Echo Energy plc announced preliminary results of metallurgical testing of gold samples from mining shafts at the Tesoro Gold Concession (Tesoro), southern Peru, which is held by the Company's 50%-owned Peruvian joint venture, Boku Resources SAC (Boku). Following Echo's announcement on 1 July 2024 regarding its participation, through Boku, in gold and silver mining and the cleaning of known tailings deposits containing gold and silver in Peru, Boku has undertaken metallurgical tests of samples obtained from Tesoro. The samples were processed at the Minares South laboratories in Chala, Arequipa, southern Peru.

The preliminary results come from two composite samples taken from two main shafts corresponding to the "Bonanza" and "La Dorada" vein systems at a depth of approximately 10m. to determine the gold dissolution susceptibility through standard bottle roll cyanidation tests. The achieved results show that after a retention time of 48 hours, a maximum dissolution of over 90% was evidenced, with recovery rates of 90.53% (sample 000234) and 92.93% (sample 000240).

Tesoro is situated in the Nazca-Ocona gold corridor in the province of Caraveli, department of Arequipa, southern Per Peru.