Most of the mining took place in two different areas:The northern pit, located in Sankt Georgen (a district of Freiburg) and a southern pit in the Ebringen district, from which smaller amount of ore was extracted. Ore from the southern pit was transported via cableway to the loading station in Sankt Georgen. 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. This method made the supply of calcareous ore from the Schönberg unnecessary.