Croatian Critical Mineral Commodity Letters: Magnesium

Main Article Content

Sibila Borojević Šoštarić
Nenad Tomašić
Vječislav Bohanek
Nikola Gizdavec
Slobodan Miko

Abstract

Magnesium is a critical raw material of high importance to the European Union economy. Magnesium has  versatile applications in many industries: the automotive industry (48%), packaging applications (23%), the  construction industry (13%), desulphurisation of steel (12%), heavy transportation (air, marine, train; 4%) as well  as in medical equipment, sport applications, electrochemical and organic chemistry applications. The Republic  of Croatia hosts two major sources of magnesium: (1) primary dolostone deposits and occurrences, mainly used as a high-quality crushed stone aggregate and carbonate mineral raw material for industrial processing, and (2)  secondary Mg reject brine from the Nin, Pag and Ston saltpans: (1) Deposits and occurrences of early and late  diagenetic dolostone are associated with the South Tethyan Megaplatform (STM; Upper Triassic Hauptdolomite  and Lower Jurassic limestone and dolostone) or the Adriatic Carbonate Platform (AdCP; Jurassic limestone and  dolostone and Upper Jurassic boundstones, layered and massive dolostone and Lower to Middle Cretaceous  dolostone and post-sedimentary, diagenetic breccia). Based on their lithological, mineralogical, and chemical  characteristics, STM deposits are considered high-potential magnesium sources, whereas AdCP deposits belong  to medium-to-high (Jurassic) and low-potential (Cretaceous) magnesium sources. The overall geological  potential of primary magnesium sources at a scale of 1:300,000 has been calculated by excluding areas where  exploitation is prohibited. In the resulting areas, exploitation is possible, but additional restrictions arising from  the three levels of spatial plans (national, county, and local) must additionally be taken into account. (2) Average  annual salt production in Croatia is around 20,000 t. The calculated amount of discharged magnesium from highsaline brines remaining after the precipitation of sodium-chloride is about 2.38 t/annually. The case study  on the Đipalo dolostone deposit near Sinj (STM dolostone; exploitation reserves of 5.9 Mt) shows high purity  dolostone with MgO > 22 wt%, whereas the sum content of SiO2, Fe2O3 and Al2O3 remains below 1 wt%. The Đipalo dolostone can be used in the refractory material industry, as an agent of fusion in ferrous metallurgy, in  the production of cement, glass, ceramics, paper or for magnesium metal production. The prices of various Mg-products range from 1.7 €/t construction mineral raw material, 10 €/t for crushed stone aggregate, 100 €/t for  refractory (roasted) dolostone and about 2,250 €/t for 99,0% pure magnesium (February 2024). Dolostone  consumption for the Đipalo deposit is estimated to be about 10-15 t of dolostone per tonne of Mg metal  produced, depending on the process, however, the estimated CO2 emissions remain a significant negative factor.

Article Details

Section

Review Papers

Author Biography

Sibila Borojević Šoštarić, University of Zagreb; Faculty of Mining Geology and Petroleum Engineering

Department of Mineralogy, Petrology and Mineral Recourses

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