| Chainage | RMR System | Q System | |||
| Rock class | Estimated Support | Rock class | Estimated Support | ||
| Shotcrete (mm) | Bolts | ||||
| 0+876 - 1+000 | Fair | Systematic bolts of 4 m long, spaced 1.5 - 2 m in crown and walls with wire mesh in crown and shotcrete of 50 - 100 mm in crown and 30 mm in walls | Fair rock | No | Systematic bolting, with 2 m length and 1.8 m spacing |
| 1+000 - 2+800 | Poor rock | 40 - 100 | Systematic bolting, with 2 m length and 2 m spacing | ||
| 2+800 - 4+000 | |||||
| 4+000 - 5+600 | No | Systematic bolting, with 2 m length and 1.5 m spacing | |||
| 5+600 - 6+600 | 40 - 100 | Systematic bolting, with 2 m length and 2 m spacing | |||
| 6+600 - 7+000 | No | Systematic bolting, with 2 m length and 1.6 m spacing | |||
| 7+000 - 7+200 | Poor | Systematic bolts of 4 - 5 m long, spaced 1 - 1.5 m in crown and walls with wire mesh, shotcrete: 100 - 150 mm in crown and 100mm in walls with steel sets of Light to medium ribs spaced 1.5 m where required | Very poor rock | Fiber reinforced (50 - 90 mm) | Systematic bolting, with 2 m length and 1.5 m spacing |
| 7+200 - 7+506 | |||||