<p>This study presents a comprehensive geophysical methodology aimed at identifying subsurface alteration zones and mineralization linked to the Bell porphyry copper-gold deposit situated in British Columbia, Canada. The study involved the acquisition and separate inversion of airborne magnetic, gravity, and time-domain electromagnetic (TDEM) datasets. These inversions produced three distinct models representing magnetic susceptibility, density contrast, and electrical conductivity. Interpretation of these models has revealed spatially distinct physical property anomalies corresponding to potassic, phyllic, and propylitic alteration zones typical of porphyry systems. Notably, the potassic zones were identified by their elevated susceptibility and density, while the phyllic zones demonstrated significant conductivity attributed to the presence of disseminated sulfides. In contrast, the propylitic zones exhibited moderate responses across all datasets. By synthesizing these geophysical findings with existing geological knowledge, a two-dimensional conceptual geological section was developed, effectively correlating alteration zonation with the identified geophysical anomalies. This integrated approach highlights the efficacy of multi-parameter airborne geophysics in refining subsurface characterization for mineral exploration. The resulting geological model not only offers profound insights into the structural aspects of the deposit but also serves as a strategic tool for directing future exploration efforts within the region.</p>

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Geophysical modeling of airborne time domain electromagnetic and potential field magnetic and gravity data to image a polymetallic deposit in Canada

  • Ali Jafarabadi,
  • Maysam Abedi,
  • Ali Moradzadeh

摘要

This study presents a comprehensive geophysical methodology aimed at identifying subsurface alteration zones and mineralization linked to the Bell porphyry copper-gold deposit situated in British Columbia, Canada. The study involved the acquisition and separate inversion of airborne magnetic, gravity, and time-domain electromagnetic (TDEM) datasets. These inversions produced three distinct models representing magnetic susceptibility, density contrast, and electrical conductivity. Interpretation of these models has revealed spatially distinct physical property anomalies corresponding to potassic, phyllic, and propylitic alteration zones typical of porphyry systems. Notably, the potassic zones were identified by their elevated susceptibility and density, while the phyllic zones demonstrated significant conductivity attributed to the presence of disseminated sulfides. In contrast, the propylitic zones exhibited moderate responses across all datasets. By synthesizing these geophysical findings with existing geological knowledge, a two-dimensional conceptual geological section was developed, effectively correlating alteration zonation with the identified geophysical anomalies. This integrated approach highlights the efficacy of multi-parameter airborne geophysics in refining subsurface characterization for mineral exploration. The resulting geological model not only offers profound insights into the structural aspects of the deposit but also serves as a strategic tool for directing future exploration efforts within the region.