Plan entitled Surface plan no. 4, scale 40 feet to 1 inch. Shows Main Colliery no. 1 Pit, surface buildings, with surrounding houses, railway lines, and buildings marked as Wernddu.

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Records relating to Main Colliery, BryncochD/D Z 856

Five rolls of plans of installations, building and structures for a proposed new power station at Main Colliery no. 1 Pit.D/D Z 856/1-5

Plans of other pieces of equipment at Main Colliery no. 1 Pit, including boiler, cooling tower pipework, the location of a fatal accident (name of deceased not given), and transformer house.D/D Z 856/6

Plan entitled Surface plan no. 4, scale 40 feet to 1 inch. Shows Main Colliery no. 1 Pit, surface buildings, with surrounding houses, railway lines, and buildings marked as Wernddu.D/D Z 856/7

Plan entitled Main Collieries: plan shewing mineral properties, Greenway Seam. Shows details of lettings of mineral rights, scale 6 inches: 1 mile.D/D Z 856/8