内蒙古莲花山铜矿区兴安科1井找矿新发现及地质意义OA

Objectives:The Lianhuashan area in Tuquan County,Inner Mongolia,is located in the central—southern segment of the Great Hinggan Mountains(Great Xing'an Range)copper polymetallic metallogenic belt.Tectonically,it lies in the superimposed zone of the Paleo-Asian Ocean and the Circum-Pacific tectonic domains,indicating favorable metallogenic geological conditions.However,over the past two decades,regional prospecting progress has been slow,and the only active Lianhuashan copper mine in the area is nearly depleted. Methods:Based on a systematic synthesis of regional metallogenic patterns and geophysical—geochemical anomalies,our team predicted a second deep prospecting domain in the area,which prompted us to deploy a scientific borehole reaching 920.15 m(nearly 1 km in depth). Results:The drilling results first discovered scheelite mineralization in the area,with WO3 grades ranging from 0.10％to 0.25％,occurring in pyrite—chalcopyrite—quartz veins and arsenopyrite—chalcopyrite veins.In addition,multiple intervals of thick,high-grade copper—silver orebodies were intersected at depth.Copper mineralization is present in several intervals from 227.30～920.15 m.Notably,at depths of 578.25 m and 762.15 m,pyrite—chalcopyrite veins show apparent thicknesses 1 m,with Cu grades reaching 1.43％and 2.64％,respectively.Silver,as the main associated element,reaches a peak grade of 28.9 μg/g.Furthermore,in the deep interval of 820～850 m,the average silver grade is 2.28 μg/g,correlating well with elevated copper grades and indicating significant deep prospecting potential. Conclusions:This drilling validated predictions based on geophysical—geochemical anomalies and the metallogenic model,extending the deep prospecting space to elevations below-500 m.It provides direct evidence for resource expansion at the mine and has already prompted the mining company to deploy follow-up verification drilling.The paragenetic association of scheelite with copper—silver mineralization suggests the possible superposition of two mineralization events,offering new insights into the metallogenic evolution of the central—southern the Great Hinggan Mountains(Great Xing'an Range)and providing a compelling case study for regional prospecting breakthroughs.