Trade was a big part of the economy of Post-Classical Africa. For example, the city of Mali would not have gotten as large as it did if it weren't for the gold trade. Other goods traded were ivory and slaves.
The Saltworks At The Oasis Of Taghaza
Ibn Battuta arrives in Taghaza. He described the city as run-down and unattractive.
In Taghaza, slaves would mine salt and they would use camels to transport the salt.
The slaves would trade the salt in exchange for other things they needed.
Ibn Battuta said that the water in the city was dirty and not good to drink.
After a rain storm, puddles of water formed that were safe to drink out of.