How did the kingdom of Takedda become important in long-distance trade?

The Tuareg-controlled kingdom of Takedda, located west of the Aïr Massif, rose to prominence in long-distance trade during the 14th century primarily due to its valuable copper mines.12

At that time, copper served as a vital form of currency throughout western Africa, making the kingdom a significant economic hub. Archaeological findings indicate that the region—which is now desert—supported communities of agriculturalists, likely Songhai-speaking, during the kingdom's existence. Takedda was eventually succeeded by the sultanate of Agadez.12