The iron complex of Moncorvo belongs to the Armorican Quartzite Formation, from the Ordovician period and the iron layers alternate schists, psammites or quartzites. Its main minerals with iron grade are: specular hematite, granular hematite, lobular hematite, martite, magnetite and goethite.
The ores extracted in the Moncorvo Iron Mines have exceptional characteristics and enormous potential for commercial feasibility.