FROM SOURCE:

Diyarbakir has a complex relationship with "bakir", meaning copper. When after the foundation of the Republic, the name Diyarbakir [lit. "land of copper"] was given to the city, its former name Diyarbekir was treated as a mistake that had remained in use for centuries, and the preference was made to return to the "original" and call the province "the land of copper". Although the city is by no means poor in terms of mining, it is debatable whether it is copper-rich enough to name the city after
it.
On the other hand, findings from human settlements that date as far back as the Neolithic Period reveal that the region did indeed play a pioneering role in copperworking. It could be said that this role played by the region nurtured an economic and cultural streak that spreads across millennia. Along with gold and silver, coppersmithing, too, became a significant production activity for the city, and a craft that shone especially in the hands of non-Muslim peoples. We will take the story of copper in Diyarbakir from those single beads [discovered in excavations] that have reached the present day to how it today has become confined to the souvenir industry.