Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,405 pages of information and 233,863 images on early companies, their products and the people who designed and built them.
1896 There were 686 men working this pit. 
1908 The work force had grown to 1272 men. 
1918 There were now 1355 men reported to be working at the Castle Pit. 
See Welsh Mining website for more details and images.