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1947 - 1977 production levels and output per manshift
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1940s
- Deep Hard seam reopened and power loading introduced
- Production from Top Hard, Dunsil and 1st Waterloo seams
1950s
- North shaft extended to 2nd Waterloo level
- Cessation of production in Top Hard seam
- Production expands from Dunsil, 1st Waterloo and Deep Hard
1960s
- Development of Piper seam
- Cessation of production in Dunsil seam
- Development of 2nd Waterloo seam begins
- Cessation of production in north-side Deep Hard seam
- Cessation of production in 2nd Waterloo seam
1970s
- Cessation of production in 1st Waterloo seam
- Cessation of coal winding at North pit
- Development of south-side Deep Hard seam
- Cessation of production in Piper seam
- Development of combined Deep Hard / Piper seam
1980s
- Production expands from combined Deep Hard / Piper seam
- Cessation of coal winding at South pit
- Cessation of man winding at South pit
- Closure of colliery
- Demolition of most of surface infrastructure and buildings
- Emergency listing of headstocks and engine-houses.
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