A 2,400-year-old metalworking site in Senegal is offering new insight into how iron production developed in sub-Saharan Africa, researchers said. The discovery is helping address long-standing questions about whether ironworking in the region emerged independently or spread from elsewhere.
The site, known as Didé West 1, is located near the Falémé River valley in eastern Senegal. Archaeologists uncovered a well-preserved iron-smelting workshop there in 2018. Evidence shows it operated from the 4th century BCE to the 4th century CE, indicating sustained use over several centuries.
Iron production and global timelines
Iron Age timelines vary across regions. In Europe, the period is generally dated from around 800 BCE to the end of the 1st century CE. Earlier evidence of iron production comes from Anatolia and the Caucasus, where it dates to the 2nd millennium BCE.
From these regions, ironworking techniques spread into Europe. Whether similar methods developed independently in Africa remains under debate among researchers.
Evidence of organized local industry
Excavations led by the University of Geneva, in partnership with the Institut Fondamental d’Afrique Noire, revealed a structured system of iron production at the Senegalese site.
Archaeologists identified a large slag heap weighing close to 100 tons, along with about 30 clay tuyères used to channel air into furnaces. They also found 35 circular furnace bases, each around 30 centimeters deep.
A 2,400-year-old iron workshop in #Senegal is changing how we understand early #African technology.
Researchers found a site used for centuries, with advanced furnace design and local innovation in iron production. A rare glimpse into Africa’s deep metallurgical history. pic.twitter.com/ZOj0Y1p5ie
— Tom Marvolo Riddle (@tom_riddle2025) April 1, 2026
These features suggest organized, long-term activity. Researchers believe production was likely carried out on a small scale to meet local needs, including the making of agricultural tools.
Distinct smelting method was identified
The layout and materials at Didé West 1 match a smelting tradition known as FAL02. This method uses small circular furnaces with removable chimneys and large clay tuyères.
The tuyères at the site show a complex design. Instead of a single opening, they contain multiple small outlets connected by side ducts. This allows air to spread evenly at the base of the furnace, improving combustion control.
Researchers also identified a previously undocumented practice. The base of some furnaces contained palm nut seeds used as packing material, suggesting local experimentation with available resources.
Findings highlight continuity and local knowledge
Mélissa Morel, lead author of the study, said the site’s preservation, age, and long use make it highly significant. It offers a rare opportunity to study how iron smelting techniques were maintained and adapted over time.
Anne Mayor, who led the project, said the same technical tradition remained stable for centuries with only minor changes. This contrasts with other African sites, where methods often shifted more quickly.
The findings, published in African Archaeological Review, highlight the importance of local knowledge in shaping early metallurgy. Researchers say ongoing work across Senegal may help clarify how ironworking developed and spread across West Africa.
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