The research of the UPV / EHU raises to more than 300 the inventory of the pre-hydraulic ferrerías of the Basque Country. The ferrerías de monte, or haizeolak, are pre-industrial production workshops, capable of transforming the iron ore into metallic iron, by means of an exclusively manual system. It is known that in the Basque Country they were in operation since the s. V a.C until s. XV, approximately. It is a different oven model, it is exvased (with an open cup shape), and its peculiarity is that it is loaded and discharged from above.

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