Helicopter AFMAG (ZTEM) Survey Results over the Ad Duwayhi intrusion related gold deposit (IRGD) in the Western Arabian Shield, KSA

Ad Duwayhi IRGD gold deposit were designed to characterize the deposit signatures. Field data and 2D EM inversion results indicate the Ad Duwayhi intrusive centre features low magnetic susceptibilities and high resistivities that are consistent with the iron-depleted, quartz-sericite-carbonate alteration. Closer inspection of the ZTEM resistivity image suggests that the mineralized breccia zones represent weak resistivity lows within the larger resistive intrusion. The Ad Duwayhi gold porphyry lacks a visible low resistivity alteration halo that distinguishes IRGD’s from porphyry copper deposits. The combined aeromagnetic low and ZTEM resistivity high signatures might allow discrimination of other buried IRGD gold deposits regionally.