THE TOP FIVE

1. Aliko Dangote

NET WORTH: $12.1 billion 

COUNTRY: NIGERIA

SOURCE OF WEALTH: CEMENT

2. Nassef Sawiris

$8.5 billion 

EGYPT

CONSTRUCTION, INVESTMENTS

3. Nicky Oppenheimer

$8 billion 

SOUTH AFRICA DIAMONDS

4. Johann Rupert

$7.2 billion 

SOUTH AFRICA LUXURY GOODS

5. Mike Adenuga

$6.3 billion 

NIGERIA TELECOM, OIL