Gold Processing and What Gold Mines Produce
Once the ore has been extracted, further processing is needed to separate the gold, and any other high-value minerals, from the rock itself. There are a number of methods to do this – such as milling and smelting – and the method used will depend on the grade and type of ore involved.
After the processing stage, any metal recovered will be formed into unrefined bars known as “doré”. These unrefined bars will not only contain gold, but other metals – such as silver or copper – which have been extracted. And the proportions of each metal can vary between bars, although gold will generally account for 60-90% of the bar. These will then be sent to a refinery to separate each pure metal.