Garab manganese deposit is located at a distance of 185 km, northwest of Tehran (32 km, northeast of Taleghn town)  in  Central Alborz zone. The Eocene and Oligo-Miocene volcano-sedimentary rocks have a considerable extent in the study area that are restricted to a NW-SE trending belt .
With respect to host rock, texture,   structure and  position in stratigraphic column, manganese   mineralization   occurs in three horizons in Oligo-Miocene volcano-sedimentary sequence  :
Stratiform manganese  hosted by red lithic tuff (main horizon of Garab manganese- horizon I).
Lenticular manganese hosted by tuffic limestone (Garab mine district - horizon II).             
 Laminated and disseminated manganese hosted by reddish-brown lithic tuff (Dehdar  horizon- horizon II).
Mineralization occurs in stratiform-lenticular orebodies stretching out for about 25 km  and showimg massive, banded, laminated, disseminated, colloform, botryoidal and open space filling textures. The ore paragenesis  consists predominantly of  psylomelane, braunite, pyrolusite, cryptomelane and hausmannite. Fluid inclution studies reveal that homogenization temperatures range between 180 to        190 ˚C and salinity  changes from 18.6 to 23.4 %wt NaCl equivalent.
 Garab deposit, in comparison with different types of volcano- sedimentary manganese deposits shows broad similarities with the Cuban-type deposits such as tectonic, geological environment, host and associated rock types, geometry, textures, structure and mineralogy.
Based on geometry, texture,  structure, host rock, ore forming environment, geochemistry and fluid incluion, manganese mineralization in Oligo-Miocene volcano-sedimentary sequence occurs in  continental rifting environment and is attributed  to volcano-sedimentary activities.