Australian Gold and Copper (ASX:AGC) said that flotation and leaching test work on a bulk composite sample from the Achilles deposit at the South Cobar project in New South Wales demonstrated robust recoveries of all metals to a silver-gold-lead zinc concentrate, according to a Thursday Australian bourse filing.

The composite sample underwent sulfide rougher and cleaner flotation trials with leaching of the resultant tails, with combined float/leach recoveries of 83% for silver and over 90% for gold, with concentrate grades of up to 1,267 grams per tonne (g/t) and 4.9 g/t, respectively. It also showed recoveries of more than 92% for lead and about 96% for zinc, with concentrate grades of up to nearly 19% and roughly 33%, respectively.

Combined sequential and leach test work produced a high-grade silver-gold-lead concentrate grading 2,276 g/t of silver, 9.2 g/t of gold, and 41% of lead, with recoveries of up to about 76%, nearly 80%, and over 92%, respectively. A high-grade zinc concentrate grading almost 60% zinc with a recovery of about 70% zinc was also produced.

Future test work is expected to focus on selectivity and recoveries to each of the respective concentrates, per the filing.

The company's shares jumped almost 6% in recent trading on Thursday.