Abstract
The Sonakhan greenstone belt in Central India is under-explored with respect to gold in spite of its similarity to auriferous greenstone belts in general, which prompted a prospectivity analysis. The workflow involved adoption of a conceptual mineral systems model, recognizing indicative spatial proxies, processing exploration datasets, generating evidence maps and integrating into GIS-based mineral prospectivity mapping. Available geological information such as key lithologic units and their contacts was combined with geochemical anomalies of selected pathfinder elements, geophysical data (aeromagnetic anomaly and K/Th ratio map) and satellite digital image data (ASTER and Landsat 7 ETM +), leading to generation of 17 evidential layers. The lack of a significant number of known mineral occurrences in the study area precludes the use of data-driven prospectivity modeling techniques. Therefore, knowledge-driven approaches such as binary and multiclass index overlay, fuzzy logic and fuzzy AHP (analytic hierarchy process) were adopted to integrate the evidential layers resulting in four prospectivity maps. The variation of cumulative prospectivity with respect to cumulative area in each model was used to determine threshold to produce binary prospectivity maps separating high and low prospectivity zones. An approach based on the unique conditions of the binary prospectivity maps was used to illustrate the combined results of different models. In order to quantify the intuitive uncertainty in exploration targeting that arose due to different model outputs, a modulated predictive model was generated taking the mean prospectivity values at each pixel. The pixels having mean values above 95th percentile were grouped and the area delineated as potential exploration targets for gold that comprises merely 5% of the study area. The estimated uncertainty and confidence values for each pixel were used in the risk analysis that returned 1.95% and 3.05% of the study area as low- and high-risk exploration targets, respectively.
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Acknowledgments
The authors gratefully acknowledge the Geological Survey of India (GSI) for providing access to the stream sediment geochemical data required for this research. We also acknowledge the USGS EROS data center for providing the ASTER and Landsat ETM+ data used in this research. The authors are also thankful to the Atomic Minerals Directorate for Exploration and Research of the Department of Atomic Energy, Government of India, and Sridhar et al. (2015) whose airborne geophysical survey results have been used in this study. ESRI India is also acknowledged for providing the geospatial software such as ArcGIS, ENVI that are utilized during the preparation of this manuscript. We gratefully acknowledge Mohammad Parsa and an anonymous reviewer for their constructive comments which have helped us in improving the quality of our work and presentation significantly.
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Appendix A: Pairwise Comparison Matrices for Fuzzy AHP
Appendix A: Pairwise Comparison Matrices for Fuzzy AHP
A detailed discussion on the steps for applying fuzzy AHP method along with the associated equations can be found in Behera et al. (2019). Interested readers are referred to Saaty (1977), Chang (1996), Brunnelli (2014) and Enrique Mu (2017). In the following section, the pairwise comparison matrices (PCMs) have been given for geological, geochemical and geophysical and satellite image processing results (Table 8). Three different sets of judgements on the relative importance of each input evidence layers were incorporated in the analysis. Saaty's nine-point pairwise comparison scale was used to quantify the relative preferences of the alternatives in pairwise comparison matrices (PCMs). The consistency ratios (CRs) for the PCMs were calculated using Super Decisions V3, a freely available software developed by the Creative Decisions Foundation and it was ensured that all the CRs are less than 0.10 which approves the plausibility of the quantified subjective judgements used in this study. The triangular fuzzy numbers (TFN), fuzzy synthetic extents, priority vectors and normalized weight vectors were calculated using the respective equations (Behera et al., 2019). Finally, the corresponding weights for criteria and alternatives were derived (Table 7 in the manuscript) and used for gold prospectivity mapping.
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9.
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Behera, S., Panigrahi, M.K. Gold Prospectivity Mapping in the Sonakhan Greenstone Belt, Central India: A Knowledge-Driven Guide for Target Delineation in a Region of Low Exploration Maturity. Nat Resour Res 30, 4009–4045 (2021). https://doi.org/10.1007/s11053-021-09962-x
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DOI: https://doi.org/10.1007/s11053-021-09962-x