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黄金科学技术 ›› 2019, Vol. 27 ›› Issue (2): 172-180.doi: 10.11872/j.issn.1005-2518.2019.02.172

• 矿产勘查与资源评价 • 上一篇    

基于三维模型的矿床品位分布规律研究——以陕西龙头沟金矿为例

魏明1(),赵彬1(),王锐1,潘振兴1,曹立国2   

  1. 1. 西北有色地质矿业集团有限公司,陕西 西安 710054
    2. 陕西师范大学地理科学与旅游学院,陕西 西安 710062
  • 收稿日期:2018-06-15 修回日期:2018-12-04 出版日期:2019-04-30 发布日期:2019-04-30
  • 通讯作者: 赵彬 E-mail:xiseweiming@126.com;zbjlu@163.com
  • 作者简介:魏明(1985-),男,陕西乾县人,工程师,从事矿产地质勘查与研究工作。xiseweiming@126.com|赵彬(1984-),男,新疆乌苏人,工程师,从事三维建模与数字矿山建设研究工作。zbjlu@163.com
  • 基金资助:
    中国地质调查局发展中心项目“全国陆域及海区地质图件更新与共享”(编号:DD20190376)和“陕西省山阳县找矿预测”(编号:DD2016005221)

Study on the Distribution of Mineral Grades Based on 3D Model:Taking Shaanxi Longtougou Gold Mine as an Example

Ming WEI1(),Bin ZHAO1(),Rui WANG1,Zhenxing PAN1,Liguo CAO2   

  1. 1. Northwest Nonferrous Geological Mining Group Co. ,Ltd. ,Xi’an 710054,Shaanxi,China
    2. School of Geography and Tourism,Shaanxi Normal University,Xi’an 710062,Shaanxi,China
  • Received:2018-06-15 Revised:2018-12-04 Online:2019-04-30 Published:2019-04-30
  • Contact: Bin ZHAO E-mail:xiseweiming@126.com;zbjlu@163.com

摘要:

以陕西龙头沟金矿为例,通过收集矿山已有的勘查和生产数据,选用Micromine软件平台,并采用普通克里格方法进行插值,建立了矿床的品位矿块模型。在总结矿床地质特征的基础上,从矿化域变异函数拟合参数、矿块模型三维展布及品位分布特征等方面,分析了龙头沟金矿床品位空间分布规律。结果表明:龙头沟金矿床低品位矿基本连续,而高品位矿连续性差;高品位工业矿体在深部倾向延伸方向的连续性好于走向方向。矿化带在55线以东走向延伸和深部倾向延伸均未封闭,且临近EW向与NW向构造交会部位,具有较好的找矿前景,可作为下一步工作靶区。

关键词: 三维地质建模, 块体模型, 变异函数, 地质统计学, 品位分布, 地质特征, 龙头沟金矿, 陕西省

Abstract:

With the continuous integration development of computer technology,three-dimensional modeling technology and geostatistics,the study of geostatistical based on three-dimensional digital model of orebody can reveal the spatial distribution characteristics and mineralization distribution law of orebodies intuitively and accurately,and carry out reserves estimate and dynamic resource management,and effectively guide mineral exploration and development.Longtougou gold deposit discovered in Shaanxi Province is the first gold deposit discovered in the sandstone strata of the south Qinling orogenic belt.It belongs to tectonic altered rock type gold deposit.Based on the existing data,the orebody spatial distribution and mineralization distribution law is analyzed by means of variogram.The specific research process is as follows:Firstly,collect existing topographic survey data,trenching data,drilling sample analysis data and exploration tunnel engineering data,and build a project database with the three-dimensional mining software Micromine as a platform to form a three-dimensional digital model of prospecting engineering.Secondly,combined with geological laws to interpret the profiles,delineate three-dimensional digital model of mineralization domain,and analysis sample data in the mineralized domain model.Thirdly,the block model of mineralization domain is divided according to 7 m×2 m×3 m specification,and the number of sub-blocks is 2×4×3.Fourthly,the variogram fitting is performed on the combined samples in the mineralization domain to determine the variogram structure model and the three-axis direction range.Fifthly,according to the structural law of variation function,the grade of the block model is assigned,so that each block has the grade property of mineralization.The results show that the gold element has a distinct spatial structure,the ratio of strike angle,tendency,and thickness anisotropy are 7.44∶33.37∶1.00.Although the gold mineralization is continuous along the strike,it is mainly low-grade ore continuous,while the high-grade ore has poor continuity.The high-grade industrial orebody in the deep extensional direction is better in continuity than the trend direction,and the high grade mineralization develops,and opens in the east of strike direction.Therefore,the future prospecting should be extended along the eastern side of the orebody and carried out in the deep.The research on the distribution of deposit grade based on the three-dimensional mineralized domain model has certain guiding significance for the exploration and prediction of deposits.

Key words: 3D geological modeling, block model, variogram, geostafistics, grade distribution, geological characteristics, Longtougou gold mine, Shaanxi Province

中图分类号: 

  • P618.51

图1

龙头沟金矿地质简图[14]"

图2

地形及探矿工程三维模型"

表1

数据库表结构"

基本表字段名称字段类型说明

Collar

(工程定位信息表)

HoleID(工程编号)文本型记录工程定位的基本信息
North(北坐标)数值型
East(东坐标)数值型
RL(高程)数值型
TLength(终止深度)数值型
Type(工程类型)文本型

Survey

(工程测量表)

HoleID(工程编号)文本型记录工程位置测量信息
SDepth(测量深度)数值型
Azimuth(真方位角)数值型
Dip(倾角)数值型
Assay(工程样品分析表)HoleID(工程编号)文本型描述工程的采样位置,样品长度,主要元素分析结果
SampID(样品编号)数值型
From(从)数值型
To(至)数值型
SLength(样长)数值型
Au(Au品位)数值型

Lithology

(工程地层岩性表)

HoleID(工程编号)文本型记录岩性分层位置,岩性特征详细描述
From(从)数值型
To(至)数值型
LithCode(岩性代码)数值型
LithName(名称)文本型
LithDisc(描述)文本型

图3

勘探线分布图"

图4

矿化域实体模型"

图5

矿化域块体模型"

图6

金品位走向(a)、倾向(b)和厚度(c)方向实验变异函数曲线及拟合曲线"

表2

3个方向变异函数拟合参数"

三轴方向块Au值变程值/m基台值方位角/(°)倾角/(°)
走向方向0.0335.041.021200
倾向方向0.03157.161.0221057
厚度方向0.034.711.023032

图7

矿化域模型x-y投影图"

图8

矿化域模型x-z投影图"

图9

构造投影图"

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