Abstract Thiosulfate has shown promise as an alternative to cyanide for gold leaching. However, one of the limitations is high thiosulfate consumption. Thiosulfate degradation is not completely understood. Of the degradation products, trithionate is a concern in the resin recovery of gold and is persistent in solution. Very little is known about the expected behaviour of trithionate both with respect to its formation and to its interaction with other solution species.The focus of this work was to further the understanding of the behaviour of trithionate in gold leach solutions. − d [ S 3 O 6 2 − ] d<...