Abstarct: Abstract In the present study, the geochemical and mineralogical characteristics of the Thakt coal sopils, Minoodasht city, are investigated. For these purposes, six representative spoil samples were collected. The geochemistry of the samples were studied using XRF and ICP-OES analyses, microscopic studies, XRD and SEM-EDX spectra. To investigate the potential of Acid Mine Drainage (AMD) by the sopil sampels, different static tests including pH and EC measurement of saturated paste, Acid-baxse Accounting tests (ABA), and Net Acid Generation (NAG) / Net Acid Potential (NAP) test was applied. baxsed on the geochemical data, the studied samples are not enriched in Fe, Mn, Ni, Zn, slightly enriched in Cu and Cd, moderately enriched in Mo, highly enriched in Sb and Pb, and strongly enriched in As. Quaterz, muscovite, clinochlore and kaolinite are the major mineral phases in the studied samples. Static tests indicate that all studied samples are characterized by pH < 5.5. Moreover, pH NAG in most samples is < 4.5, NAPP and NNP values of all samples are positive and negative, respectively. Also, NAP and NAG values confirm the possibility of AMD production by the studied samples. Geochemical diagrams confirm the formation of AMD by disposed spoils. Therefore, the formation of acid drainage is likely through the oxidation of spoils discarded around the mine. Regarding the environmental hazards imposed by acid mine drainage, the proper management of the spoils in the study area deems necessary.