| Description | Columns for names of collieries, standard tonnage (total given as 2894702, reduced from 1 March 1932 to 2819797), number of shafts, diameter in feet, whether winding, seams worked, how worked (all Longwall), section, depth to seam in yards, number of decks, tubs per deck, simultaneous or ordinary decking, draws per hour, average weight per tub, present daily output, numbers of men employed (at coal face, underground and all employed), outputs per man (for coal face, underground and all employed), average wages per shift (surface, all underground, all employed), number of cutters, number of conveyors, areas worked during 1931 (acres, roods, perches), tons per acre, screens (capacity tonnage per 7 hours), average percentage of slack in output (maximum size and percentage), and annual outputs, days worked and average daily output for each year between 1923 and 1931 |