 This study aimed to optimize the conditions for bioleaching gold and silver from electronic waste using the bacterium cruzio bacterium violacin. The results indicated that the highest recovery rate was achieved with an oxygen concentration of 0.56 milligrams per litre, a pulp density of 1.95%, and a glycine concentration of 2.49 milligrams per litre. These conditions were found to be optimal for maximizing the recovery of both gold and silver. This article was authored by W.A.N.Fraslina Abdul-Yani, Fatiha Sajja, Sharif Al-Zirina, Saeed Jamaluddin, and others.