Stavrakeva, D., N. Tzankova. 2016. Ancient metallurgical slags from the Rossen Ore Region – a potential raw material for the production of copper and lanthanides. – Geology and mineral resources, 6, 36-40 (in Bulgarian with English abstract).
Abstract. Studied are ancient slags with chemical and mineralogical methods from the areas of the deposits „Propadnala voda“, „Korucheshme“, „Rossen“ and from the metallurgical center „Atia“ in the Rossen Ore Field. It was found, that the ancient inhabitants of the region produced and refined copper sulfide ore. Due to imperfect ancient metallurgical process, in the slags is present residual copper with contents, which exceed the current condition for copper production. Certain forms of binding copper are described: free copper in the forms of drops, matte aggregates, copper and copper-iron oxides. In all the crystalline and amorphous (slag glass) phases of the copper, slag is determined a presence of lanthanum, cerium, and phosphorus, which all are associated with the presence of the mineral monazite in the initial raw material. The ancient metallurgical slags from the Rossen Ore Region are a potential raw material for the production of copper and the lanthanides lanthanum and cerium.
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