Phyllite, quartzitic and micaceous schists
Metamorphic phyllite, quartzitic and micaceous schists 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, and in the manufacture of fire-proof materials as one of the major components of a fire-proof cement (crystalline schists).
The 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 in 2016 at 16,751.64 thousand tonnes. The production was carried out only from Dewon-Pokrzywna deposit and amounted to 184.09 thousand tonnes. It increased by 49.08 thousand tonnes (36.4%) in comparison with 2015. The anticipated economic resources of this deposit decreased by 375.48 thousand tonnes mainly due to the exploitation, resources reclassification and losses and amounted to 14,178.60 thousand tonnes. Two other deposits are not being exploited.
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 2016 at 8,697.03 thousand tonnes and economic resources at 2,765.76 thousand tonnes. The resources have not changed in comparison with 2015 as there was not exploitation from this deposit.
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 mineral raw material as of 31.12.2016 are estimated at 6,655.18 thousand tonnes and economic resources at 4,393.43 thousand tonnes. The resources from Orłowice deposit account for 85.61% of anticipated economic resources and 88.21% of economic resources. The exploitation is being carried out from both of these deposits. In 2016, the production from Jawornica deposit increased by 0.47 thousand tonnes (94%) in comparison with 2015 and amounted to 0.97 thousand tonnes. The output from Orłowice deposit was by 2.21 thousand tonnes (74.92%) higher than in 2015 and equal 5.16 thousand tonnes.
Prepared by: Marcin Tymiński