 |
| |||
| back-fill stoping; cut and fill stoping; cut-and-fill method | |||
|
exploitation par remblayage : 5 do fraz, 1 tematyki |
| Hutnictwo | 5 |
|
| |||
| back-fill stoping; cut and fill stoping; cut-and-fill method | |||
|
exploitation par remblayage : 5 do fraz, 1 tematyki |
| Hutnictwo | 5 |