Phyllite, quartzitic and micaceous schists
Metamorphic phyllite, quartzitic and micaceous schists are used in the building construction as the major component of fine gravel cover of roll tar paper (phyllite and mica schists), in agriculture as inert dust carrier of pesticides, and in the manufacture of fire-proof materials as one of the major components of fire-proof cement (crystalline schists).
The three deposits of phyllite schists from the Opole Voivodeship are the only deposits of that raw material hitherto documented in Poland (map): Chomiąża, Dewon-Pokrzywna and Dewon-Pokrzywna 2. Anticipated economic resources of phyllite schists in Poland were estimated in 2013 at about 17.66 million tonnes and production (from Dewon-Pokrzywna deposit) 143.40 thousand tonnes. Production decreased by 46.19 thousand tones (24.4 %) in comparison with 2012. The anticipated economic resources of this deposit decreased by 228.85 thousand tonnes and amounted to 15,082.77 thousand tonnes. Two other deposits are not being exploited. The Chomiąża deposit has been abandoned since 1989 and the remaining resources are estimated at 0.31 million tonnes.
Quartzitic schists occur only within the Strzelin granite massif at Jegłowa in the Lower Silesian region (Dolnośląskie Voivodeship). The Jegłowa deposit is still the only deposit of that raw material which has been documented in Poland. Its anticipated resources were estimated in 2013 at 8,697.03 thousand tonnes and economic resources at 2,765.76 thousand tonnes. The resources increased by 2,825.18 thousand tonnes due to the approval of a new deposit management plan with reclassified resources. Production of quartzitic schists in 2013 was equal 25.01 thousand tonnes (decreased by 3.17 thousand tonnes). The Jedłowa deposit is widely known for occurrences of beautiful quartz crystals, especially clear and colorless rock crystals.
Micaceous schists occur in Orłowice deposit located near Lwówek Śląski and in Jawornica deposit in Kłodzko County. Total anticipated economic resources of mineral raw material as of 31.12.2013 were estimated at 6,668.1 thousand tonnes, and economic resources at 4,406.35 thousand tonnes. The resources from Orłowice deposit account for 85.6 % of anticipated economic resources and 88.2 % of economic resources. In 2013, production from Orłowice deposit increased by 9 % to 2.51 thousand tonnes and from Jawornica deposit decreased by 60 % to 0.30 thousand tonnes (schists from this deposit are used as crushed stones).
Prepared by: Janina Dyląg