**SUMMARY**

**Study the model of
structural function for evaluation of the change of copper content,**

** contributing to the orientation of the
exploration: A case study Sin Quyền copper deposit, Lào Cai**

*Trương Xuân Luận, Trương Xuân Quang, ^{
}Nguyễn Tuấn Anh, Nguyễn Chí Công, Nguyễn
Thị Hải Yến*

This paper
introduces the study results of the structural function model for comprehensive
evaluation of three-dimensional change of copper content at Sin Quyền
mine. The results indicated that: Based on the Open
Source Software SgeMS, authors have already developed a set of Geostatistical
Software Tool for calculating and modeling spatial structural function model by
using the five most common models:
spherical, exponential, Gausian, linear and pure nugget effect. The model has
been successfully applied for ore-bodies, which have nearly vertical dip,
complicated variation; exploration works in the study area are bending, deviating boreholes with different azimuth. The main
exploration lines direction determined by using the structural function model
is North-South. These lines sometimes parallel/not parallel to each other or
are none-linear. The density of exploration network for mineral reserves of
grades 121 and 122 are [(40x30)±5 m] and [(75x60)±10 m], respectively.

*Keywords:** **model of structural function**, copper deposit,
Sin Quyền - Lào**
Cai*