Abstract: The host strata of the deposits in the metallogenic belt are Perimian system to Tertiary system which are mainly composed of elastic rock formation，volcanic rock formation and red，salty elastic rock formation．The occurrences of the ore bodies are mainly veins，networks and lens-shaped．In order to know the regional metallogenetic epoch and regularities，quartz from the major ore-forming stage of Jinman copper deposit and Shuixie copper (cobalt)deposit was analyzed by the 40Ar-39Ar fast-neutron activation dating technique．which gives well-defined plateau ages of 56．7±1．0Ma and 59．2±0．8Ma，respectively． Each isochron age is corresponding to the plateau age respectively within the range of error．The Ar-Ar ages represent the forming ages of quartz，i．e．，the forming ages of the ores of Jinman and Shuixie deposits．