Contribution à l'étude géologique du gisement à Cu, Zn, Pb et Ag-Au d'Amensif (District minier d'Amizmiz, Haut Atlas occidental, Maroc)/[ Contribution to geological study of Amensif Cu, Zn, Pb & Ag-Au deposit (Amizmiz mining district, Western High Atlas, Morocco ]

The geological, magnetic and mineralogical studies have uncovered a polymetallic mineralization deposit at Amensif in the Amezmiz mining district (western High Atlas, Morocco). The Cu, Pb, Zn, Ag and Au mineralizations are hosted in the Lower Cambrian volcano-carbonate formations. These formations are structurally controlled by Hercynian faults (NESW, ENE-WSW, E-W and NW-SE). These hercynian faults were facilitated the circulation of hydrothermal fluid that responsible for the implementation of the economically mineralization. The hydrothermal alterations having affected the Lower Cambrian volcano-carbonate formations of Amensif are in mutual relations with the genesis of the Cu, Pb, Zn, Ag and Au polymetallic mineralizations. Mineralogical study of this deposit reveals the presence of a particular and characteristic mineral assemblages composed of chalcopyrite, sphalerite, galena, arsenopyrite, pyrite, grey copper, minor amount of silver, gold and bismuth. The geological setting, lithofacies, mineral assemblages, geochemical analyses and a mode of hydrothermal alteration remind those described in certain "High-temperature polymetallic Carbonate Replacement Deposits" type worldwide.