The Sakaro deposit is a vein-type fault-hosted gold deposit in the Adolarnarea, southern Ethiopia. It is composed of quartz veins up to 9.3 m widernwhich occupy fault planes along foliation and petrographic contacts inrnprecambrian low-grade metamorphic rocks. The veins are gold-rich and sulfidepoor,rnforming a mineralized zone of 760 m in strike length and up to at leastrn150 m in vertical extent. Veins Nos. 1 and 2 are the richest shoots with anrnestimated total ore reserves of 760,800 tons capable of producing 2,551 kgrnof gold at an average grade of 3.4 gft and 5.7 gft respectively.rnGeochemical and mineralogical studies of the ores and the host rocksrnreveal that the Sakaro deposit might include tungsten other than gold as arnpotential exploration target. Tungsten minerqlization is the earliest to bernformed. Tungsten content increases up to >1% in the ore veins and in the wallrnrocks (mainly in amphibolites proximal to the veins), forming a distinct zonernthat assumes W-As-Cu, a geochemical zone or wolframite-scheelite-ironrnsulfides zone, a mineralogical zone.rnGold is mostly associated with Ag and Pb, showing asymmetricalrndispersion pattern that starts in the hanging wall side of the vein andrndecays towards the foot wall rocks. Its tight relation with Ag and Pb isrnexpressed by forming a Au-Ag-Pb zone though it is also related at a lesserrndegree "dth other elements especially with Cu. Outward from this zone, Ag-Pbcu,rnW-As-Cu, and Fe-Co-Ni-Mo-Cu follow in respective distances from the orernveins toward enclosing rocks.rnGold distribution in the are veins is controlled by thickness variationrnof the quartz fillings in both strike and dip directions, poor in swells andrnrich in constrictions. In the plane of the main vein, five are columns arernidentified with marked contrast in gold mineralization: (1) obliquelyrnrunning I EW dipping gold rich zone I (2) northerly trending, verticallyrndipping gold rich zone, (3) intermediate low gold zone, (4) oxidation zone,rnand (5) surficial weathering zone. The first two zones are ore shootsrnrepresenting the fronts of gold depositing mineralizing fluids. Gold contentsrnfollow a systematic pattern of more or less regular course within and awayrnfrom these fronts which otherwise are perceived as very irregular and erraticrndistributions. loloreover, statistical treatment on the metal content showsrnthat gold distributions in populations separated according to the rock typesrnand environments obey lognormal law, with mean values highest in ore veins,rnless in amphibolites, and least in mica schists.rnstudies on the vein development reveal three distinct types of hypogenernmineralization from veins margins to the center, of marcasite + chalcopyriternin the peripheral parts, galena + chalcopyrite + marcasite in the followingrnportion, and sphalerite + high galena + chalcopyrite in the central part.rnGold is present in all of the above associations, however, it is highlyrnenriched in sphalerite-high galena-chalcopyrite zone, followed by hangingrnwall side marcasite-chalcopyrite zone, and least in foot wall side marcasitechalcopyriternzone. The gold enrichment in sphalerite-high galena-chalcopyriternzone indicates the close association of Au, Ag, Pb, Cu and Zn. The selectivernenrichment of gold in the hanging ''1all side (marcasite-chalcopyrite) zone isrnmost likely due to intense shear remobilization effects.rnThe veins display a crude ascending mineral sequence, from depth to thernsurface, of pyrrhotite, gold + galena + sphalerite + chalcopyrite + ironrnsulfides (productive zone) I and marcasite. A descending sequence in the zonernof weathering ShO"'S that Fe-hydroxides and Fe-disulfides grade downward whererngold is enriched "lith secondary minerals of Pb, Cu, Zn. In the enclosingrnrocks, wolframite + scheelite + Fe-sulfides form a zone adjacent to the arernveins and marcasite + pyrrhotite + chalcopyrite in distal areas. These zonesrnare in agreement with geochemical zones W-As-Cu and Fe-Co-Ni-Mo-Curnrespectively.Disulfidization process of iron monosulfides increases in the upperrnlevels of the deposit alld is more intense at the vein margins especially inrnthe hanging wall side of the ore veins due to shearing which is alsornresponsible for recrystallization of quartz at the vein selvages.rnThe vein mineralogy shows as the vein development is the result ofrnmultiple episodes of vein opening and filling characterized by wolframitescheelite-rnquartz, sulfide-gold-quartz and disulfide-carbonate stages.rnstatistical parameters of distribution of the components, orerngeochemistry, peculiarities of horizontal (along the strike and across thernthickness) I vertical and three dimensional geochemical and mineralogicalrnzonation of the mineralized rocks and the general sequence of formation ofrnminerals in ores of the sakaÂ·ro deposit considered and proved in the thesisrnare the features of its genetic model. These features are also of practicalrnimportance for are blending and further improvements of are dressingrntechnological schemes. They are of value and use in prospecting for similarrnmineral deposits in the region and their successful exploration.