This question is popular, hence, the candidates performed fairly. The question requested the candidates to give the following points:
Problems of water in mining operations

1. Water pressure reduces the stability of the slope in open pits.
2. Induces sliding of materials in the slope in open pits.
3. Increased weight of the unit rock thus higher rates for transportation.
4. Freezing water can block drainage paths
5. Erosion can cause instability and silting up of drainage systems
6. Increased operating costs from discharge of water for equipment and blasting costs.
7. Disrupts operations
8. Reduces productivity
9. Causes inefficient blasting operations
10. Reduces slope stability in open pits.