۳D Modelling and Feasibility Assessment of Granite Deposit using ۲D Electrical Resistivity Tomography, Borehole, and Unmanned Aerial Vehicle Survey

This research work aims to critically analyze the efficacy of inexpensive and rapid ۲D electrical resistivity tomography (۲D ERT) survey for sub-surface geological delineation of granite deposits. The research work involves six ERT profiles using the Schlumberger protocol with an inner and outer electrode spacing of ۵ m and ۱۰ m, respectively. In addition, the unmanned aerial vehicle (UAV) survey is also performed to obtain the terrain information of the studied area. At the same time, a few boreholes are drilled to validate the ۲D ERT interpretations. The ۲D ERT survey reveals that strong resistivity contrast enables inverted resistivity imaging to characterize the deposit such as topsoil (۱۰۰-۸۰۰ Ωm), fracture granite (۸۰۰-۲۳۰۰ Ωm), and solid granite (> ۲۳۰۰ Ωm). The results obtained from UAV, ۲DERT, and borehole survey are further processed to estimate the bedrock to topsoil ratio to assess the feasibility of the deposit. The bedrock to topsoil ratio, estimated by ۲D ERT and borehole, is ۳.۲ and ۲.۲, respectively. At the same time, the combined UAV, ۲D ERT, and borehole survey calculates the bedrock volume ۳.۲ times to topsoil. Thus the research work allows us to conclude that ۲D ERT is an inexpensive, viable, and efficient technique for sub-surface geological documentation, and helps select appropriate mining methods.

کلیدواژه ها:

Electrical resistivity imaging ، Borehole survey ، Topographic survey ، Granite geological characterization ، feasibility assessment