The Nieèr Co Mg borate deposit is a Mg borate deposit discovered recently. The authors studied regional geological data and geological features of the deposit, compared this deposit with other borate deposits in China and abroad, analyzed the source of oreforming materials and metallogenic mechanism, and summarized the metallogenic pattern. The Nieèr Co Mg borate deposit formed in the uppermiddle Holocene; its host rocks are mainly divided into three horizons: the upper and middle orebearing horizons are dominant minable horizons and the lower orebearing horizon is a subordinate orebearing horizon. The ore types include kurnakovite granular aggregates, mirabilitebearing kurnakovite, beehive/massive pinnoite and mixed ore type. The former two types are main minable ores, while the latter two types are subordinate. Comparative study of the mineral deposits indicate that the Nieèr Co Mg borate deposit and the Chagcam Caka Mg borate deposit, which is located nearby to the north of Nieèr Co, have the same borate assemblage and metallogenic geological environment, belong to the same type of mineral deposit but and differ from other borate deposits in the world. The oreforming materials of the deposit were mainly derived from Neogene volcanic rocks and geothermal water. The collision of the Indian plate and Asian plate resulted in the formation of extensive Neogene volcanic rocks rich in oreforming materials such as B, Li, Mg and Na in the south of Nieèr Co near the Bangong CoNujiang suture zone, and large quantities of oreforming materials were carried into the lake by geothermal water and meteoric water. Lake water was concentrated into saturated oreforming solutions rich in sodium salt under the arid climatic conditions, in which kurnakovite, pinnoite and other minerals were precipitated, thus forming a Mg borate deposit in Nieèr Co