The Germans had specialists who came in to try to get the Maikop oil fields back into production. The Soviets had done a thorough job, so their efforts did not yield much before they lost the area.
Otherwise, depended on the war. In WWs I and II, Germans could keep mines and factories etc running in the occupied west with the existing labour force and management under German supervision. EG the Phillips works at Eindhoven kept producing vacuum tubes for radar and radio. In the east, the Germans found it easier to take people back to Germany and put them to work in German factories, as Soviet relocation and destruction left little plant. They did run some stuff – like the hydro plants on the Dnieper and the mines at Nikopol.
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