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Recognition of Significant Surface Soil Geochemical Anomalies Via Weighted 3D Shortest-Distance Field of Subsurface Orebodies: A Case Study in the Hongtoushan Copper Mine, NE China

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Abstract

Quantitative prediction of concealed mineralization is always confronted with difficulties in comprehensive analysis between 2D and 3D data and between qualitative and quantitative data. A weighted shortest-distance field method is proposed here to track, in 3D heterogeneous space, the shortest migration paths of ore-forming elements from an orebody to the ground surface, assuming that ore-forming elements migrate at less costs into fault rupture zones than in other surrounding rocks. This method was used to generate the weighted shortest-distance field of the 3D orebody model in the Hongtoushan copper mine, NE China. In addition, the field value and the geochemical soil survey data on the Earth’s surface were subjected to statistical analysis. Results showed that some geochemical anomalies are characterized by the shortest-distance field of the known orebodies, while other formerly unrecognized anomalies may possibly be related to undiscovered orebodies. This method can also be applied to comprehensive statistical analysis between a 3D geological model and 2D data on the Earth’s surface, e.g., geophysical exploration or remote sensing data.

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Acknowledgments

This study was supported by grants from the National Key Research and Development Program of China (No. 2017YFC0601503) and the National Natural Science Foundation of China (No. 41772348). The Co-Construction MapGIS® Library by Engineering Research Center for Geographic Information System of China and Central South University provided MapGIS® software for this study. We also thank Mr. Changyan Shi, the deputy general manager of China Nonferrous Hongtoushan Fushun Mining Group Co., Ltd, and Mr. Tiejun Yang, the deputy dean of Institute of Geology Exploration of 101 Team of The Bureau of Non-Ferrous Geology of Liaoning Province, for their meticulous arrangements and kind assistances in the works of data collection and tunnel investigation. Dr. John Carranza, the Editor-in-Chief, Dr. Yue Liu form Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, and another anonymous reviewer are thanked for their positive comments, which significantly helped to improve the initial manuscript.

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Correspondence to Baoyi Zhang.

Appendices

Appendix 1: Pseudocode of Weighted Shortest-Distance Field-Generating Algorithm for 3D Heterogeneous Space

figure a

Appendix 2: Pseudocode of Weighted Shortest Path Backtracking Algorithm from Any Voxel to the Source Voxel-Set

figure b

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Wang, L., Wu, X., Zhang, B. et al. Recognition of Significant Surface Soil Geochemical Anomalies Via Weighted 3D Shortest-Distance Field of Subsurface Orebodies: A Case Study in the Hongtoushan Copper Mine, NE China. Nat Resour Res 28, 587–607 (2019). https://doi.org/10.1007/s11053-018-9410-7

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