Iron ore. The Mua mine is a large iron mine loed in central Portugal in the Bragança District. Mua represents one of the largest iron ore reserves in Portugal and in the world having estimated reserves of billion tonnes of ore grading 37% iron metal.
· From Hearts of Iron 4 Wiki. Jump to navigation Jump to search. This is a community maintained wiki. If you spot a mistake then you are welcome to fix it. Available only with the La Résistance DLC enabled. Portugal gets a unique national focus tree with the La Résistance expansion. Without the expansion, it utilizes the Generic national focus tree instead. .