Gold can become invisible when bound with other minerals due to an atomic-scale attraction with arsenic. Researchers used intense X-rays to study this phenomenon. When arsenic is present, gold forms strong bonds with it, stabilizing in the mineral structure. This process explains how iron sulfides capture and release gold, affecting ore deposit formation. The discovery may lead to easier gold extraction and improved processing methods. However, the association of gold with arsenic poses health risks to miners. Understanding this atomic-level attraction can help prevent these associations. Overall, the study sheds light on why gold is often found with arsenic-rich minerals.
https://www.mining.com/why-gold-loves-arsenic/