Abstarct: Halalan 2 manganese mine is located 122 km south of Damghan in the Trud-Chahshirin mextallogenic belt in the northern part of Central Iran. The rocks of the study area are of mextamorphic type including mextamorphic lime, siliceous black schist and light green chlorite schist of Jurassic age. The host rock consists of mextamorphic limestone and chlorite schist, and mineralization in this area has been done in the form of low-grade manganese minerals. The shape of the mineral is lenticular and its texture is a massive and vein - veinlets. In order to study the manganese mineralization phases in this mine, polished and thin-polished sections were prepared from the samples of the mine site and processing plant and studied. Methods such as XRD, FESEM and Raman analysis were used to identify these phases. As a result of the most important mineralization, manganese carbonates include rhodochrosite and kotnahorite. According to FESEM studies, sulfide minerals were found along with rhodochrosite, including chalcopyrite, cobalt-containing pyrite (up to 2.5%), zinc-rich tetrahedrite (up to 10.5%), cadmium-containing sphalerite (up to 6.5%), millerite and covellite. The waste minerals are pyrite, quartz and calcite. ICP and XRF analysis was used for geochemical study of ore and tailings. The host rocks of rhodochrosite are black shales and the host rocks of kotnahorite are light green chlorites schists. Fluid inclision studies were performed on a quartz sample, and baxsed on this, the formation temperature of the mineralizing fluid was between 96 to 112 and the salinity of the fluid was 10.8 to 15.8. baxsed on these results, it can be said that at the first place mineralization was probably sediment-exhalative and then during the first stage of mextamorphism and deformation to the extent of green schist facies, low-grade ore was formed. As a result of mextamorphism, remobilization of manganese by mextamorphic fluids and its collision with limestone has caused the main mineralization and the deposition of manganese carbonate ores along with sulfide minerals.