Table 4 Key parameters and their values determining the maximum open pit mining depth of the Sijiaying iron mine.
From: Investigation on the transition depth of open pit to underground mining in Sijiaying iron mine
Parameter | Value | Unit |
|---|---|---|
Ore density | 3.16 | t∙m−3 |
Average dip angle of the hanging wall | 40.00 | (°) |
Average dip angle of the footwall | 44.78 | (°) |
Average orebody thickness | 74.00 | m |
Maximum allowable slope angle on the hanging wall | 43.00 | (°) |
Maximum allowable slope angle on the footwall | 38.00 | (°) |
Open pit mining cost | 16.80 | ¥∙t−1 |
Open pit stripping cost | 30.20 | ¥∙t−1 |
Underground mining cost | 108.96 | ¥∙t−1 |
Final economic depth | 407.00 | m |
Final technical depth | 388.00 | m |
