云南蒙自白牛厂银多金属矿床矿体变化规律与勘查系统优化

发布时间：2018-05-11 14:26

本文选题：矿体变化规律 + 变异函数　；参考：《昆明理工大学》2016年硕士论文

【摘要】：云南省蒙自县白牛厂银多金属矿床位于滇东南地区,属于超大型矿床,也是一个因为勘查工程布置不合理而影响开发的一个典型矿床。矿体的变化规律是决定勘查网度的重要因素,合理的勘查网度应该依据矿体变化规律研究结果来确定。勘查系统优化主要内容是在系统的分析矿体变化规律情况下,根据所确定的最佳勘查网度,对预测靶区进行合理工程布置,以达到对矿体的最佳勘探效果。随着地质统计学的不断发展,变异函数已经成为研究矿体变化规律的最重要的方法之一。本文通过系统的研究白牛厂矿体的变化规律,运用传统方法对不同矿段进行了勘探类型划分。并根据各矿段的不同特点,以变异函数为工具,分别构建了主成矿元素在整个矿区及各矿段的品位变异函数模型,通过变程确定了合理的勘查网度。根据矿体的三维空间模型和勘查工程的关系,结合矿体变化规律和最优勘查网度,确定了找矿靶区位置,设计了合理的勘探工程。主要成果如下：(1)白牛厂矿床的V1矿体的边界形态、矿体厚度和品位变化性具有较大差异,在白羊-穿心洞矿段变化较大,较为复杂,在对门山-阿尾矿段变化相对较小。其矿体变化程度在勘查时被低估,并且未考虑其变化的不均匀性。经过本次研究,白羊-穿心洞矿段属于第Ⅱ勘查类型,而阿尾-对门山矿段属于第Ⅰ勘查类型。(2)V1矿体虽然整体呈似层状,但是在白羊-穿心洞矿段,由于断层和褶皱的综合作用,矿体边界形态与其他部位相比较为复杂。矿体厚度变化总体来说相对稳定,但是在褶皱形成的虚脱空间内厚度较大。通过对主成矿元素的品位变化系数分析,Ag、Pb、Zn元素具有相似的分布规律,都具有空间变化较不均匀,从北西向南东逐渐减小的特点。(3)对矿山内432个钻探工程的6265个样品数据进行地质数据库的建立,经过样品处理后进行统计分析。基于地质统计学理论,以变异函数为主要工具,创建了不同矿段Ag、Pb、Zn元素品位变异函数模型。其中,三种主成矿元素的连续性在走向上最好,倾向次之,厚度方向最差。根据变异函数的变程,确定了不同矿段的最佳勘查网度,与传统方法确定的勘查网度相比更加精确,建议白羊-穿心洞矿段勘查网度为50×30m,对门山-阿尾矿段因变化性较小,勘查网度可采用80×75m。(4)通过矿体三维立体模型结合厚度及品位变化规律,推测在穿心洞矿段和对门山矿段西南侧可能隐伏有厚度较大品位较好矿体,但是根据探矿工程的三维立体图看出,目前矿山在此处工程较少,不能很好揭露隐伏矿体,需要进一步在中段及地表增加工程,达到所需勘查网度。
[Abstract]:The BaiNiuchang silver polymetallic deposit in Mengzi County of Yunnan Province is located in the southeast of Yunnan Province. It belongs to a super large deposit and is also a typical deposit affected by the unreasonable arrangement of exploration engineering. The variation law of orebody is an important factor to determine the net degree of exploration, and the reasonable degree of prospecting net should be determined according to the results of the study on the variation law of orebody. The main content of the optimization of the exploration system is to make reasonable engineering arrangement of the predicted target area according to the optimum exploration net degree determined by the systematic analysis of the variation law of the orebody in order to achieve the best exploration effect on the orebody. With the development of geostatistics, variation function has become one of the most important methods to study the regularity of ore body change. Based on the systematic study of the change law of the Biniuchang ore body, the exploration types of different ore sections are divided by traditional methods in this paper. According to the different characteristics of each ore section and using the variation function as a tool, the model of the grade variation function of the main ore-forming elements in the whole mining area and each ore section is constructed, and the reasonable exploration net degree is determined by the variation range. According to the relationship between the three dimensional spatial model of ore body and exploration engineering, combined with the variation law of ore body and the optimum exploration net, the location of prospecting target area is determined, and a reasonable exploration project is designed. The main results are as follows: (1) the boundary morphology, thickness and grade variation of the V1 ore body of the Baiyangshan-Qianxindong ore deposit are quite different, and the change is relatively small in the Baiyang-Chuanxindong ore section, and the change is relatively small in the Wangmenshan-A tailings section. The variation of orebody is underestimated in exploration, and its inhomogeneity is not taken into account. After this study, the Baiyang-Chuanxindong ore formation belongs to the second type of exploration, while the Awei-Waimenshan ore body belongs to the first type of exploration, the Qian2Pao V1 orebody, although the whole ore body appears to be layered, but in the Baiyang-Jingxindong ore section, Because of the comprehensive action of faults and folds, the boundary morphology of ore body is more complex than that of other parts. The variation of ore body thickness is relatively stable, but the thickness is larger in the collapse space formed by fold. Through the analysis of the coefficient of grade change of the main ore-forming elements, the elements of AgPb ~ (2 +) Zn have a similar distribution law, and all of them have uneven spatial variation. The geological database of 6265 samples from 432 drilling projects in the mine was established from the characteristics of gradually decreasing from NW to SE, and statistical analysis was carried out after sample processing. Based on the theory of geostatistics and taking the variation function as the main tool, the variation function model of the element grade of AgPbPb-Zn in different ore sections was established. Among them, the continuity of the three main ore-forming elements is the best, the tendency is the second, and the thickness direction is the worst. According to the variation of variation function, the optimum exploration mesh of different ore sections is determined, which is more accurate than that of the traditional method. It is suggested that the exploration mesh of the Baiyang-Chuanxindong ore section is 50 脳 30m, and the variation of Yimenshan-Atailong ore segment is small. Based on the three-dimensional model of orebody combined with the law of thickness and grade change, it can be inferred that there may be a orebody with higher thickness and better grade in the southwestern side of the Xuxindong ore section and the Yuimenshan ore section. However, according to the three dimensional drawings of the prospecting project, there are few projects in this area at present, which can not expose the concealed orebodies well, and it is necessary to further increase the engineering in the middle section and the surface of the earth to reach the required survey mesh.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.2

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