 |
| |||
| R = thickness of overburden/thickness of useful coal; overburden ratio; stripping ratio | |||
| |||
| coverage ratios | |||
| rapporto di copertura: 1 phrase in 1 subject |
| Finances | 1 |
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
| Get short URL | Language Selection Tips