PTBA Internship Report · internship-4-u29
Seam A2, Seam A1 and A1–A2 interburden
This composite panel places Seams A2 and A1 beside the A1–A2 interburden and the partings that interrupt the coal.
SOURCE-LED TECHNICAL READING
Geological interpretation and evidential boundary
This composite panel places Seams A2 and A1 beside the A1–A2 interburden and the partings that interrupt the coal. The comparison matters because a seam envelope is not the same as clean-coal thickness: A2 contains source-reported clay bands or partings about 2–15 cm, while A1 contains bands or partings about 2–8 cm, and the intervening package is fine, locally tuffaceous sandstone. The panel supports vertical ordering and practical marker recognition; the repeated material in the later thesis is provenance continuity rather than independent replication.
- Source
- Private internship source vault · Chapter IV record
- Location in source
- 4.4.5 Seam A2
- Image quality
- Source scan
- Record ID
- internship-4-u29
