内蒙古常福龙金矿床隐式地质建模与品位估值

Implicit geological modeling and grade estimation of the Changfulong Gold Deposit,Inner Mongolia

常福龙金矿床为受剪切带控制的低温热液脉型金矿床。由于矿化的三维连续性较差,传统手工圈连矿体难以准确刻画矿化的真实分布。隐式地质建模具有速度快、可重复性强、以数学为依据、人为干扰少等特点,尤其适合处理样品数据稠密且表面形态复杂的问题。通过引入径向基函数(RBF),对常福龙金矿床开展了三维隐式地质建模与品位估值,旨在探讨如何更好地解决复杂不连续矿体的圈定和估值问题。研究表明,在适当的约束条件下,隐式建模可以给出合理的地质模型。RBF估值与地质统计学方法的估值准确度相当,而前者呈现出的矿化结构更为清晰。研究工作对于促进隐式地质建模技术在中国资源量估算领域的应用有着一定的启示意义。

Changfulong Gold Deposit is a low-temperature hydrothermal vein-type gold deposit controlled by shear zone.Due to the poor three-dimensional continuity of mineralization,it is difficult to accurately depict the true distribution of mineralization by the traditional method of hand-digitizing.Implicit geological modeling has the characteristics of fast speed,strong repeatability,mathematical and less man interference,so it is especially suitable to deal with the problems of dense sample data and complex surface morphology.In this paper,the radial basis function(RBF)is introduced to carry out three-dimensional implicit geological modeling and grade estimation of Changfulong Gold Deposit,intended to explore how to better solve the problem of delimitation and estimation of complex discontinuous mineralized bodies.The results show that implicit modeling can make a reasonable geological model under appropriate constraints.The accuracy of RBF estimates is similar to that of geostatistical methods,while the former shows a clearer mineralization structure.The research work in a way enlightens the promotion of implicit geological modeling technology application to the field of resource estimation in China.