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《Geological Review》 1988-04
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MODES OF OCCURRENCE OF GOLD IN THE JINGYIA GOLO DEPOSIT

Qian Dingfu;Li Yiheng;Li Zhongsheng;Sheng Henghai Zhengzhou Branch of the Institute of Multipurpose Utilization of Mineral Resources, MGMR  
The Jingyia gold deposit lies in the east part of th southwestern Guishou- western Guangxi gold belt. The host rocks of the gold deposit is Middle Triassic clastic rocks. The NW-trending fractures are the main passage ways for ore fluids and control the distribution of the orebodies. Based on microscopic observations, clectron-probe analysis,determination of the gold content in various minerals in the ore and gold carrier phase analysis, it is shown that there is no visible gold in the ore and that the gold occurs as micro- scopic invisible gold in sulfides (mainly arsenopyrite). The gold content (300—400 g/t) of arsenopyrite is 20—30 times that (10—15 g/t) of pyrite, and the gold occupancy (70—75%) of all arsenopyrite in the ore is 5—7 times that (10—15%) of all pyrite. This feature of gold distribution is rarely seen in various gold depo- sits all over the world. Electron-probe analysis shows that the distribution of the invisible gold in sulfides (especially arsenopyrite)is rather inhomogeneous; therefore, gold probably occurs as submicroscopic particles in sulfides. A detailed study alsp shows that the gold content of the sulfides, especially that of arsenopyrite, distinctly increases with a decrease of their grain size.
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