Development of a methodology and an optimal complex of geophysical studies when identifying ore gold promising areas within Kaspinsky ore cluster

The article presents the application results of a set of geophysical methods to study the Kaspinsky ore cluster in the Krasnoyarsk Krai. The purpose of the study was to evaluate the efficiency of various modern methods when solving the problem of identifying the boundaries of intrusive massifs and analyzing tectonic disturbances that play a key role in the formation of gold-sulfide-quartz mineralization. The geophysical complex included unmanned magnetic exploration (SibGIS UAS complex), non-contact electric field measurement (BIKS non-contact measurement of electric field hardware complex) and electromagnetic sensing with induced polarization (Mars hardware and software complex). Magnetic exploration allowed to identify small diorite massifs of the Olkhovsky complex and their contacts with carbonate deposits, as well as to identify tectonic faults. Electrical exploration contributed to the analysis of small faults and distribution of induced polarization, which is important when searching for mineralization zones. Also, the study included a three-dimensional cascade inversion of magnetic exploration data for intrusive body localization. Conducted work resulted in the conclusion that the presented methodology is not optimal and the complex of geophysical methods is redundant. It is proposed to exclude the method of non-contact measurement of electric fields in further researches due to the small amount of useful information and interpretation problems as compared with the method of electromagnetic sensing and induced polarization. In addition, the main change in the methodology is the sequence of work stages. The data obtained as a result of the conducted research served as one of the bases for setting up drilling operations at the exploration stage.

1. Erofeev L.Ya., Orekhov A.N. Geological and geophysical conditions at Siberian golden ore fields. Bulletin of the Tomsk Polytechnic University. 2014;324(1):80-86. (In Russ.). EDN: RWQLIZ.

2. Gusev A.I. Geological and genetic model of the Sinyukhinsky gold-copper-skarn deposit. In: Poiski i razvedka mestorozhdenii poleznykh iskopaemykh: materialy nauch. konf. = Prospecting and exploration of mineral deposits: Proceedings of the scientific conference. Tomsk: Tomsk Polytechnic University; 2000, p. 104-108. (In Russ.).

3. Soloviev G.A. Petrophysical classification of ore deposits. Geologiya i razvedka. 1991;6:22-29. (In Russ.).

4. Erofeev L.Ya., Orekhov A.N. Magnetogeological models of gold ore bodies and magnetometry potential in their exploration. In: Minerageniya Severo-Vostochnoi Azii: materialy II Vseross. nauch.-prakt. konf. = Minerageny of North-East Asia: proceedings of the 2nd All-Russian scientific and practical conference. Ulan-Ude: Ekos; 2011, p. 46-47. (In Russ.).

5. Prikhod’ko A.Yu. Formation conditions of gold ore deposits according to geophysical data. In: Geofizicheskie issledovaniya na tverdye poleznye iskopaemye: tezisy dokladov Mezhdunar. geofizicheskoi konf. = Geophysical research for solid minerals: abstracts of the International geophysical conference. 2–6 October 2006, St. Petersburg. St. Petersburg: Izdatel’stvo Welcome; 2006, p. 284-285. (In Russ.).

6. Chuprov V.V., et al. Geological and geophysical classification of ore objects in general and detailed exploration. Sovetskaya geologiya. 1982;4:24-28. (In Russ.).

7. Parshin A.V., Bydyak A.E., Blinov A.V., Kosterev A.N., Morozov V.A., Mikhalev A.O., et al. Low-altitude unmanned aeromagnetic survey in management of large-scale structuralgeological mapping and prospecting for ore deposits in composite topography. Part 2. Geografia i prirodnye resursy. 2016;S6:150-155. (In Russ.). https://doi.org/10.21782/GIPR0206-1619-2016-6(150-155). EDN: XQRZBR.

8. Parshin A.V., Grebenkin N.A., Morozov V.A., Rzhevskaya A.K., Shikalenko F.N. The first results of methodological work on the application of bespilot airborne geophysical technologies at the stage of prospecting of uranium deposits. Prospect and protection of mineral resources. 2017;11:59-64. (In Russ.). EDN: YTHJUE.

9. Snegirev N.V., Gachenko S.V., Parshin A.V. Comparative analysis of low-altitude magnetic survey sensitivity using unmanned aerial vehicles and land magnetic survey. Earth sciences and subsoil use. 2023;46(2):182-189. (In Russ.). https://doi.org/10.21285/2686-9993-2023-46-2-182-189. EDN: CLAMAG.

