The central Jebilets located to the south west of the Moroccan meseta represent a metalliferous province containing numerous deposits and massive sulphide index, of which the Koudiat Aïcha deposit is one of them. This last enclosed in the series of Saghlef attributed to the upper visean. It is predominantly pyrrhotite, contains minerals of the base metals such as sphalerite, galena, chalcopyrite, arsenopyrite and some traces of stannite. The orebody is enclosed in argillites interspersed with gabbroic magmatic sills at the footwall and hanging wall of the mineralization. It is materialized on the surface by the development of a gossan with iron oxides and hydroxides (hematite, magnetite, goethite, limonite, malachite ...), and shows an NS orientation according to the direction of the orebody. This study intersted with the search for distinctive criteria between gossan assigned to mineralization of economic interest in relation to massive sulphide and those developed on iron deposits or other non-economic iron indices near the sector of Koudiat Aïcha. This approach has made it possible to identify criteria that make it possible to distinguish the gossan of products directly from polymetallic base metal mineralization. The elements analyzed, such as Ag, As, Bi and Sn, in addition to the elements searched, made it possible to identify the gossan directly assigned to the Koudiat Aïcha deposit and to pinpoint its location. The results obtained are in good agreement with the data of the magnetic and gravimetric studies realized in carried out around the area of Koudiat Aïcha deposit. These results can be applied to all the ferruginous indices near the sector of Koudiat Aïcha in the Central Jebilet, see its extrapolation towards all the Hercynian lands.

The central Jebilets located to the southwest of the Moroccan meseta represent a massive VMS province whose Draa sfar deposit is one of them. The latter predominantly pyrrhotite, contains minerals of the base metals, enclosed in the Saghlef series attributed to the higher visean. The area of Draa sfar is materialized on the surface by the development of gossan with oxides and hydroxides of iron (hematite, goethite, limonite, malachite ...), and shows an orientation NS in the direction of the ore body. The analyzed elements such as Ag, As, Bi, Sn and Te in addition to the desired base metals, made it possible to identify the gossan directly linked to the Draa sfar deposit, and to clearly identify its location. They can be used as a guide to prospecting for gossan and these results can be applied to all gossan around the Draa Sfar area in the central Jebilets and its extrapolation to all Hercynian terrains.

The central Jebilets are occupied by the Saghlef series attributed to the upper Visean, are materialized by a predominance of the gossans, some of which directly cover massive sulphide predominantly pyrrhotite. These gossan with oxides and hydroxides of iron can be distinguished from East to West in three main plurikilometric axes sub-parallel to the meridian direction. The present study is concerned with the interpretation of geochemical data covering all Central Jebilets gossans. The analyzed elements such as Ag, As, Bi, Sn, Mo and Te, in addition to the base metals researched, made it possible to classify these gossans into three classes: 1) very promising class contains the Draa sfar and Koudiat Aïcha deposits, 2) moderately promising class includes the Kettra deposit and Ben Slimane and Lachach indices, 3) and the least promising class contains the rest of the sites. These chemical elements can be used as a basic prospecting guide for gossan in Central Jebilets province and extrapolate these results to all Hercynian lands.