Abubakar Fahad, Alao Joseph Omeiza, Ogah Arewa James, Ayuba Rufai, Lekdukun Mercy Omojo, Baba Yahaya, Sadiq Fatihu Kabir, Samson Emmanuel Ejiga, Aliyu Abubakar
Department of Geosciences, Confluence University of Science and Technology, Osara, Kogi State, Nigeria.
Department of Physics, Air Force Institute of Technology, Kaduna, Nigeria.
Sci Rep. 2024 Sep 11;14(1):21263. doi: 10.1038/s41598-024-70957-8.
The demand for sustainable development goals and the absence of systematic development and organised exploration for gold has prompted this study to integrate magnetic and radiometric datasets with lithology to evaluate the gold mineralisation potential in the Ilesha schist belt. This study considers 3168.72 km of the Ilesha schist belt in southwestern Nigeria, a frontier belt for gold deposits. The high-resolution airborne magnetic and radiometric datasets were processed using enhancement techniques, including the analytical signal, lineament density, and K/Th ratio. CET grid analysis, Euler deconvolution, and analytical signal depth estimation methods were used to aid the interpretation. The spatial integration and interpolation were performed using the Analytical Hierarchy Process (AHP) and weighted overlay analytical tools within the ArcGIS environment. The dominant structural controls for potential mineralisation are ENE-WSW and ESE-WNW trends. The depth of the magnetic sources revealed by the analytical signal ranged from 63.17 to 629.47 m, while depths ranging from 47.32 to 457.22 m were obtained from Euler deconvolution. The delineated highly magnetic edge sources, dense lineaments, radiometrically highlighted alteration zones, and lithological hosts for gold mineralisation were integrated to establish the gold mineralisation potential map. The AHP deductions reveal that 10.52% of the study site is within the high mineralisation potential class, a remarkable 60.39% falls within the moderate class, a significant portion (28.86%) falls within the poor class, and 0.23% is considered unfavourable. The result was optimised by validation using known mines, with 94% (i.e., 15 out of 16 mining sites) plotting within the high mineralisation potential class. This assessment provides invaluable insight for stakeholders and policymakers to embark on gold exploration and exploitation and promote sustainable mineral development.
对可持续发展目标的需求以及缺乏对黄金的系统开发和有组织的勘探，促使本研究将磁法和放射性测量数据集与岩性相结合，以评估伊莱沙片岩带的金矿化潜力。本研究涵盖了尼日利亚西南部伊莱沙片岩带3168.72公里的区域，该区域是金矿的前沿地带。利用增强技术对高分辨率航空磁法和放射性测量数据集进行了处理，包括分析信号、线性构造密度和钾/钍比值。采用CET网格分析、欧拉反褶积和分析信号深度估计方法辅助解释。在ArcGIS环境中，使用层次分析法（AHP）和加权叠加分析工具进行空间整合和插值。潜在矿化的主要构造控制方向为北东-南西和东南-北西走向。分析信号揭示的磁源深度范围为63.17至629.47米，而欧拉反褶积得到的深度范围为47.32至457.22米。将圈定的高磁性边缘源、密集线性构造、放射性突出显示的蚀变带以及金矿化的岩性宿主整合起来，建立金矿化潜力图。层次分析法的推断结果显示，研究区域内10.52%处于高矿化潜力等级，相当可观的60.39%处于中等等级，很大一部分（28.86%）处于低等级，0.23%被认为不利。通过使用已知矿山进行验证，对结果进行了优化，94%（即16个矿点中的15个）落在高矿化潜力等级内。该评估为利益相关者和政策制定者进行黄金勘探和开发以及促进可持续矿产开发提供了宝贵的见解。
