Title

E.V. CHEREMAZOVA (Mining University), K.A. NOVOSELOV (IM UB RAS), YU.L. SVETLOVA (Mining University)

Mineralogical and geochemical characteristics of Au­Sb mineralization on Aguijoncillo site (Extremadura, Spain)

The present paper reveals the results of geochemical survey, mineralogical and petrographic research and heavy mineral concentrate sampling within the area of Aguijoncillo occurrence located in the Central Iberian Zone (Spain). The soil sampling permitted to identify contrastive anomalies in antimony and arsenic distribution, which allowed the assessment of mineralization scale. Mineralogical study of the ore samples and native gold from heavy concentrates approved the extensive presence of galena and Pb sulphoantimonites (boulangerite, jemsonite) in ores as well as inclusion of aurostibite and intergrowths of subgraphic (spongy) gold with berthierite and oxides of Sb and Pb sulphosalts. Thus the results assume the complex paragenesis that includes two hydrothermal mineralization stages: early quartz­-gold­-antimonite-­berthierite and late quartz-­sulphosalt with aurostibite.
Keywords: Au­-Sb mineralization, Central Iberian Zone, lead sulphoantimonites, geochemical survey, gold from heavy concentrates.