1 Introduction1.1 Location and accessLocated in western Alxa Zuoqi, western Inner Mongolia(40°10'30"-40°12'06"N, 104°57'55"-104°59'49"E), theZhulazhaga gold deposit is the largest gold deposit that wasfirst found in Mesoproterozoic sedimentary sequencesalong the north margin of the North China craton, and oneof the most important discoveries of gold exploration inChina in recent years. It was discovered by the No. 1Geophysical and Geochemical Exploration Party of InnerMongolia as a …