Tzankova N.Stavrakeva D.2024-07-102024-07-102024-07-102024-07-102020-08-012535-10600324-089410.52321/GeolBalc.49.2.3SCOPUS_ID:85125877459https://rlib.uctm.edu/handle/123456789/702In this article, we present the results of our study on archaeological slags found near the village of Krushevets, Southeast Bulgaria. Chemical analyses of the slags show a high Fe2O3(40.11-54.57%) and SiO2(29.32-42.28%) content, increased CaO content (3.01-6.51%), as well as very low quantity of SO3(from 0.20% to 0.52%) and P2O5(between 0.23% and 0.30%). The unbound residual copper in the samples is in an amount of 0.41% to 1.07%. The main phases composition of the slags are as follows: fayalite-type silicate phases with impurities, kirschsteinite and laihunite; pyroxenes of the augite-type and amorphous hosted glass; iron-oxide phases (magnetite and maghemite); and copper-containing phases (drops of unbound copper, relicts of ore minerals such as bornite, chalcopyrite), as well as newly formed phases, such as chalcocite, and copper-containing spherical aggregates. The studied samples are a by-product of copper extraction metallurgical activity. The raw material used was of copper-sulfide type with impurities of manganese-, calcium-, magnesium- and aluminium-containing minerals.enArticle