Financial report
166
the barrier, requiring a multi-phase rehabilitation to be carried out in 2024. All other works
for which provision has been made will also be carried out in 2024. The provision was
increased by EUR 792,894 to take account of the above additional provisions made in
previous years and the partial utilisation of the provision, resulting in a provision balance of
EUR 1,637,234 as at 31 December 2023 (EUR 888,133 at the end of 2022). In order to give
a better idea of the reason for the periodic restatement of the long-term provisions, the
following explanations are provided. It is a fact that the barriers at Za Travnikom and
Bukovžlak are constructed as earthen barriers, built of different materials in their
composition, which partly represent old burdens. They hold back and contain millions of
tonnes of material, making removal physically impossible. The barriers are exposed to
natural phenomena (precipitation, drainage, underground water flows, etc.) and are
constantly tending towards entropy. As a diligent and legally obliged operator, we carry out
regular technical observation and all the required monitoring. We react to the findings by
taking the measures deemed necessary by the experts to prevent the risk of harmful
emissions or damage from materialising. In addition to its own employees, Cinkarna has set
up a permanent project team, which includes experts from the Department of Geotechnics
(KGT) at the Faculty of Civil Engineering and Geodesy of the University of Ljubljana and the
design company Hydrosvet d.o.o. The project team meets on a regular basis to review the
agreed work and to discuss any new developments. The expert findings form the basis for
assessing the adequacy of the provisions made.
III. For the rehabilitation of the Bukovžlak non-hazardous waste landfill (ONOB), a non-current
provision of EUR 5 million was originally made in 2011 on the basis of a rough estimate. In
2017, at the time of the project preparation, the need for an additional provision of EUR 1
million became apparent. At that time, the specific implementation technique required was
already known, as well as the materials to be used in the installation. The balance at the end
of 2019, after partial utilisation, was EUR 4.5 million. Investigations into the impact of
contamination due to embedded old burdens (CDM Smith, KGT) showed the need for a
sealing curtain on the north-east side of the ONOB barrier and the rehabilitation of the C1
drainage under the high embankment of the Bukovžlak barrier. In 2023, the engineer was
asked to revise the estimate as at 31 December 2022, covering the necessary additions and
subtractions to the implemented facility, design supervision, geodetic monitoring, necessary
measurements and quality control of the installed materials. At the same time, the engineer
estimated the timeframe for completion of all the works, and a correction for expected
inflation was taken into account accordingly. We made a similar adjustment for 2023. We
spent EUR 121,755 for rehabilitation purposes and increased the provision by EUR 117,418,
mainly due to the need to rehabilitate the sealing curtain, as the estimates showed that we
had under-reserved the funds for its rehabilitation. Together with the facilities Drainage C1
and the Sealing Curtain, the amount of funds still needed for the rehabilitation of the ONOB
thus amounts to EUR 8,537,531 (at the end of 2022 it amounted to EUR 8,541,868). The
implementation of Drainage C1 together with the Sealing Curtain will be mainly carried out
in 2024 and 2025, and the implementation of the project for the reconstruction of the closed
ONOB will be carried out in 2027 and 2028.
IV. The results of regular technical monitoring of the high Bukovžlak barrier show a trend of
deteriorating safety on the eastern flank of the barrier. As in the case already described in
point II, the earthen barrier is reacting to the effects of natural phenomena. In order to avoid
a critical deterioration of the safety situation, the engineer foresaw two parallel interventions
in 2017 - rehabilitation of the eastern flank and preparation of the embankment to start
lowering the water level in the reservoir. In 2022, we spent EUR 48,602 of the funds. Based
on new findings and assessment in 2022 and the projects set out accordingly, a way of
lowering the level by lowering the spillway structure is now envisaged with the help of
external experts, which is a cheaper and easier solution than building an embankment. This