I am sending my hon. Friend a list showing the number of wage earners now on the books of each of the 17 coalmines in the county of Durham which have started operations during the last 25 years. During the same period operations ceased at 41 mines in the county. At each of these mines 100 or more wage earners were employed in 1921. At that date the total number of wage earners so employed was 18,798.