Ancient metallurgical slags from the Rossen Ore Region – a potential raw material for the production of copper and lanthanides.

copper-in-slag

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 amorfous (slag glass) phases of the copper slag is determined 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 production of copper and the lanthanides lanthanum and cerium.

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Chemico-mineralogical characterisation of ancient slags from Rosen Ore Field. Part 2 – Korucheshme and Rosen deposits, metallurgical center „Atiya“

chrysocolla_slag

Tzankova, N., D. Stavrakeva, P. Leshtakov, K. Dimitrov. 2016. Chemico-mineralogical characterisation of ancient slags from Rosen Ore Field. Part 2 – Korucheshme and Rosen deposits, metallurgical center „Atiya“ – Univ. Min. Geol., 59, 1, Geol., 61-66 (in Bulgarian with English abstract).

 

ABSTRACT. The ancient slags, found in the Rosen ore field were researched. They were collected from the surface of several ancient metal production centers located near the ancient mines in Medni rid. The mining of copper there is referred to the period 6th century B.C. – 4-5th century A.D. The chemical composition of the samples was determined based on data from ICP-OES. The slags have high Fe2O3 and SiO2 content. Their mineral composition was studied with the help of optical microscope in transmitted and reflected light, with the methods of X-ray powder diffraction аnd with electron probe microanalyses. It was found that the slags consist mainly of iron-containing phases such as fayalite, magnetite, maghemite, wustite, kirschsteinite, presence of copper drops and copper-sulfide aggregates. The studied materials are defined as by-products, produced from the heat treatment of copper-iron sulphide ore for copper mining in ancient times.

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Chemico-mineralogical characterisation of ancient slags from Rosen Ore Field. Part 1 – Propadnala voda deposit

slag

Stavrakeva, D., N. Tzankova. 2016. Chemico-mineralogical characterisation of ancient slags from Rosen Ore Field. Part 1 – Propadnala voda deposit. – Univ. Min. Geol., 59, 1, Geol., 55-60 (in Bulgarian with English abstract).

ABSTRACT. The objects of this study are ancient slags from the vicinity of Propadnala voda deposit, Rosen ore field. With the methods of optical microscopy in transmitted and reflected light, X-ray powder diffraction, chemical analyses by ICP-OES, CEM and X-ray microanalyses, is was found that the slags consist mainly of iron-siliceous and iron-oxide phases. The analyzed samples are with high iron content, the presence of copper, sulphur, sulfide aggregates, impurities of phosphorous, cerium and lanthanum. Macroscopically and microscopically spherical drops of copper are observed in all studied samples. The analyzed slags are evidence of ancient metal production in the area around Propadnala voda deposit and represent a by-product product of copper mining activity in which the copper sulfide ore was processed.

 

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