山东苍山县凤凰山铁矿铁品位统计分析

Statistics and Analysis on Iron Grade of Fenghuangshan Iron Deposit in Cangshan County of Shandong Province

凤凰山铁矿床位于苍峄铁矿带东南延伸部位,为隐伏矿床,赋存于泰山岩群山草峪组地层中,由太白向斜构造控制。矿床发育南北2条主矿带,赋存矿体5个,规模为中-偏大型沉积变质铁矿。利用该矿区25个钻孔的915件样品的铁品位数据,采用垂向100m的间距分析其品位的平均值、标准差、变异系数和大于工业品位的矿石所占比例等统计参数,探讨了矿体厚度与品位的相关关系以及在走向上的品位变化。研究发现:沿垂向存在2个矿化富集地段,分别为-200～-300m和-500～-600m;沿走向以中部为矿化富集地段。南北2个矿化带厚度与品位沿走向及倾向具有不同的相关变化。

Fenghuangshan iron deposit locates in southeast extension parts of Cangyi iron deposit belt. It is a hidden deposit, occurred in Shancaoyu formation of Taishan group, and are controlled by Taihai syn- cline. Deposits were formed by two main ore belts in north and south parts, and occurred 5 ore bodies. It is a medium-large scale metamorphosed sedimentary iron deposit. By using iron grade datas of 915 sam- ples gained from 25 boreholes in mining area, with the spacing of 100m in vertical direction, statistical pa- rameters, such as average value, standard deviation and coefficient of variation which is greater than indus- trial grade ore proportion have been analyzed, relationship between thickness and grade of ore bodies and grade variation on the trend have been studied. It is found that there are two mineralization enrichment sections along the vertical direction with the depth of - 200 -- 300m and - 500 -- 600m. Central part a- long the strike is the mineralization enrichment part. Thickness and grade of two mineralized zones have different changes along strike and tend.