WASET
    Thembelihle Nkonyane and  Freeman Ntuli and  Edison Muzenda,  Treatment of Acid Mine Drainage Using Un- Activated Bentonite and Limestone.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2012, vol. 68(8). 667 - 672
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/8043.