

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