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Gold Science and Technology ›› 2021, Vol. 29 ›› Issue (5): 647-657.doi: 10.11872/j.issn.1005-2518.2021.05.030

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

A Semi-automatic Method for Estimation of Solid Mineral Resources Reserves

Haiquan LI()   

  1. Beijing Sinomine Smartech Inc. ，Beijing 100043，China
  • Received:2021-02-23 Revised:2021-08-25 Online:2021-10-31 Published:2021-12-17

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Abstract:

With the popularization and application of Surpac and other 3D mining software，more and more exploration projects use 3D mining software to prepare the estimation reports of solid mineral resources. Although the solid mineral resource estimation report compiled with 3D mining software is much faster than the traditional 2D method of resource reserve estimation to some extent，it also faces the problem of manual operation steps，inconsistent estimation process，and difficult matching between estimation results and specification requirements. In order to improve the calculation efficiency and make the results meet the specification requirements，a semi-automatic method for solid mineral resource estimation has been developed in compliance with “Regulations of Solid Mineral Resources Estimation”. The development of this semi-automatic resource estimation method has been based on the secondary development technology which is provided by Surpac software. This new method has been developed by summarizing，from various geological exploration projects，the layouts of different types of exploration test locations as well as the characteristics and spatial distribution of the orebody. From this work，a set of instance data that can cover various exploration situations was then prepared as the objects of research. This new method is combined with the characteristics of the Resource Estimation Report prepared by Surpac 3D mining software，it has developed a technical process of mineral resource estimation using 3D mining software and in accordance with the specification requirements. Through computer programming，most of the operations in the process can be implemented by the developed program. Except for cross section interpretation and solid modeling which still needs manual operation，all of the other steps including entry of raw data，establishment of geological database，statistics of mineral grade，process of especially high mineral grade，estimation and validation of the block models，mineral resource estimation reporting，generating drawings and so on can be carried out using the automatic procedures. Therefore，the overall work for estimation of solid mineral resources has reached a degree of semi-automation.The three-dimensional resource and reserve estimation of Bayan Baolege silver-polymetallic ore in Alu Kerqinqi of Inner Mongolia Autonomous Region is completed by the semi-automatic method.Dozens of silver and zinc orebodies are interpreted，the statistical summary of geological characteristics，resource estimation report and drawings of all mineral bodies are automatically completed，and the drawing of 36 geological section profiles，10 horizontal section drawings and 12 vertical longitudinal projection drawings in the mining area are completed automatically within 1/2 days. The geological block method is used to caculate and verify the No.1 main orebody. The relative deviation of the estimation results of the two methods is within a reasonable range. The estimation results show that the results are reliable and meet the specification requirements.The estimation time is greatly reduced，significantly improving the estimation work efficiency and creating good economic benefits.

Key words: estimation of solid mineral resources reserves, Surpac software, secondary development, semi-automatic estimation method, silver polymetallic ore, Inner Mongolia

CLC Number: 

  • P624.7

Fig.1

Diagram of Surpac string data structure"

Fig.2

Flow chart of resource and reserve estimation"

Fig.3

Diagram of raw data entry template"

Table 1

Overall assignment table of section interpretation string number and solid number"

线串编号或实体编号范围地质信息
102，32000，100地层
103，32000，100岩体
104，32000，100脉岩
105，32000，100正断层
106，32000，100逆断层
109，32000，100蚀变岩
110，32000，100矿体

Fig.4

Schematic diagram of ore-controlling points on the center surface of orebody"

Fig.5

Schematic diagram of three-dimension space points fitting plane"

Fig.6

Schematic diagram of triangular extension formed by the ore-controlling center points of the orebody"

Fig.7

Schematic diagram of dynamic estimation for block model"

Fig.8

Schematic diagram of extension range line of exploration lines"

Fig.9

Schematic diagram of solid of resource quantity classification"

Fig.10

Logarithmic probability diagram of grade of No.1 silver orebody in Bayanbaolege mine"

Fig.11

Statistical parameters of ultra-high grade treatment for No.1 silver orebody in Bayanbaolege mine"

Table 2

Results of resource reserves estimation for No.1 silver orebody in Bayanbaolege mine （distance power inverse ratio method）"

资源量类型矿石体积 /m3平均体积质量 /（t·m-3）矿石量 /104t平均品位 /（×10-6）金属量 /t
合计5610162.91163.3149.21243
探明资源量3183752.9192.6146.80136
控制资源量1342032.9139.1154.7860
推断资源量1084382.9131.6149.4247

Fig.12

Comparison diagram of average grade between composite samples and block models of silver zone in Bayanbaolege mine"

Table 3

Results of resource reserves estimation for No. 1 silver orebody in Bayanbaolege mine（geological block method）"

资源量类型面积/m2平均厚度/m体积/m3平均体积质量/（t·m-3）矿石量/（104t）平均品位/（×10-6）金属量/t
合计116 9145.11597 8002.91174.7150.00261
探明资源量47 9246.87329 0692.9196.5152.63146
控制资源量33 6003.98133 7922.9138.9155.7361
推断资源量35 3903.81134 9392.9139.3137.7154
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