Khanyisa Mayo, the son of ex-Bafana Bafana forward Patrick Mayo, netted with a fine strike in the 26th minute at the Stade Général Seyni Kountché.
The tournament decider is scheduled for Sunday, with Mali and Guinea contesting the other last-four tie on Thursday.
By reaching the semi-finals, all four countries qualified for the Fifa U17 World Cup, taking place in Chile from October 17 to November 8.
Ed. Congrats to coach Molefi Ntseki, the boys and technical team. We’re proud of your efforts and carrying the country’s flag high.
The minister of Sport Fikile Mbalula will send his congratulatory message from Parliament- Cape Town, later today, as part of his departmental budget speech.