## 5 Discussion and Recommendations Resulting from the Performance of Multicriteria Analysis  
Results of the model synthesis indicate that two of the analysed sites, i.e., Grabina Sl. and Gniewkow are the most attractive for potential new application of the deposited waste with 27.1% and 26.7% of the total score, respectively. The site that ranked third, Krzeniow, obtained approximately 10 percent point lower score (16.1%) and the remaining three sites were evaluated at a lower and nearly the same score of 10%. Results in Table 4 provide overall priorities for these sites. The highest position of the Grabina Sl. and Gniewkow sites arises from the fact that the material store there is most suitable for new use in the two most preferred potential uses of such waste, i.e., road and railroad construction and construction industries (Table 2). However, if we chose to assess potential of these six analysed mining waste sites for a different preferred application, then we should consider these results jointly with the determined weights of local preferences with respect to the potential waste uses (Table 3). For example, if we consider looking for mining waste site with the greatest potential for use in the food industry, then site 2 Lubien and site 6 Romanowo are the most attractive, and in the case of choosing to store the deposit, site 6 due to its characteristics is the least suitable for uses other than deposition. Recommendations resulting from the conducted multicriteria analysis mainly arise from the generic composition of the waste located in the examined facilities. The conducted research indicated the most attractive potential application of stored waste for the given facilities, which is presented in Table 5. The landfills Grabina Sl. and Gniewkow contain loamy material and weathered granite. Their attractiveness is associated with the occurrence of granite, which can be used in the production of light aggregates or hydro-technical stone. Research concerning the use of granite waste for the production of light aggregates indicated an increase in the strength of obtained aggregates by approx. 1.5 times more than aggregates produced with the use of silica [32]. On the other hand, the hydro-technical stone can be used to stabilize landslides or slopes or to strengthen underwater slopes. Another highly rated application for granite waste materials may be their use for the production of rock meals. In the case of discussed landfills, it is also attractive to manage the loamy raw materials located in these facilities. This type of waste is also located in three facilities, which were assessed at the lowest level I, and these are Lubien, Boguszyce, and Romanowo. The possibilities of managing waste containing loamy raw materials apply to clays consisting mainly of clay minerals, such as kaolinite, montmorillonite, and other silicates, as well as quartz, apatite, granite, or iron hydroxide. These raw materials are characterized by special properties, such as high capillarity, unique rheological properties, hardening, plasticity, high swelling ratio, and they can be widely used in various branches of the \begin{table}
\begin{tabular}{c c c} \hline \hline
**Position** & **Alternatives (Waste Sites)** & **Overall Priority [\%]** \\ \hline
1. & Site 3. Grabina Sl. & 27.1 \\
2. & Site 4. Gniewkow & 26.7 \\
3. & Site 1. Krzeniów & 16.1 \\
4. & Site 2. Lubien & 10.6 \\
5. & Site 5. Boguszyce & 9.8 \\
6. & Site 6. Romanowo G. & 9.7 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Results of overall priority calculations. industry. Thus, one of the possibilities for their management is to use them for storing fruit and vegetables in households. The conducted research indicated that the use of clay may be the best ecological and cost-free storage mechanism, compared to the storage in warehouses and cold stores. Another recommendation for the application of the discussed waste group is the possibility of their use for the production of sorbent-fertilizers, used for the reclamation of lands after the exploitation of sands.