Phyllite, quartzitic and micaceous schists
Metamorphic schists (phyllite, quartzitic and micaceous) are used in the building construction as the major component of a fine gravel cover of roll tar paper (phyllite and micaceous schists), in an agriculture as inert dust carrier of pesticides (phyllite and micaceous schists), and in the manufacture of fire-proof materials as one of the major components of a fire-proof cement (quartzitic schists).
The occurrence of the schists deposits in Poland is presented on the map.
Three deposits of phyllite schists from Opolskie Voivodeship are the only deposits of that raw material hitherto documented in Poland: Chomiąża, Dewon-Pokrzywna and Dewon-Pokrzywna 2. Anticipated economic resources of phyllite schists in Poland were estimated as of the end of 2018 at 16,336.30 thousand tonnes. Similarly to the previous years, the exploitation was carried out only from Dewon-Pokrzywna deposit – it amounted to 159.99 thousand tonnes and decreased by 2.02 thousand tonnes (1.25%) in comparison with 2017. The anticipated economic resources of this deposit decreased by 220.08 thousand tonnes (1.57%) due to the exploitation and losses and amounted to 13,763.26 thousand tonnes. Two other deposits are not being exploited.
Figure below shows changes in domestic resources and production of phyllite schists in Poland in the years 1989-2018.
Quartzitic schists occur only within the Strzelin granite massif at Jegłowa in the Lower Silesian region (Dolnośląskie Voivodeship). Jegłowa deposit is still the only documented and temporarily exploited deposit of that raw material in Poland and therefore should be particularly protected. Its anticipated resources (beyond protective pillars) were estimated in 2018 at 8 692.66 thousand tonnes and economic resources at 2,761.40 thousand tonnes. The anticipated economic resources decreased by 4.37 thousand tonnes, whereas the economic resources dropped by 4.36 thousand tonnes, due to the new evidence report of the resources elaborated for the deposit.
Figure below shows changes in domestic resources and production of quartzitic schists in Poland in the years 1989-2018.
Micaceous schists occur in two deposits located in Dolnośląskie Voivodeship: Jawornica deposit in Kłodzko County and Orłowice deposit in Lubań and Lwówek Śląski Counties. Total anticipated economic resources of the mineral raw material as of 31.12.2018 are estimated at 6,648.98 thousand tonnes and economic resources at 4,387.23 thousand tonnes. The resources from Orłowice deposit account for 85.61% of anticipated economic resources and 88.22% of economic resources. In 2018 the exploitation was being carried out only from Orłowice deposit. The output amounted to 2.41 thousand tonnes and decreased by 0.31 thousand tonnes (11.40%) in comparison with 2017.
Figure below shows changes in domestic resources and production of micaceous schists in Poland in the years 1989-2018.
Prepared by: Marcin Tymiński