内蒙古常福龙金矿床Au品位分布特征及其地质意义

The Characteristics of gold grade distributions and its geological significance of Changfulong gold deposit,Inner Mongolia

矿床品位的统计分布特征和变异函数可以提供矿床成因和蚀变矿化三维空间形态与结构的重要信息。基于Micromine三维软件平台,对常福龙金矿床Au品位频率分布、分形分布以及变异函数等特征进行了研究。结果表明,常福龙金矿床Au品位统计分布具有多个成因总体混合的特征,可能与成矿前广泛发育的硅化和绿泥石化基础上叠加主成矿期硅化-钾化、黄铁绢英岩化和Au矿化有关;变异函数分析显示,目前的勘查工程间距选择是合理的,能有效地控制矿体。同时,由于品位分布特征受既有工程和样品分布制约,研究成果可以作为半定量分析,应用于矿山生产和勘查。

Grade statistical characteristics and variation functions offer important information of the ore genesis and the 3D shapes and structures of alteration mineralization.This paper,based on the Micromine software,discussed the frequency distribution,fractal distribution and variation function features of gold grade in Changfulong gold deposit.The study shows that the statistical distribution indicates a characteristic of multi-genesis which might result from the overlaid universal pre-ore silicification and chloritization by the potassic alteration,silicification,phyllication and gold mineralization.The results of variation functions suggest that exploration interval currently used is reasonable and proves effective to control the ore bodies.Meanwhile,the distributions of ore grades are more or less constrained by the existing projects and samples so that the results are better to be used as semi-quantitative analysis for mining and exploration.