Can you help?
This is Redcar iron works. Cast iron, not required at the Lackenby steel plant, is being poured into sand pits, known as ponding so that the torpedo ladles can be refilled with fresh iron. (This information was kindly provided by Jim Gribbin) 
Picture Stockton Archive
A Pictorial History of Stockton-on-Tees
Unless Lackenby were still using open hearth furnaces this would have been a real waste. Oxygen converters require ‘hot liquid metal’ that is molten, partially refined pig iron. The metal dumped by the torpedo ladles would have gone solid. It would then have to be cut up by burning with oxygen lancers and then some how remelted. I suppose a bit at a time could have been charged to the oxygen convertors if that it was was being used at the time of this picture. (The open hearth plant at Lackenby, commissioned in 1952, I think, was one of the last of these installations to be built in Britain).