APMEX carries Gold and Silver coins from Bulgaria. Human activity in the lands of modern Bulgaria can be traced back to the Paleolithic era. The eneolithic Varna culture (fifth millennium B.C.) is credited with inventing Gold working and exploitation. Some of these first Gold smelters produced the coins, weapons and jewelry of the Varna Necropolis treasure, the oldest in the world with an approximate age of over 6,000 years.