The application of comprehensive geological information of remote sensing and metallogenic model to the prognosis of porphyry copper-gold deposits in Papua New Guinea

In recent years, the Southwest Pacific area, especially Papua New Guinea, has already become one of the hot spots in the worldwide search for copper-gold deposits. Several world-class large gold deposits and large copper-gold deposits have been found. By using remote sensing and GIS technology, the authors extracted the alteration information and geological information of linear-ciccular structure, lithology and strata in the study area, analyzed and built up the metallogenic prognostic units. Based on the correlative spectral information between ETM+ data and the alteration mineral combination, the authors extracted remote sensing alteration and abnormal information for the prognostic units by ratio and PCA methods. In combination with the volcanic island arc and arc-continental collision zone as well as other special geological tectonic environments in Papua New Guinea, the indicators for ore deposits and the metallogenic model were analyzed and established. On such a basis, the authors delineated prognostic prospective areas at three levels, which include four grade 1 areas，four grade 2 areas and two grade 3 areas.