Along with the
Dognecea area, Ocna de Fier is among the few settlements in the world that supported almost continuous
mining for some 4000 years. Archaeological evidence shows that mining in the area dates back to the
Bronze Age (1900–1700 BC). The main ore exploited in those times was native
copper from the oxidation zone of the deposit. Later on,
iron ores brought about a gradual switch from copper to iron mining. Mining was an activity of the
Dacians, the ancient inhabitants of present-day Romania. After the
Roman conquest in 106, mining was expanded in the Roman province of
Dacia. At
Berzovis (present day Berzovia, ten kilometres northwest of Ocna de Fier) a Roman
metallurgy school, Schola fabrorum, was established, showing the keen interest the Romans had in metal extraction. At Cracul cu Aur (Romanian for "Golden Tributary"), north of Ocna de Fier, old Roman
gold mining galleries can still be seen. They look like the much better preserved ones at Rosia Montana ("Verespatak"), in the Apuseni Mountains. The Constantin Gruescu Iron Aesthetic Mineralogy Museum is located in Ocna de Fier. ==References==