In the northwest of China, auriferous altered cataclasite, adular-sericite quartz vein and quartz reef types are present, and metallogenetic epoch is mainly Hercynian period.
西北部地
有蚀变碎裂岩型、冰长石-绢云母石英脉型和石英脉型等，
矿
代为海西期；
In the northwest of China, auriferous altered cataclasite, adular-sericite quartz vein and quartz reef types are present, and metallogenetic epoch is mainly Hercynian period.
西北部地有蚀变碎裂岩型、冰长石-绢云母石英脉型和石英脉型等，矿代为海西期；
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