Abstract
Based on the Landsat 8 OLI image, hydroxyl and the concomitant ferrous alterations in and around the Dexing porphyry polymetal deposit were preliminarily delineated by the fractal summation model, and the false anomalies therein unrelated to ore were successfully eliminated by the hot-spot analysis that can quantitatively reflect the clustering degree of the anomaly patches. Sequentially, the ratio vegetation index anomalies related partly to the mine exploitation were also delineated, and they closely edge the mining zones, namely the alteration anomaly patches. Finally, the field spectral survey for near-ore vegetation was conducted, and several lines of evidence showed that the ecological degradation surrounding the Dexing ore fields appears to be more severe and extensive than its counterparts miles away. A holistic remote-sensing schema for regional ore prospecting and associated environmental evaluation was put forward and we believe that the elimination of false anomalies may be more important than extraction of true anomaly in this carefully researched ore-district.
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