Gold showings on the Vegadeo limestone in the Navelgas- Trevas corridor (West Asturian-Leonese Zone)

In this paper, some results of practical interest regarding the gold mineralisation occurring in the northern area of the Navelgas gold belt (West Asturian-Leonese Zone) are presented. The mineral paragenesis of the Navelgas hydrothermal-type mineralization has been completed with the presence of arsenopyrite, lollingite, native Bi, bismuthinite, gersdorfite, violarite, monazite and parisite. Native gold, although scarce, is mainly associated with pyrite and asenopyrite. Pyrite, predominant sulphide, contains 625 mg-kg-1of invisible refractory gold. Micro-analysis of trace elements in alluvial gold particles indicates the presence of several unknown primary gold showings, likely associated with quartz veins, in the upper basin of the Navelgas river.In the San Feliz area, about 12 km NE of Navelgas, refractory gold (727 mg-kg-1) has been identified in the goethite (pseudomorph of pyrite) within the eluvium overlying the Vegadeo Fm, suggesting the possible existence of deep mineralized areas.