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Minerals 2018, 8(6), 233; https://doi.org/10.3390/min8060233

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

1
Argenco Department, GeMMe (Minerals Engineering, Materials and Environment), University of Liège, 4000 Liège, Belgium
2
Argenco Department, Applied Geophysics, University of Liège, 4000 Liège, Belgium
3
Department of Geology, Ghent University, 9000 Ghent, Belgium
4
Department of Civil, Geological and Mining Engineering, Montreal Polytechnic School, Montreal, QC H3T 1J4, Canada
5
Faculty of Sciences, Technology and Communication, University of Luxembourg, L-4364 Esch-sur-Alzette, Luxembourg
*
Authors to whom correspondence should be addressed.
Received: 2 May 2018 / Revised: 22 May 2018 / Accepted: 25 May 2018 / Published: 29 May 2018
(This article belongs to the Special Issue Mining and Mineral Exploration Geophysics)
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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. View Full-Text
Keywords: geophysics; exploration; ERT; IP; gravity; magnetometry; MVT deposit; Lontzen; Belgium geophysics; exploration; ERT; IP; gravity; magnetometry; MVT deposit; Lontzen; Belgium
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Evrard, M.; Dumont, G.; Hermans, T.; Chouteau, M.; Francis, O.; Pirard, E.; Nguyen, F. Geophysical Investigation of the Pb–Zn Deposit of Lontzen–Poppelsberg, Belgium. Minerals 2018, 8, 233.

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