Research On Dynamic Reserve Calculation Of Metal Mines Based On 3D Geological Models

Mineral Resource is one of the nonrenewable resources. With the increasing requirement of mineral resources at home and abroad and gradually decreasing of global mineral resources, protection and development of mineral resources become an important topic of the related departments. The rapid development of Geographical Information Systems (GIS) is tremendously significant to the enhancement of geological and mineral resource prospecting, the reserving estimation of the mineral resources, and the, automatic and intelligent management. The applications of GIS and 3D based geological modeling and visualization in mineral resources and the calculating of mineral reserves are important directions of reserving computation and management.This study aims to establish a data model of dynamic reserves management and a new organization and management way of metal mine. The paper studies on the technology of three-dimensional based dynamic modeling, exploring the dynamic calculation of metal mine reserves and developing the prototype system of metal reserves dynamic computing which is the basic of dynamic reserves and management of mineral resources.This study is mainly based on three-dimensional geological modeling, reserve calculation methods and the development of existing three-dimensional geological modeling software and reserve calculation software at home and abroad. The paper presents a new method by using the geology of ore deposit, GIS, graphical image map processing, geology statistical methods and prototype methods to estimating the mineral resources. The field work data of Nanjing Mei Mountain iron mines is used to test the method.According to spatial distribution of metal deposits, this paper presents a new modeling method named "surface to three-dimensional". The paper puts the control point fractionation method and midline connection method to achieve ore bodies' contour lines to find the best connect method with human intervention. Moreover, the modeling of surfaces system calculus of interpolation can make a series of control point, then rebuilt the surface model to make the result smooth, beauty and correspond to the actual needs. With the problem of how to divide the cube of the surface, this paper proposes the orthographic projection arithmetic of switching method to solve the radial surface of triangle. We translated the point from 3D to the surface, and the problem is solved.In view of the request of the dynamic computation of the metal ore deposit reserves the paper proposed a method of partial dynamic restructuring and reserves dynamic computing for three-dimensional ore model. During mining, we can find a point of the ore body from a new exploratory bore-hole, and judge the area of this point. So the model can be dynamical rebuilt, including the surface and inside of ore body. By recalculating the local volume quality based on sample data, the influence area of sample data can be automatically computed. After the influenced volumes' quantity is calculated, these volumes'quality is recalculated automatically. We use the Boolean operation and put these data into the new model. After calculating we choose the triangle surfaces that belong to the ore body, and the speed of calculation can also be improved.We analyzed the functional components of "based on the three dimensional geological model metal ore deposit dynamic holdup computing system", developed the framework of prototype system based on VC++ and dot net framework. This prototype system is successful in achieving partial dynamic reconstruction, initial reserves computing and dynamic reserves computing of three-dimensional model of ore body.This model not only can calculate the initial reserves, but also can be used in the actual mining practice. The model can be used to calculate the reserves according to the real-time information, decrease the risk, and help the department in charge of the exploring the mineral resources to Monitor and control the Mine Exploitation. Meanwhile, the paper lays a good foundation of the "metal reserves dynamic management system".