Joubert, J.S.C., L.A. Freeman, P.J. Terbrugge, and J. Venter. “The Koidu Vertical Pit – Sierra Leone”. International Kimberlite Conference: Extended Abstracts 9 (October 15, 2008). Accessed April 18, 2024. https://ikcabstracts.com/index.php/ikc/article/view/3625.