Papua New Guinea，located in the joint of the Eurasian plate，the Indian-Australian plate and the Pacific plate，has experienced complex tectonic evolution process since Late Cretaceous，forming a unique trench-arc-basin system and causing a wide development of supergene epithermal gold deposits genetically related with magmatic arc．The supergene epithermal gold deposits in this region can be divided into high-sulphur type and low-sulphur type．According to the different mineral compositions and minerization depths，the low-sulphur deposits can be further divided into four sub-types，i． e． quartz-sulphide sub-type，carbonate-base metalsub-type，supergene epithermal quartzsub-type，and adularia-sericite epithermal sub-type． Different sub-types of low-sulphur gold mineralizations are