PTBA Internship Report · internship-4-u32
Roof of Seam A1
Seam A1 is correlated in RTB 11, RTS 74 and RTS 06 at approximately 29–37 m, 14–24 m and 87–96 m respectively. The source describes a variable 3–10 m seam with clay bands or partings about 2–8 cm thick beneath a mudstone–shale roof.
SOURCE-LED TECHNICAL READING
Geological interpretation and evidential boundary
Seam A1 is correlated in RTB 11, RTS 74 and RTS 06 at approximately 29–37 m, 14–24 m and 87–96 m respectively. The source describes a variable 3–10 m seam with clay bands or partings about 2–8 cm thick beneath a mudstone–shale roof. Because this frame is centred on the coal interval, it documents internal banding and parting distribution; the roof contact is constrained by the adjoining panel rather than inferred from this crop alone. In the internship report, the core photograph establishes recovered lithology and vertical order; it cannot measure continuity between boreholes. Brightness, dull bands and visible clay partings are valid core-scale descriptions, while peat composition, rank and saleable quality require the linked laboratory results. The three boreholes correlation becomes persuasive where core boundaries and depth-matched gamma–density markers reproduce the same roof–seam–floor succession; incomplete recovery, broken core and depth offsets remain competing explanations for an apparent thickness change. Where the same panel appears in the later thesis, it preserves the source history rather than adding a second independent observation.
- Source
- Private internship source vault · Chapter IV record
- Location in source
- 4.4.6 Seam A1
- Image quality
- Source scan
- Record ID
- internship-4-u32