10. Sapunov V.A., Denisov A.Y., Savelyev V.V., Kiselev S.E., Narkhov E.D., Sergeev A.V., et al. Modernization of ground-based overhauser POS magnetometers to use on small unmanned copter-type aerial vehicles. In: Inzhenernaya i rudnaya geofizika 2020: materialy 16-i nauch.-prakt. konf. sovmestno s seminarom «Inzhenernaya i rudnaya geologiya 2020» = Engineering and ore geophysics 2020: proceedings of the 16th scientific and practical conference in combination with the seminar “Engineering and Ore Geology 2020”. 14–18 September 2020, Perm. Perm: Geomodel; 2020, р. 99. (In Russ.). https://doi.org/10.3997/2214-4609.202051124. EDN: DQTTXQ.

11. Sapunov V., Bondarev E., Denisov A., Narkhov E., Sergeev A., Fedorov A., et al. UAV overhauser sensors and magnetometers: results and development prospects. In: Rocha Á., Vaseashta A. (eds). Developments and Advances in Defense and Security. Proceedings of MICRADS 2024. Springer; 2025, vol. 423, p. 331-345.

12. Parshin A.V., Tsirel V.S., Rzhevskaya A.K. Guidelines for low-altitude aeromagnetic surveys (Russian Federal Agency for Subsoil Use, 2018) – the main points and the authors’ comments. In: GeoBaikal 2018: conference materials. 11–17 August 2018, Irkutsk. European Association of Geoscientists & Engineers; 2018, p. 1-7. https://doi.org/10.3997/22144609.201802012.

13. Davydenko A.Yu. Determination of residual and inductive magnetization of objects based on cascade inversion of magnetic survey data. In: Theoretical and Practical Issues of Geological Interpretation of Gravitational Magnetic and Electric Fields: Collected scientific papers. Perm: Ural Branch of the Russian Academy of Sciences, Mining Institute; 2025, vol. 1, p. 95-99. (In Russ.). EDN: XTVUJG.

14. Davydenko A.Yu. Magnetic field inversion based on elastic net and vector scanning to estimate 3D object magnetic susceptibility and remanent magnetizatio. In: Materialy 47-i sessii Mezhdunar. nauch. seminara D.G. Uspenskogo – V.N. Strakhova = Materials of the 47th session of D.G. Uspensky – V.N. Strakhov International scientific seminar. 27–30 January 2020, Voronezh. Voronezh: Nauchnaya kniga; 2020, р. 105-110. (In Russ.). EDN: SSQCEL.

15. Zou H., Hastie T. Regularization and variable selection via the elastic net. Journal of the Royal Statistical Society B (Statistical Methodology). 2005;67(2):301-320. (In Russ.). https://doi.org/10.1111/j.1467-9868.2005.00503.x.

16. Bobachev A.A. Electric field features in the air during low-frequency contactless electrical sounding. Prospect and protection of mineral resources. 2002;10:36-40. (In Russ.).

17. Gruzdev A.I., Bobachev A.A. Application features of non-contact measurements in resistance method. In: Inzhenernaya, ugol’naya i rudnaya geofizika-2015. Sovremennoe sostoyanie i perspektivy razvitiya: materialy konf. = Engineering, coal and ore geophysics-2015. Current status and development prospects: conference proceedings. 28 September – 2 October 2015, Sochi. Moscow: Interregional Public Organization Euro-Asian Geophysical Society; 2015, p. 178-183. (In Russ.). EDN: UMRFSR.

18. Gruzdev A.I. Comparison of different methods of contactand non-contact measurements in the midland of Russi. Engineering Survey. 2014;9-10:32-37. (In Russ.). EDN: TEGEUV.

19. Trofimov I.V., Bashkeev A.S., Savchenko V.A., Konshin I.O. Integration experience of resistivity method contactless technology and unmanned aerial vehicle measurements in primary gold prospecting in Bodaibo synclinorium. Earth sciences and subsoil use. 2024;47(3):248-261. (In Russ.). https://doi.org/10.21285/2686-9993-2024-47-3-248-261. EDN: PQZKDA.

20. Davydenko J.A., Davydenko A.J., Pesterev I.J., Jakovlev S.V., Davydenko M.A., Komjagin A.V., et al. Method of measuring and processing transient processes with grounded line during pulse field excitation with electric dipole to construct geoelectric sections and apparatus for carrying out said method using hardware-software electrical logging system (APEK «MARS»). Patent RF, no. 2574861; 2016. (In Russ.).