RE:RE:RE:RE:RE:RE:RE:The revise 43-101 late march 2023 will beat Grasberg in Gold
Copper and Zinc sulfide ores are most often roasted. The sulfide comes off as SO2 which can be sold or made into sulfuric acid - also a saleable product. The other way of treating them is pressure leaching and the sulfur comes off as elemental sulfur in that process. Yes it is a huge expense and unlikely to be an option unless there was an agreement to process material from other mines in the area. A similar process to marigold would be pretty sweet though. Our grades are higher and we don't have the arsenopyrite that they have to deal with...