 In addition, a smaller mining field existed close to Bollschweiler (Kuckucksbad).Here, mining was shut down in 1939 however, because the iron ore contained only 20-30 % of iron and was therefore not worth mining.In 1942 mining was already ceased, because, in addition to the low iron content, the course of war led to an increased availability of iron ore from France (Lorraine) and Sweden.The main reason for the cessation, however, might have been caused by the intensified use of the (a method used in steel production) for the metallurgy of acid iron ore.