In Morocco, the antimony indices and deposits are divided into three regions: Central Morocco which contains the majority of the indices, the Rif, the Tazekka and Tamlelt massifs. These mineralizations are mainly hosted in Paleozoic terrains, sometimes near outcrops of Hercynian granites outside their aureole of contact metamorphism. They are in most cases in the form of stibine with fracture filling. Antimony deposits are vein-like and belong to several morphological types: deposits of large fractures opposing those of small fractures to which a particular type can be attributed, including that of cracks, and stratiform deposits with mineralization disseminated within the rock sedimentary host.
The pattern of distribution of antimoniferous mineralization in Central Morocco clearly shows their dependence on granite massifs. Lithological control is a key trap for the distribution of mineralization. The preferential alignment of these mineralizations is generally following the major fractures including two tectonic axes of NE-SW direction (Smala-Achemeche; Pays Zaïan-Haut Oued Beht), with a high frequency in the vicinity of the Carboniferous terrains and those of the pre-Carboniferous basement which constitutes the essential element of the search for new mineralized zones. In fact, it is the hearts of the anticlines as well as their flanks that are the best mineralized. Brittle tectonics played an essential role either at the local level of the deposit, or at the regional level of faulted anticlinal folds in determining the distribution of antimoniferous mineralization in the various massifs. The age of emplacement of antimoniferous mineralization is similar to the different massifs having been deposited at the end of the Hercynian orogeny.