Mining activity is responsible for the deterioration of the vegetation environment, and the variation

of vegetation environment reflects the information of mining area expansion. With the Panzhihua vanadium-titanium

magnetite ore deposit area as a study case, the authors extracted the mining area expansion information by using

the SARVI difference model and then used the supervised cassification method. The results of the two performances

were superimposed upon each other and analyzed under the condition of ArcView 9.1 so as to obtain the dynamic

information of mining area expansion. A comparison was made with the manual interpretation classification result

of seasoned expert in 2005, and it is shown that the precision can reach 95.3%. The experimental results show that

this method is very simple and effective in the extraction of the mining area expanding information, and is also

very important both in theory and in practice. This method proves to be very promising in dynamic inspection of

mining area.