Geology and Ore Deposits of the Chin-qua-shih Mine District (2)

Characterisitics of Mineralization

Abstract

Mineralization of the ore deposits of the Chin-qua-shih Mine is classified into three stages as follows :
Stage Mineralization Ore and gengue minerals
[I] Alteration of wall rock Chlorite, quartz, pyrite, alunite, argillite
[II] Precipitation of Cu Minerals Enargite, (pyrite), (quartz)
[III] Precipitation of Au and Ag Minerals Limonite with Au, Ag, (barite), (quartz)
The above classification was based on the differences in the mineral paragenesis, the Au-Ag ratio and the distribution of minor.
Authors conclude that limonite of the third stage accompanying Au and Ag minerals is not an oxidation product from pyrite of the second stage, but is a direct precpitate from a hydrothermal solution of the third stage.