Why have manganese deposits at Tambao been difficult to exploit?

The manganese deposits at Tambao, located in northeastern Burkina Faso, are considered among the richest in the world. However, their exploitation has been significantly limited by existing transport inadequacies.1

It is important to note that Tambao is distinct from Tambacounda, a town in southeastern Senegal, and the two should not be confused. The development of resources in Burkina Faso is further challenged by the country's lack of a direct outlet to the sea and a relatively small market economy.2