Mineral raw materials for engineering works
To the group of raw materials for engineering works there have been deposits called "earth masses for building purposes" classified. They are usually clayey-sandy and clayey rocks, but also others - sandstones and limestones which do not fulfill the criteria necessary for dimension and crushed stones. These raw materials are utilized in the road industry for the road embankments building and the maintenance of dirt roads surface. Clayey rocks can be also used for the packing and reclamation of waste disposals, for the hydro-building and other purposes. The usefulness of these raw materials is determined by i.e. its geological-engineering parameters or sealing properties.
Usually resources of mineral raw materials for engineering works are documented as an accompanying raw material in sand and gravel deposits, whereas in only about 30% of cases are documented as the main raw material.
Anticipated economic resources amounted to 9.347 million m3 in 2016 and increased by 0.145 million m3 (1.6%) in comparison with the previous year.
There were four new deposits documented in 2016: Narty (0.128 million m3) and Narty II (0.096 million m3) in Mazowieckie Voivodeship, Mlewo IV (0.091 million m3) in Kujawsko-Pomorskie Voivodeship, Rozbark (0.179 million m3) in Śląskie Voivodeship. The resources growth due to these documentations was equal 0.494 million m3.
The table given below shows the current state of identification and management of mineral raw materials for engineering works resources in Poland.
The production of mineral raw materials for engineering works amounted to 0.159 million m3 in 2016 and increased by 4.7 times more in comparison with the previous year. The year to year fluctuations of the output are significant and may be caused by the changes of production even from single deposits. In 2016 the growth was the result of an increasing output from already exploited deposits (i.e. Gniewczyna Tryniecka-I deposit with ninefold production growth year to year – 0.070 to 0.008 million m3) and due to the beginning of exploitation from several other deposits.
Economic resources were calculated for 10 deposits. They amounted to 4.095 million m3 which accounts for 88.0% of anticipated economic and sub-economic resources of these deposits. In some cases, economic resources are larger than anticipated economic resources demonstrated in table 2, because they not only contain anticipated economic resources but also anticipated sub-economic – which are not shown in the collation below.
The figure given below shows changes in domestic resources and production of mineral raw materials for engineering works in Poland in the years 2000-2016.
Prepared by: Wojciech Szczygielski