During my research for my bachelors thesis into the classification of mining in the Reichsgruppe under the Nazi regime, I came across two different classifications:
So which is correct?
I can only explain this apparent double classification by the central importance of mining for both economic sectors: On the one hand as a supplier of raw materials for industrial production and on the other as a key sector for energy supply.
Is it possible that in different sources and at different times the emphasis was placed more on one or the other affiliation, depending on which aspect of coal mining was in the foreground, so that it can be said that mining belonged to both groups?