This is an excerpt from one of the latest mineral survey reports developed by our partner. The full report, including graphics and data, is 50 pages long. Specific names were redacted due to the sensitive nature of the survey.
Large-scale aerial geophysical surveys using unmanned aerial vehicles (UAVs), including aeromagnetic and aero gamma-spectrometric surveys, were conducted for the first time in this particular area several years ago. However, the results were underwhelming and a new survey had to be conducted.
Using modern aerial geophysical technology (UAV survey), the new survey provided new information about the AREA's geological structure. Interestingly, a standard comprehensive aerial geophysical survey was previously conducted by helicopter in the surrounding territory in 2020-2021. Comparing the materials from the two surveys of different scales allows for assessing their resolution capability and effectiveness for geological mapping. The 1:5000-1:10000 scale UAV survey consistently exhibits higher spatial resolution and enables the identification of significant geological features with the necessary level of detail.
The results of the aero gamma-spectrometric survey with UAVs deserve separate positive evaluations. Despite the small detector size and consequently low number of gamma quanta detected during movement in the uranium and thorium ranges, a local radiometric anomaly previously identified by predecessors was registered. The gamma field in the potassium range is most reliably detected. The patterns in the distribution of equivalent radiation energy in rocks, revealed through the UAV-based aerial gamma-spectrometry, qualitatively correspond to the patterns identified using large-volume detectors in helicopter surveys. Therefore, UAV-based aerial gamma-spectrometry can be recommended for further detailed studies of the land mass structure and to identify areas enriched with calcite and high gross potassium oxide content.
The AREA's geological structure turned out to be much more complex than previously assumed. Numerous bodies of alkaline syenites, gabbroids, and large fractures intersect the limestone, marble, and dolomite carbonate sequence. The degree of disruption and intensity of superimposed changes increase in the northern direction toward contact with another LAND MASS. Based on this, it can be assumed that the chemically purest limestones are located in the southern part of the area along the left bank of the RIVER.
It should be noted that conducting aerial geophysical surveys in challenging landscape and weather conditions would have been impossible without the assistance of Microavia. This company developed a highly reliable quadcopter with excellent technical characteristics and provided an experienced UAV operator, Max. Special thanks are also due to the geologists and employees of COMPANY, represented by Alex, for their comprehensive support and assistance in organizing the work.