## 3 Results and Discussion
### Quantitative Analysis
#### 3.2.2 Detailed Analysis
Importantly, very large amounts of ore pass through the bunker. The explanation in this case seems to lie in the lithology or high moisture content of the transported ore. The third analyzed unit is unit III, whose bunkers are partially located along the main conveyors, albeit the number of bins in the bunkers located in this unit is between one and three. Figure 12: Number of repairs for the elements A, B, C, and D, and the daily failure indicator for the 15 receiving bins. Figure 13: Number of repairs for the elements A, B, C, and D, and the daily failure indicator for the individual mining units in the mine. The analysis demonstrates that the mass of the ore passing through a bunker has a significant influence on its failure rate, and therefore a mass indicator was proposed in further research in order to describe what mass of ore determines the occurrence of a particular failure type in the elements A-D. For this purpose, total masses of ore passing through individual bunkers over the analyzed time period and number of repairs per bunker were calculated. The results of the measurements performed as part of this research are shown in Table 4 and in Figure 15. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & **A** & **B** & **C** & **D** & & & & & \\ \hline
1 & 2 & 4 & 3 & 2 & - & - & - & - & - \\
2 & 7 & 8 & 7 & 0 & 9436 & 1348 & 1179 & 1348 & \\
3 & 3 & 2 & 5 & 3 & 9436 & 3145 & 4718 & 1887 & 3145 \\
4 & 3 & 3 & 2 & 0 & - & - & - & - & \\
5 & 0 & 1 & 4 & 0 & 6290 & & 6290 & 1573 & \\
6 & 4 & 9 & 6 & 1 & 12,653 & 3163 & 1406 & 2109 & 12,653 \\
7 & 3 & 3 & 3 & 0 & 10,720 & 3573 & 3573 & 3573 & \\
8 & 6 & 7 & 8 & 0 & 10,729 & 1788 & 1533 & 1341 & \\
9 & 7 & 8 & 4 & 0 & 16,396 & 2342 & 2050 & 4099 & \\
10 & 8 & 7 & 6 & 1 & 5723 & 715 & 818 & 954 & 5723 \\
11 & 3 & 0 & 0 & 1 & - & - & & & \\
12 & 2 & 2 & 0 & 0 & - & - & - & & \\
13 & 5 & 5 & 1 & 5 & 4946 & 989 & 989 & 4946 & 989 \\
14 & 0 & 0 & 2 & 0 & 4483 & - & & 2242 & \\
15 & 2 & 2 & 2 & 0 & 2421 & 1211 & 1211 & 1211 & \\ \hline \hline \end{tabular} Empty cells in the table indicate that no data are available.  
\end{table} 
Table 4: Values of the mass indicator in relation to the amount of the transported ore.  
Figure 14: Different types of the transported ore: (**a**) large rock lumps, (**b**) dry ore, (**c**) moist ore. The greatest amounts of ore passed through bunker 9 (unit II), 6 (unit I), 7 (unit V), and 8 (unit II). Taking into account repairs for the elements A, B, C, and D, the indicators were calculated respectively for each of the bunkers. The results provided in the graph do not include the indicator for the element D, as its failures were occasional. The mass indicators demonstrate that in bunkers 2, 7, 8, 10, and 15 the elements A, B, and C undergo wear at a comparable speed, but with intensity different for each bunker. Failures of the vertical sealings B dominate in bunkers 3 and 5, while in bunkers 9, 13, and 14 the majority of failures (critical wear) occur in the case of linings on the side walls of the hopper C. The most frequent repairs were performed for bunker 10--every 0.8 million Mg, on average. In the case of bunkers 2, 7, 8, and 15 the repair frequency is every 1.3 million Mg, 3.6 million Mg, 1.5 million Mg, and 1.2 million Mg, respectively. In bunkers 3 and 5, the vertical sealings are replaced rarely in comparison to other repairs (on average every 4.7 million Mg and 6.3 million Mg). A different scope of repairs is observed in the case of bunkers 9, 13, and 14, in which the linings on the hopper walls C are replaced at the greatest intensity, every 4.1 million Mg, 4.9 million Mg, and 2.2. million Mg, respectively. In general, the linings in the feeder trough A were replaced in all bunkers after approximately 2.0 million Mg of ore had passed through it, the vertical sealings B were replaced after 2.4 million Mg, and the hopper wall linings C--after 2.3 million Mg.