Developing multi-sensor drones for geological mapping and mineral exploration: setup and first results from the MULSEDRO project

Bulletin

Björn Heincke*1, Robert Jackisch2, Ari Saartenoja3, Heikki Salmirinne4, Sönke Rapp5, Robert Zimmermann2, Markku Pirttijärvi3, Erik Vest Sörensen1, Richard Gloaguen2, Lisa Ek6, Johan Bergström6, Arto Karinen3, Sara Salehi1, Yuleika Madriz2 and Maarit Middleton4

REVIEW ARTICLE | OPEN ACCESS

GEUS Bulletin Vol 43 | e2019430302 | Published online: 29 July 2019

https://doi.org/10.34194/GEUSB-201943-03-02

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The use of Unmanned Aerial Systems (UAS), also known as drones, is becoming increasingly important for geological applications. Thanks to lower operational costs and ease of use, UAS offer an alternative approach to aircraft-based and ground-based geoscientific measurements (Colomina & Molina 2014). Magnetic and hyperspectral UAS surveys hold particular promise for mineral exploration, and several groups have recently published studies of magnetic data collected by UAS for such applications (Malehmir et al. 2017; Cunningham et al. 2018), although equivalent studies using hyperspectral data are still rare (Kirsch et al. 2018). Combining both techniques is particularly useful. Magnetic measurements play an important role in mineral exploration, since magnetisation in rocks is mainly associated with magnetite and other iron minerals, which can be used in mapping and targeting of mineral deposits (Dentith & Mudge 2014). Hyperspectral imaging (HSI) is a powerful exploration and mapping technique in areas where the rock surface is well-exposed, and where geological units and mineral compositions can be estimated from spectral features of the electromagnetic spectrum in the visual and infrared range.

This paper reports on the setup of UAS multi-sensor systems that can collect both magnetic and hyperspectral data, developed within the EU-funded MULSEDRO project (MULti-SEnsor DROnes). We focus on small, lightweight solutions with take-off weights less than 5 kg. This is because regulations restrict commercial UAS operations in many countries according to take-off weight, flight height and operating range – typically, only operations in the (extended) visual line of sight are allowed. Lightweight systems are also particularly advantageous to support geological field campaigns as they can be quickly deployed to survey areas of interest.

Here, we use both a multi-copter and a fixed-wing UAS as both platforms have advantages. Multi-copters can fly at low elevation and speed, allowing them to follow strongly varying topography and collect high-resolution data that are comparable to traditional ground surveys. Fixed-wing UAS reach higher speeds and have longer endurance, such that larger areas can be mapped in a short time – comparable to smaller helicopter surveys. In addition, we have developed a new integrated positioning system (IPS) for UAS use that is not based on GPS. This affords accurate positioning within areas of poor GPS reception, such as mining tunnels and narrow valleys.

AUTHOR INFORMATION

*Corresponding author: Björn Heincke. Email: bhm@geus.dk

1 Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

2 Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz Institute Freiberg for Resource Technology, Chemnitzer Str. 40, 09599 Freiberg, Germany

3 Radai Oy, Teknologiantie 18, 90590 Oulu, Finland

4 Geological Survey of Finland, Lähteentie 2, FI-96101 Rovaniemi, Finland

5 Deutsche Montan Technologie GmbH, Am Technologiepark 1, 45307 Essen, Germany

6 LTU Business AB, Aurorum 1, 97775 Luleå, Sweden 

ABOUT THIS ARTICLE

This article is published in the Geological Survey of Denmark and Greenland Bulletin – an international, peer-reviewed and open access journal published by the Geological Survey of Denmark and Greenland (GEUS).

HOW TO CITE

Heincke, B., Jackisch, R., Saartenoja, A., Salmirinne, H., Rapp, S., Zimmermann, R., Pirttijärvi, M., Sörensen, E.V., Gloaguen, R., Ek, L., Bergström, J., Karinen, A., Salehi, S., Madriz, Y. & Middleton, M. 2019: Developing multi-sensor drones for geological mapping and mineral exploration: setup and first results from the MULEDRO project. Geological Survey of Denmark and Greenland Bulletin 43, e2019430302. https://doi.org/10.34194/GEUSB-201943-03-02

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PUBLICATION HISTORY

Date received: 18/02/2019

Date accepted: 29/05/2019

First published online: 29/07/2019

KEYWORDS

Drones . Geological Mapping . Unmanned Aerial System . Hyperspectral imaging . Magnetic survey