贵州黔东南坑头蚀变岩型金矿的发现及意义

Discovery and Its Significance of the Kengtou Altered Rock Type Gold Deposits in Southeast,Guizhou

坑头金矿位于贵州黔东南金矿带,前人对该金矿带石英脉型金矿进行了广泛研究,认为深部可能有蚀变岩型金矿存在,但都未证实。近期经综合研究,在坑头金矿施工钻孔发现坑头金矿的深部存在蚀变岩型矿体,含金量最高达6. 65 g/t。蚀变岩型金矿矿石中金的赋存状态以裂隙金为主,主要载金矿物为毒砂。硅化蚀变及断层与金矿化关系密切,金矿体位于硅化蚀变发育的构造破碎带中。目前,黔东南金矿的开采目标多为300 m以浅的石英脉型金矿体,因此该发现对黔东南地区金矿深部勘查工作具有重要意义。

Kengtou gold deposit is located in Southeastern Guizhou Gold Belt.Previous workers have made extensive research on quartz vein gold deposits in this Gold Belt,and it is thought that there may be gold deposits of altered rock type in the depth.Nonetheless,it has not been proved.Recently,through comprehensive research,Altered rock type gold ore bodies have been found in the depth of Kengtou gold deposit by drilling,and the gold content in ore bodies reaches up to 6.65 g/t.The gold ore bodies are hosted by silicified altered tuffaceous slate with the gold occured as native gold in fissures within arsenopyrite grains.Silicification alteration and faulting are closely related to gold mineralization,and the gold ore bodies are located in the tectonic fracture zones where silicified alteration developed.At present,the gold mining objects of Southeast Guizhou gold are mainlyquartz veins gold ore bodies which are mostly less 300 m in depth.Therefore,this discovery is of great significance for gold exploration in the depth of the southeast Guizhou.