In addition to asserting his authority over this region, the temples were also used for the storage of gold and other precious cargos carried by caravan from central Africa.
The temple was never used as a storage space for gold. 
mnli hypothesis: The temple was never used as a storage space for gold.  premise: In addition to asserting his authority over this region, the temples were also used for the storage of gold and other precious cargos carried by caravan from central Africa.