Geophysical survey of the Khachovi gold-polymetallic ore occurrence (Adjara-Trialeti folded zone, Georgia)

Abstract

This article presents the findings of a geophysical survey conducted on the Khachkovi gold-polymetallic occurrence in Georgia. The study aimed to evaluate the geological prospects through comprehensive investigations. Three methods – electrometry, magnetometry, and gamma spectrometry – were employed in the survey, covering approximately 3.5 square kilometres. Analysis of the survey data revealed high magnetic field anomalies and variations in the gravity field, indicating gabbro-diorite intrusive bodies at depth. The Khachkovi occurrence was structurally associated with faults, fractured zones, and hydrothermally altered zones. Electrically conductive minerals within the hydrothermally altered zones were confirmed through induced polarization values and anomalous potassium content. The study area exhibited low potassium, thorium, and uranium levels, potentially due to Quaternary sediments and weak alterations. Hydrothermally altered sulfide mineral-containing zones were primarily linked to fault zones, intrusive bodies, and brecciated zones. The surface hydrothermally altered zone consisted mainly of pyrite-bearing rocks. The geophysical survey provided valuable insights into the geological characteristics and prospects of the Khachkovi gold-polymetallic occurrence, offering guidance for further exploration activities. These findings contribute to understanding the mineralization potential and future mining efforts.