The Sierra Almagrera vein-type mineralization contains base metal sulphides and Pb-Sb-Cu-Ag sulphosalts. The sequence of mineral deposition indicates the existance of four mineralizing stages and one supergene alteration: 1) Fe-(As); 2) Zn-Cu-Fe; 3) Pb-Sb-Cu-Ag; 4) Cu-Zn-Fe, and 5) carbonates, sulphates and supergene oxides. In broad terms, it is possible to establish the following conclusions: a) there exist a mineralogical and textural variation with depth, the Pb-Sb-Cu-Ag stage reaching the maximum development; b) a temperature decrease during the formation of sph. I, linked to the progressive increase in Fe-content of the sphalerite has been detected; c) the compositional homogeneity of the bournonite could indicate the existance of a possible tendancy to individually crystallise the Sb and As sulphosalts, according to the trend Bi → Sb → As. -from Author