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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (2): 172-180.doi: 10.11872/j.issn.1005-2518.2019.02.172

• Mineral Exploration and Resource Evaluation • Previous Articles    

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

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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

CLC Number: 

  • P618.51

Fig.1

Geological sketch of Longtougou gold deposit"

Fig.2

Three-dimensional model of terrain and exploration engineering"

Table1

Structure of database table"

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

Fig.3

Distribution map of exploration line"

Fig.4

Entity model of mineralization domain"

Fig.5

Bulk model of mineralization domain"

Fig.6

Variation function curve and fitting curve of gold grade strike （a）,dip （b） and thickness （c） orientation experiment"

Table 2

Three-direction variogram fitting parameters"

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

Fig.7

x-y projection map of mineralization domain model"

Fig.8

x-z projection map of mineralization domain model"

Fig.9

Projection map of structural"

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