The Chin-qua-shih Mine is one of the large metal mines in northeastern Taiwan. Geologically the Chin-qua-shih area is composed of sedimentary rocks of Neogene Tertiary and dacite intruding the former.
The Cin-qua-shih Mine ore deposits are found in these rocks and consist of gold, silver and copper minerals. Each of these ore bodies is controlled by faults and dacite intrusion. They are classified into the following types by the mechanism of fissure formation:
Vein type……Honzan, Heikomyaku, Daisan-chojen, etc.
Massive type……Daini-chojen, Sosekizan, Sosan, etc.
The process of mineralization seems to have been repeated as follows:
1) Formation of weak zones which may have been fault zones caused by folding.
2) Intrusion of dacite.
3) I st fissuring and mineralization of pyrite, alunite and silicification almost without gold, silver and copper minerals.
4) II nd fissuring and mineralization of gold and silver-bearing enargite.
5) III rd fissuring and mineralization of limonite, accompanied by gold and silver minerals.
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