Dorothea
Opened 1816 closed 1956
Working the five quarter seam at the depth of 98 fathoms, the coal is eight feet and six inches thick the output is 700 tons daily, employing 660 men and boys in 1894
Wednesday 30th August 1895
All the pitmen and boys both underground and bank, with the exception of the brakemen, have got their notices. The pit is to be stopped for alterations to the shaft, bigger cages, and making a dis-appropriate from the 5/4 seam to the maudlin on Saturday.
Saturday 19th January 1895
175 men and boys got their notices, because of alterations to the engine plane.
June 27th 1896
The Earl of Durham's collieries changed hands.
December 8th 1918
William Kirtley Aged 55 years died in the Sunderland Royal Infirmary
Cause of death: shock from extensive scalds to body and limbs through the accidental bursting of a steam pipe while he was at work on 6th December 1918 at Dorothea Pit, Philadelphia