First coal shipped to Hartlepool. Pit owned by Thornley Coal Co Ltd
1842
Primitive and Wesleyan Chapels built – cost �200
1841
Population 1076
1843
Railway was extended to Cassop Vale and then to Cassop Moor Collieries
1850
The Crowtrees Incline fell into disuse
1850
Mid 1850 Cassop Moor Pit closed
1851
Population 1769
1854
Collieries sold to R P Philipson a Newcastle Solicitor and local landowner
1856
Boring at Vale Pit to prove Hutton and Harvey Seams
1861
Population 1661
1868
St Paul’s Church built
1890
Royalties for remaining coal acquired by Walter Scott of East Hetton Pit for Cassop Colliery
1897
Cassop Colliery may have opened again, when on 10th May, water flooded into East Hetton Colliery trapping the miners underground, at least 10 men lost their lives, but John Wilson a deputy was rescued alive after 4 days underground.
1891
Population 691
1893
Railway lines to Thornley taken up
1901
Population 653
1923
First bus service
1930
Wesleyan Chapel closed - wooden building
1937
Stable Row (owned by Coal Company) vacated. First council houses built.
2 Bedroom – 6s8d per week
1940
15th Aug bombing raid on Cassop, Joe Pluck killed returning from work
(Thornley Colliery)