Publications – Master’s Thesis
Testing of Reflection Seismic, Ground Penetration radar and Magnetic Methods for Mineral Exploration and Mine Planning at the Siilinjärvi Phosphate Mine Site in Finland
MSc Thesis by Laakso, V., University of Helsinki
Siilinjärvi mine in Finland is the only mine within the European Union producing phosphate rock, a critical raw material for the European Union. With the current mining plans, the production is estimated to continue until 2035. The extent of the ore deposit and new locations for open pits are presently being investigated to ensure continuation of the mining operations also after 2035. The goals of this work were to study the depth and lateral extent of the phosphate-bearing Siilinjärvi carbonatite-glimmerite deposit, major zones of weaknesses, waste-rock diabase dykes and a tonalite-diorite intrusion cutting the deposit south of the current main pit, and in particular the geophysical anomalies related to these features. Detailed 3D geological models created for the current main pit area by Smart Exploration PhD student Tuomas Kauti from the University of Turku were used as a reference for the interpretation of the new geophysical data. The carbonatite-glimmerite ore is associated with elevated magnetic total field values, and at a larger scale the deposit can be tracked with magnetic surveys. With reflection seismic method, the large geological structures can be imaged at depth (see Figure 38), and 3D seismic data could be used for detailed planning of a new open pit. The higher resolution GPR measurements could then be implemented in the operating phase of the mine in a more routine manner to aid creation of reliable production prognoses (see Figure 39).
The full thesis is available here.
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Smart Exploration has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No.775971