| |||
| benching; stepped excavation | |||
| bench stoping; stoping | |||
|
exploitation par gradins : 15 phrases in 3 subjects |
| Coal | 11 |
| General | 1 |
| Metallurgy | 3 |
| |||
| benching; stepped excavation | |||
| bench stoping; stoping | |||
|
exploitation par gradins : 15 phrases in 3 subjects |
| Coal | 11 |
| General | 1 |
| Metallurgy | 3 |