The Au-deposit of the Dungash gold mine area, Eastern Desert of Egypt, is situated in an EW-trending quartz vein along a shear zone in metavolcanic and metasedimentary host rocks. Petrographic and micro-chemical analyses show that the style of alterations (chloritization, sericitization, carbonatization and silicification) and mineralization (formation of sulphides and gold) are not limited to only the auriferrous quartz ore body (massive mineralization) but occurs also in the wall rocks (disseminated mineralization). Foliation, fracturing and shearing of the wall rocks are the major factors controlling the alterations and the mineralizations as these provided favourable channel ways for fluid flow. These fluid flows were generated under post-peak metamorphic greenschist facies conditions. The post-metamorphic hydrothermal origin of different stages of alteration/mineralization are documented based on various observations among which the most important are: (i) relics of undigested wall-rock materials and rutile (being a constituent of the wall rocks) are included in sulphides, carbonates and quartz (mainly concentrated in the quartz ore body); (ii) arsenopyrite, pyrite, gold and carbonate occur in various generations and are distributed over eight parageneses; (iii) the temperature of formation of the hydrothermal minerals varies between 500 °C and <300 °C (using the composition of chlorite and the stability of the (Ni-Co-Fe)AsS minerals (gersdorffite and arsenopyrite)).