Magnesite (magnesium carbonate - MgCO3) originates from decay of magnesium-rich igneous rocks under hydrothermal conditions and forms white accumulations.
Polish magnesite deposits are related to the Sobótka, Szklary, Grochowa-Braszowice massifs of Precambrian serpentinites and the Gogołów-Jordanów Massif of ultramafic rocks in the Lower Silesian region (map). Up to the present, six magnesite deposits have been proven in this region. The deposits are of the vein type, with individual veins attaining up to 3 meters in thickness and characterized by complex geological structure and high variability in quality of the raw material. Magnesite is currently exploited in an open strip mine at Braszowice only.
Magnesite is used mainly as semi-manufactured material in production of multi-component artificial fertilizers, in purification of potable water and sewage treatment and as mineral additive to animal feed.
Table 1 shows resources and the state of development and exploration of magnesite deposits in Poland.
Anticipated economic resources for the end of 2010 were estimated at 14.64 million tonnes.
In 2010, domestic production of magnesite was equal 63 thousand tonnes, slightly increasing in comparison with that from the previous year. The domestic production remains insufficient to cover the demand for that raw material, especially in relation to quality requirements. This results in large and steadily increasing import of that commodity. In 2010 import rose by about 60 % in relation to the previous year and was equal 36.9 thousand tonnes (Table 2).
- B - for solid minerals - mine in building process, for fuels - prepared for exploitation or trial period of the exploitation
- E - exploited
- G - underground natural gas storage facilities
- M - deposit crossed out of the annual report of mineral resources during analized period
- P - deposit covered by preliminary exploration (in C2+D category, for fuels – in C category)
- R - deposit covered by detailed exploration (in A+B+C1 category, for fuels – in A+B category)
- Z - abandoned deposit
- T - deposit exploited temporarily
- K - change of the raw material in deposit
Prepared by: Agnieszka Malon