综合物化探找矿方法在刚果(金)PE5276矿区铜矿勘查中的应用效果

Application Effect of Integrated Geophysical and Geochemical Prospecting Method Employed in the Exploration of Copper in PE5276 Copper Deposit,Congo(DRC)

PE5276铜矿区位于刚果(金)加丹加省卢本巴希市北部,区内残坡积发育,地质找矿标志不明显,前人曾在B16区东北部开展过化探异常钻探查证工作,仅见少量黄铜矿化,未见工业矿体。针对上述情况,在本区开展新的土壤地球化学测量、激电中梯和高密度电阻率等物化探工作。化探工作发现了1个结构完整、连续性好、浓集中心明显、Ⅲ级浓度分带清晰的Cu异常。物探激电中梯、高密度电阻率法在平面和剖面上查定了异常体的空间分布范围,圈定了找矿靶区。经钻探验证,发现了1个隐伏的硫化物铜矿体,已探获铜资源量3万t,平均品位1.24%。据此,构建了区内地质、物化探找矿模型,总结了找矿标志,为后期找矿提供了一种有效的综合物化探方法、手段。

PE5276 copper deposit is located in the north of Lubumbashi,Katanga Province,Congo(DRC),where residual deluvial deposits are developed and the geological prospecting indicators are not obvious.The previous work of geochemical anomaly drilling and verification has been carried out in the northeast of B16 area,with only a small amount of chalcopyrite and no industrial ore body.In view of the above situation,we have carried out new geophysical and geochemical exploration work in this area,such as soil geochemical survey,induced polarization and high-density resistivity.A Cu anomaly with complete structure,good continuity,obvious concentration center and clear gradeⅢconcentration zone was found in geochemical exploration.In geophysical prospecting,the spatial distribution range of the abnormal bodies and the prospecting target area are determined by using the induced polarization and high-density resistivity method.A concealed sulfide copper ore body has been found through drilling verification,with a copper resource of 30,000 tons and an average grade of 1.24%.On this basis,the geological,geophysical and geochemical prospecting model in the area is constructed,and the prospecting indicators are summarized,which provide an effective integrated geophysical and geochemical prospecting method for later explorations.