9Gurtunca R G, Keynote L. Mining below 3 000 m and challenges for the South African gold mining industry[A]. In: Proceedings of Mechanics of Jointed and Fractured Rock[C]. Rotterdam: A. A.Balkema, 1998. 3 - 10.
10Diering D H. Tunnels under pressure in an ultra-deep Wifwatersrand gold mine[J]. Journal of the South African Institute of Mining and Metallurgy, 2000, 100: 319-324.