Anwendung einer neuen semi-airborne CSEM Erkundungsmethode für Erzlagerstätten
The joint research project DESMEX (Deep Electromagnetic Soundings for Mineral EXploration) is founded by the Federal Ministry for Education and Research (BMBF) project r4 to develop a semi-airborne controlled-source electromagnetic (CSEM) exploration system for deep mineral deposits up to 1 km depth. In particular, two ground based electric dipole transmitters are used in parallel to provide strong signals for flight areas with 6x8 km dimensions. For optimum signal quality, two novel receiver systems – one SQUID based magnetometer and an induction coil – are applied and referenced with several ground stations. The measurements scheme is illustrated in Fig. 1.
In the first phase of the joint project the main focus was on the realization of the new method and the demonstration at two locations (Antimone deposit in Schleiz, Iron ore deposit in Kiruna, Sweden). Main work program in the subproject at LIAG was, besides preinvestigation and contribution to main experiments, the development of a frequency-domain finite-element modelling code for arbitrary CSEM setups.
See also DESMEX 1 page.
In the second phase of the project we wil demonstrate the effectiveness of the method to a number of deposits (Kropfmühl, Gosetal, Bad Grund, Schweden, Namibia), also by using new sensor types (OPM), measurements (AFMAG) and drones as alternative to helicopter. Main working tasks at LIAG are: