Dr Amin Allah Kamali, Dr Mehdi Razani, Dr Sayed Iraj Beheshti, Dr Hamid Fadaei, Msc Vahid Ebrahimzadeh, Volume 8, Issue 3 (8-2026)
Abstract
The Chah Jamal Khoshomang metal smelting sites are located in Yazd Province, in the Kharanaq district east of Ardakan County, approximately 25 km south of Saghand village and 120 km from the city of Yazd. This study aims to identify the smelting technology and the provenance of the ores used at these sites through field investigations, petrographic analysis, and chemical analysis by inductively (ICP-OES) of slag samples collected from two smelting sites. Petrographic results reveal the presence of the silicate minerals pyroxene and fayalite within a glassy matrix, together with metallic phases comprising native copper, copper sulfide minerals (chalcocite and covellite), and the iron-bearing mineral wüstite. The high proportions of silica and iron oxides in the chemical analysis results, together with the presence of CaO and MgO, indicate the use of siliceous and carbonate fluxes to reduce slag viscosity; combined with the observed mineralogical assemblage, this evidence suggests a smelting temperature of approximately 11001200 °C and a reducing, relatively controlled furnace atmosphere. These smelting sites, which were established for copper extraction, also contain lead, zinc, and silver, indicating that the raw ore feeding these furnaces was derived from a polymetallic deposit. Regarding the provenance of this raw material, ancient exploratory tunnels and pits located approximately two kilometers from the sites can be identified as the local source of feedstock for these furnaces. The findings of this study advance our understanding of ancient metal extraction technology in the central Iranian plateau.
The Sofalin Mound is located north of the city of Pishva, on natural hills formed by early Holocene deposits (alluvial sediments older than 4,000 years). Systematic and continuous excavations at the Sofalin Mound have been carried out over the past several years in seven seasons as part of broader archaeological investigations in the Varamin–Pishva Plain. Cultural materials recovered from the Sofalin Mound in the north-central Iranian Plateau have significantly enhanced our understanding of the proto-literate period, dated between 3500 and 2800 BCE, within the cultural sphere of the north-central plateau of Iran. During the sixth and seventh excavation seasons at the Sofalin site, architectural spaces were uncovered in Trench 20. These spaces were documented as featuring cobblestone floors, mudbrick platforms, and rectilinear architectural layouts. Based on ceramic assemblages (plain and painted), clay sealings, and fragmented clay tablets, occupation during different phases of theEarly Elamite cultural period was identified. This research focuses on the technical and laboratory investigation of Early Elamite mudbrick architectural remains from the Sofalin Mound using X-ray diffraction (XRD) analysis, complemented by chemical studies aimed at proposing appropriate conservation strategies. The primary objective of this study is to achieve a semi-quantitative structural characterization of mudbricks from this period in order to enhance our understanding of their mineralogical composition. Such knowledge contributes to the development of effective conservation approaches for the Sofalin Mound as well as other contemporaneous mudbrick archaeological sites.
