The situation improved with the invention of cupellation, a way that allowed silver metal being extracted from its ores. Even though slag heaps present in Asia Minimal and over the islands in the Aegean Sea indicate that silver was becoming separated from lead as early as the 4th millennium BC,[14] https://gold-ira29494.smblogsites.com/37684335/the-definitive-guide-to-top-rated-gold-ira-companies