The presence of metallurgical operations associated with arsenical copper alloys during the Full/Late Copper Age, as well as, the cupellation of silver during the Late Iron Age or Roman occupation at Castelo Velho de Safara (Moura, Portugal) have already been identified. A slag like material on the inner surface of a ceramic pot bottom, probably belonging to the Late Iron Age, constitutes an additional metallurgical remain from this archaeological site. This material was analysed by Energy Dispersive X-Ray and Micro X-Ray Fluorescence spectrometries in order to determine its superficial compounds. The slag composition points out to the smelting of lead ores which inevitably takes place at high temperatures (≈1000oC). However the ceramic body do not show any signs of vitrification or slagging which indicates that this ceramic artefact had no direct participation on the smelting operation.
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