Research Article
Determination of the Ultimate Underground Mining Depth considering the Effect of Granular Rock and the Range of Surface Caving
Table 1
The stages of excavation and filling.
| Mining stage | Excavation number | Filling number | Mining level (m) |
| First stage | 1, 2, 3, 4, 5, 6, 7, 8 | 1, 2, 3, 4, 5, 6, 7, 8 | Surface to 190 | Second stage | 9, 10 | 9, 10 | 190 to 150 | Third stage | 11 | 11 | 150 to 130 | Fourth stage | 12 | 12 | 130 to 110 | Fifth stage | 13 | 13 | 110 to 90 | Sixth stage | 14 | 14 | 90 to 70 | Seventh stage | 15 | 15 | 70 to 50 |
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