| |||
| open cast mining; opencast mining; strip mining; surface mining | |||
|
exploitation par couches : 2 phrases in 2 subjects |
| Coal | 1 |
| Environment | 1 |
| |||
| open cast mining; opencast mining; strip mining; surface mining | |||
|
exploitation par couches : 2 phrases in 2 subjects |
| Coal | 1 |
| Environment | 1 |