DELINEATING PERMISSIVE ORE-FINDING AREA AND PREFERABLE ORE-FINDING AREA BY GIS: AN EXAMPLE FROM THE PREDICTION OF COPPER DEPOSITS IN YUANJIANG AREA, YUNNAN PROVINCE
Chi Shundu Zhao Pengda (The Open Laboratory of Quantitative Prediction and Exploration Assessment of Mineral Resources, MGMR, Wuhan430074)
An approach is made for finding geological anomaly and delineating “5P”area by the application of geographic information system (GIS), with the predicting of Dahongshan-type copper deposits as its practical example. Based on the analysis of prospecting favourability of various anomalies, permissive ore-finding area and preferable ore-finding area can be delineated by the following steps: (1) establishing a spatial model for ore-forming prediction; (2) delineating the permissive ore-finding area; (3) determining the compound anomalies and numerical range indicating preferable ore-finding area and its weight; (4) congregating all the selected anomalies and making congruent map; (5) determining unifying criterion of preferable ore-finding area on various scales and (6) delineating preferable ore-finding area. Finally, the prediction results of Dahongshan-type copper deposits are evaluated.