Gold’s chemical properties are very stable.So accidentally there is a big gold nugget in nature.But for most ores, the gold content is not high enough.So we need to enrich gold.
The main way to enrich is to generate stable Au(III) coordination complex.The current industrialization method is to use cyanide ions.(CN-) There are also methods of using thiourea.(NH2CSNH2)
Then replace the gold with a lively metal such as zinc.
But in minecraft, the usages of gold is not as many as its usages in real life.Besides,other mods,like TE,have many simpler and cheaper gold ore processing methods.