Mapping of alteration minerals and prospecting potential analysis of Pulang porphyry copper deposit： Evidence from remote sensing data of Ziyuan-1 02D satellite

With the large-scale mining of the Pulang porphyry copper deposit, which has made an important breakthrough in prospecting in recent years, it is urgent to find further potential resource in the peripheral of the first mining area. Hyperspectral remote sensing technology, especially the successful launch of domestic satellite ZY1-02D hyperspectral satellite, makes it possible to quickly and accurately identify altered minerals related to mineralization in the areas with high altitude and difficult topographic conditions. In view of the inadequate effectiveness of previous hyperspectral mineral identification methods in vegetation areas, this paper selects Pulang mining area as the research area and uses the ZY1-02D hyperspectral remote sensing data to obtain the information of the alteration minerals such as sericite, chlorite and epidote based on the measured spectra. Through the ratio vegetation index, the study area is divided in to vegetation areas and non-vegetation areas, then the corresponding spectra of the alteration minerals are constructed respectively. At the same time, the hyperspectral altered mineral mapping method of Pulang porphyry copper mining area is optimized and established by using the matched filtering method. The field investigation results show that the optimized hierarchical ZY1-02D hyperspectral altered mineral mapping method, which distinguishes vegetation area and non-vegetation area, can effectively detect the alteration characteristic mineral information in the periphery of Pulang porphyry copper mining area, especially in the vegetation covered area on the east side of the first mining area. The field data further reveals that the east part of Pulang first mining area has great prospecting potential.