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1 Acta Geophysica

1 2024

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Aeromagnetic and field data characterization of structural features for the delineation of potential gold mining sites in Northern Cameroon: a case study of Tchollire and environs

Anaba Fotze Quentin Marc, Palai Farida, Bi-Alou Marcelin Bikoro, Lordon Anatole Eugene Djieto, Ndougsa-Mbarga Théophile, Fru Mary Immaculate Neh, Lyonga David Ikome, Rodo Grace Nissia

Acta Geophysica

2024

Vol. 72, no. 3

1637--1659

The processing of aeromagnetic data was carried out in Northern Cameroon, with the aim of delineating the structural features which may be associated with the gold occurrence. Hence, the Horizontal Gradient upward continued at 1, 3, 5, and 9 km, and Euler Deconvolution (using a structural index = 0), were applied in this study. As a result, contacts/faults were delineated from both methods. The solution depths of those contacts/faults were computed around 0.1-2.49 km from the Euler Deconvolution, with a good match with the contacts/faults obtained from the Horizontal Gradient upward continued at 1 km; the interpretation of the depth to the top and to the bottom of the Tchollire Banyo Shear Zone (TBSZ) was estimated between 0.1 and 0.49 km and > 4.5 km, respectively. Besides, the qualitative interpretation of the aeromagnetic data shows that the study area is characterized by contacts/faults trending in the NE-SW/ENE-WSW, E-W, and NW/SE-WNW-ESE directions which are consistent with the main structural directions observed in the field. Hence, the new structural framework was established from the aeromagnetic data processing results constrained with field data of Tchollire locality and environs; the structural deformation phases are defined by WNW-ESE to NW-SE foliation/schistosity linked to deformation phase D1, NE-SW/ENE-WSW regional foliation (D2), and E-W shear zones/contacts (D3). Furthermore, a proximal match was observed between both aeromagnetic lineaments and gold mining locations, suggesting a structural control of hydrothermal fluids linked to the gold mineralizations. Thus, the results of this study (lineaments and their depths) could serve as an important tool for prospective mining studies in Northern Cameroon.