It is the key for locating mineralized area with remote sensing technique to analyze the metallogenic geological environment and remote sensing information. It is very difficult to explore mineral resources in the high mountains where covered with glacier and snow. Through analysis of the geological setting

metallogenic environment and metallogenic marks

it has been well aware that the preferential target for remote sensing exploration is the hydrothermal vein type ore deposit which is located in the outer or inner contact zones of granite or granodiorite intrusion controlled by faults. The technique of Masking and Principal Component Analysis （MPCA） has been used to process the Landsat TM data

and the glacier and snow are masked. The MPCA 3

5

6 composite imagery shows the anomalous tone of limonnite and silicic alteration and the circular feature of granodiorite intrusive rock as well as the lens like structure in south of the circular image. The processed TM imagery has delineated the target for field investigation. At last

the Luobugaizigou polymetallic mineralized area is found.