Twenty-five furnaces at Didé West: West Africa's iron under scrutiny once again

In the archaeology of metallurgy, quantity is already information in itself. At Didé West, in eastern Senegal, excavations have brought to light the remains of twenty-five furnaces, thirty nozzles for air injection and about one tonne of metal slag: the site is described as one of the oldest and best-preserved metallurgical complexes in West Africa, and the finds are presented as new evidence on the origins of iron technology in the region (Archaeology Magazine, July/August 2026 issue).

It is worth explaining why those three figures matter more than a single spectacular object. An isolated furnace could be an attempt, an episode, an exception. Twenty-five structures in the same context indicate activity repeated over time, with maintenance and rebuilding of the installations. The nozzles are the part of the system that carries air to the charge of ore and charcoal: finding thirty of them means having material evidence of how combustion was fed, not just where it took place. And the slag — the vitreous residue of ore reduction — is what allows the volumes processed to be estimated and, in the laboratory, the temperatures and composition of the charges to be traced back. One tonne is a mass that describes a production, not a proof.

That said, the material available to Redazione Zero stops here. It contains no absolute dates, does not report the dating methods used, and does not specify the extent of the area investigated nor who is conducting the excavation. The definition “among the oldest” thus remains, at this stage, an attribution that the newspaper reports without being able to anchor it to a published chronological range. It is a distinction worth holding firm: the count of furnaces is inventory data, the placement in time is a hypothesis to be verified through subsequent analysis.

From the same issue of the magazine comes a second excavation, of a very different nature. At Áspero, a Peruvian coastal settlement linked to the Caral culture — one of the oldest civilizations in the Americas, which flourished between 3000 and 1800 B.C. —, a complex of circular stone platforms has emerged which scholars interpret as an early astronomical observatory, from which the movements of the sun, the moon and the stars would have been tracked. According to the same reconstruction, the observation served to anticipate seasonal changes, to plan fishing expeditions and to manage coastal resources (Archaeology Magazine).

Here the register is openly interpretive, and the difference from Didé West is instructive. In the Senegalese case, objects are being counted; in the Peruvian case, a function is being attributed to an architectural form. The two operations carry different degrees of solidity: the astronomical function of a building is supported by alignments measured and compared with the positions of the stars at the time of construction, elements that the available material does not report. The newspaper therefore reports the hypothesis as such, attributed to the scholars who formulated it.

On both stories it must be stated clearly: the news currently comes from a single source (Archaeology Magazine, a publication of the Archaeological Institute of America); no independent confirmation available. There are no excavation reports, statements from Senegalese or Peruvian archaeological authorities, nor peer-reviewed journal articles in the material in our possession to which readers could be referred.

What makes both reports useful regardless is their geography. West Africa and the southern Pacific coast remain areas where the available material documentation is scarcer than in the Mediterranean basin and the Near East. The next step, for those who wish to follow the two projects, is the publication of the dating of Didé West and the surveys of the alignments at Áspero: without those two documents, the twenty-five furnaces remain an inventory and the circular platforms a hypothesis of interpretation.