The orebodies occur in quartz diorite-porphyry and diorite-porphyrite; which were formed in the early Yanshaniaw orogenic phase and are both: parent !rocks and host rocks of the orebodies. The main metallic minerals are chalcopyrite, pyrite, bornite, native gild and, eiectrum: The main ..gold-containing minerals are pyrite and chalcopyrite. The mode of occurrence of gold in minerals has-been studied by means of ore microscopy, mineral chemistry, phase analysis and electron microprobe and transmission-electron microscope. It is found that micro-goad occurs in chalcopy- rite as inclusions with diairieters of 5-20µ, while submicrogold appears as sphe- rules, chains,. or. in irregular shapes, occurring on the crystal faces or in the microcracks of pyrite. According. to electron probe analysis, the fineness of gold is 790-850 with an average value of 815. Phase analysis showed that the content of gold reach ed 85一95 percent, which indicates that gold occurs as minerals. In China, there is more or‘ less gold' in the porphyry copper ores in districts as Yulong, Dexing, Duobaoshan etc. To find out the enrichment zone such and horizon of gold and its mod-of occurrence will have important significance to development comprehensively the porphyry copper deposits so as to raise their commercial value.