<Tr> <Th_colspan="2"> Government </Th> </Tr> <Tr> <Th> Mayor </Th> <Td> Hallé Ousmane </Td> </Tr> <Tr> <Th> Elevation </Th> <Td> 261 m (856 ft) </Td> </Tr> <Tr> <Th_colspan="2"> Population (2009) </Th> </Tr>

Which mineral made the kingdom of mali rich