Abstract:

The Zijinshan Cu-Au deposit, the Yueyang Ag-polymetallic deposit and the Luoboling porphyry deposit all belong to the Zijinshan porphyry-epithermal metallogenic system related to continental volcanic activities. It is based on microscope examination, EPMA, FESEM/EDS, content of elements in ores that occurrences of gold and silver have been studied. Gold not only occurs in the form of native gold in gold ores, but also exists in the digenite and enargite,djurleite and pyrite in copper ores in the Zijinshan Cu-Au deposit. Argentite, submicroscopic silver and silver-bearing galena have been observed in the Yueyang Ag-polymetallic deposit, of which submicroscopic silver exists in the pyrite, galena or between quartz. The silver element is also found in galena, pyrite, chalcopyrite based on the EPMA. The contents of Fe, S, Co, Ni of pyrites indicate that the genesis of the Zijinshan Cu-Au deposit and the Yueyang Ag-polymetallic deposit is in connection with hydrothermal activity conforming to what has been researched.

Key words: Zijinshan ore field, occurrence, pyrite, typomorphism, Fujian