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. Mineral exploration in the West Greenland flood basalt province isattractive because of its resemblance to the magmatic sulfide-rich depositin the Russian Norilsk region, but it is challenged by rugged topography andpartly poor exposure for relevant geologic formations. On northern DiskoIsland, previous exploration efforts have identified rare native ironoccurrences and a high potential for Ni–Cu–Co–PGE–Au mineralization.However, Quaternary landslide activity has obliterated rock exposure in manyplaces at lower elevations. To augment prospecting field work under thesechallenging conditions, we acquire high-resolution magnetic andmultispectral remote sensing data using drones in the Qullissat area. Fromthe data, we generate a detailed 3D model of a mineralized basalt unit,belonging to the Asuk Member of the Palaeocene Vaigat Formation. Different types of legacy data and newly acquired geo- and petrophysical aswell as geochemical-mineralogical measurements form the basis of anintegrated geological interpretation of the unoccupied aerial system (UAS)surveys. In this context, magnetic data aim to define the location and theshape of the buried magmatic body, and to estimate if its magneticproperties are indicative for mineralization. UAS-based multispectralorthomosaics are used to identify surficial iron staining, which serves as aproxy for outcropping sulfide mineralization. In addition, UAS-baseddigital surface models are created for geomorphological characterization ofthe landscape to accurately reveal landslide features. UAS-based magnetic data suggest that the targeted magmatic unit ischaracterized by a pattern of distinct positive and negative magneticanomalies. We apply a 3D magnetization vector inversion (MVI) model to theUAS-based magnetic data to estimate the magnetic properties and shape of themagmatic body. By means of introducing constraints in the inversion, (1) UAS-based multispectral data and legacy drill cores are used to assignsignificant magnetic properties to areas that are associated with themineralized Asuk Member, and (2) the Earth's magnetic and the palaeomagneticfield directions are used to evaluate the general magnetization direction inthe magmatic units. Our results suggest that the geometry of the mineralized target can beestimated as a horizontal sheet of constant thickness, and that themagnetization of the unit has a strong remanent component formed during aperiod of Earth's magnetic field reversal. The magnetization values obtainedin the MVI are in a similar range to the measured ones from a drillcoreintersecting the targeted unit. Both the magnetics and topography confirmthat parts of the target unit were displaced by landslides. We identifiedseveral fully detached and presumably rotated blocks in the obtained model.The model highlights magnetic anomalies that correspond to zones ofmineralization and is used to identify outcrops for sampling. Our studydemonstrates the potential and efficiency of using high-resolution UAS-basedmulti-sensor data to constrain the geometry of partially exposed geologicalunits and assist exploration targeting in difficult or poorly exposedterrain.

Drone-based magnetic and multispectral surveys to develop a 3D model for mineral exploration at Qullissat, Disko Island, Greenland