Wavelet Multi-Scale Decomposition of Magnetic Anomaly and Its Application in Searching for Deep-Buried Minerals in Crisis Mines: A Case Study from Daye Iron Mines

The shallow iron ores of Daye mines are exhausted after years of exploration and mining. In order to search for deep-buried ores, the wavelet multi-scale analysis method was employed to decompose the magnetic anomaly into different scales and further explain the deep-buried unknown ore body through the combination of spectrum analysis. Theoretical modeling indicates that this method is superior to ordinary approaches such as analytical continuation, higher order derivatives, matched filter and so on. Magnetic data processing and interpretation of the Daye iron mines show that there is no large-scale iron ore below the depth of 1 000 m at its western part (Jianlinshan, Longdong and Tiemenkan), for the residual magnetic anomaly is not present in its five order wavelet approximation map. On the contrary, the residual anomaly still exists in the five order wavelet approximation map of the eastern mines (Jianshan, Litoushan), indicating the possible existence of iron ores at the depth of 1 000 m, which needs to be further researched.