Antipa Minerals Ltd (ASX:AZY) has confirmed ore from its North Telfer Project in Western Australia can be processed to produce both copper-gold concentrate as well as cobalt-gold products.
The metallurgical test work demonstrated the ore could produce a copper-gold concentrate of up to 21.9% copper in intermediate flotation concentrate with high gold grades up to 67 g/t.
Antipa also produced standalone cobalt products in the test work, using both gravity and flotation methods to produce concentrate.
The cobalt gravity concentrate graded up to 11% cobalt with recoveries up to 66% and the flotation concentrate graded up to 5.6% cobalt with recoveries up to 68%, both with gold by-product.
All metallurgical test work to date has been conducted by Bureau Veritas Minerals Pty Ltd under the management of Strategic Metallurgy Pty Ltd.
The test work aimed to confirm the potential of ore from the Minyari Dome deposit to be processed through two potential routes: a conventional gold circuit to recover gold only or a conventional flotation to create discrete copper-gold and cobalt-gold products.
This follows on from testing in 2017 that focused on gold only, with conventional gravity and cyanide leach processing delivering recoveries of 95% in oxide ore and 88% in primary ore.
Antipa believes unlocking the copper and cobalt by-product value can further enhance the project’s development, particularly now that it is demonstrably amenable to conventional processing techniques.
Upcoming test work will focus on:
Copper and cobalt flotation optimisation to improve concentrate grades at suitable recoveries;
Optimisation of gravity concentration of cobalt;
Oxide by-product flotation test work;
Grind optimisation; and
Evaluation of heap leach amenability.