Research Article
Analysis and Engineering Practice of Factors Affecting Top-Coal Recovery in a Large Dip Coal Seam
Table 1
Roof and floor of the working face.
| Roof and floor | Lithology | Thickness (m) |
| Main roof | Sandy mudstone | 6–9 | Immediate roof | Limestone | 5–7 | Immediate floor | Mudstone | 1-2 | Main floor | Fine sandstone | 1–3 |
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