| Answer | Crossword Clue |
|---|---|
| SEAM | Bed of coal or other valuable mineral. |
| seam | bed of valuable mineral and especially coal irrespective of thickness |
| seams | bed of valuable mineral and especially coal irrespective of thickness |
| opencast | noting or pertaining to a type of surface mining in which coal and other flat-lying mineral deposits are removed by the excavation of long, narrow trenches |
