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Geophysical Investigation of the Pb–Zn deposit of Lontzen–Poppelsberg, Belgium

Maxime Evrard, Gaël Dumont, Thomas Hermans, Michel Chouteau, Olivier Francis, Eric Pirard and Frédéric Nguyen

Article (2018)

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Cite this document: Evrard, M., Dumont, G., Hermans, T., Chouteau, M., Francis, O., Pirard, E. & Nguyen, F. (2018). Geophysical Investigation of the Pb–Zn deposit of Lontzen–Poppelsberg, Belgium. Minerals, 8(6). doi:10.3390/min8060233
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Abstract

The drillhole information from the Lontzen–Poppelsberg site has demonstrated three orebodies and has allowed the estimation of the extension of the lodes, their dip, and the location at the ground surface. The localisation of the lodes makes them excellent targets for further exploration with geophysics. This deposit is classified as a Mississippi Valley Type (MVT) deposit. It consists mainly of Pb–Zn–Fe sulphides that display contrasting values in resistivity, chargeability, density, and magnetic susceptibility, with regards to the sedimentary host rocks. The dipole–dipole direct current (DC) resistivity and induce polarization (IP) profiles have been collected and inverted to successfully delineate the Pb–Zn mineralization and the geological structures. Short-spacing EM34 electromagnetic conductivity data were collected mainly on the top of Poppelsberg East lode and have revealed a conductive body matching with the geologically modelled mineralization. Gravity profiles have been carried out perpendicularly to the lode orientation; they show a strong structural anomaly. High resolution ground magnetic data were collected over the study area, but they showed no anomaly over the ore deposits. The geophysical inversion results are complementary to the model based on drill information, and allow us to refine the delineation of the mineralization. The identification of the geophysical signatures of this deposit permits targeting new possible mineralization in the area.

Uncontrolled Keywords

geophysics; exploration; ERT; IP; gravity; magnetometry; MVT deposit; Lontzen; Belgium

Open Access document in PolyPublie
Subjects: 1400 Génie minier et minéral > 1400 Génie minier et minéral
1400 Génie minier et minéral > 1403 Mécanique des roches
Department: Département des génies civil, géologique et des mines
Research Center: Non applicable
Funders: Fonds pour la recherche dans l’industrie et l’agriculture (FRIA)
Date Deposited: 19 Jul 2021 16:00
Last Modified: 20 Jul 2021 01:20
PolyPublie URL: https://publications.polymtl.ca/4860/
Document issued by the official publisher
Journal Title: Minerals (vol. 8, no. 6)
Publisher: MDPI
Official URL: https://doi.org/10.3390/min8060233

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