Why are gold and silver often recovered together from the same ore?

Gold and silver are frequently recovered together because they often occur naturally in the same geological deposits and mineral structures. Native gold, for instance, almost always contains a small percentage of silver, and electrum—a naturally occurring alloy—contains significant amounts of both metals. Furthermore, both metals are commonly found in vein deposits formed by hydrothermal solutions, where they may be disseminated within the same ore bodies.12

Beyond their geological association, these metals are often recovered together as by-products during the processing of other base metals, such as lead, zinc, or copper. Once extracted, the resulting mixture—known as bullion or doré—is processed through parting, a metallurgical technique used to separate the two metals using chemical or electrochemical methods.3