# Design Parameters Affecting Rill Swell Events for Block Caving Applications
## 4 Results
### Available Fine-Grained Material  
The number of fines over the hang-up was analyzed by height: columns of fines of 6 m, 15 m, and 30 m in height were studied and compared with the 7 m high columns used in previous sections. Brow beam heights of 1 m, 2 m, and 3 m and drawpoint widths of 5 m and 3 m were considered. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Parameters** & **DP Width: 5 m** & **DP Width: 3 m** \\ \hline Tonnage & 257 & 193 \\ Run-out distance towards the north (+; m) & 6.4 & 3 \\ Run-out distance towards the south (\(-\); m) & 9.3 & 6.9 \\ Large rocks in production drift? & Yes & No \\ Deposition angle in direction +, 1 (m) over the floor & 7\({}^{\circ}\) & - \\ Deposition angle in direction \(-\), 1 (m) over the floor & 8\({}^{\circ}\) & - \\ Height of flow (m) & 1.1 & 0.8 \\ \hline \hline \end{tabular}  
* Height of the base case.  
\end{table} 
Table 6: RS magnitude for different drawpoint widths. Figure 8: Plan views of the event modeled. (**A**) 1 m brow beam. (**B**) 3 m brow beam. Coarse fragments for the event associated with the brow beam of 1 m were of minor size. Table 7 presents the RS magnitude for events associated with columns of fines that were 6 m high, 15 m high, and 30 m high, respectively. According to the results, the RS magnitude expressed in tonnage was noticeably influenced by the drawpoint geometry, especially the brow beam height: For a brow beam of 1 m, the RS magnitude was 359-495 t depending on the available quantity of fines over the hang-up; for a brow beam of 2 m, the RS magnitude was 256-334 t; and for a brow beam of 3 m, the RS magnitude was 120-147 t. Thus, the smaller the brow beam, the larger the RS event. The presence of large rocks in the production drift was observed for the brow beams of 2 m and 1 m, but not for the brow beam of 3 m, independently of the mass of fines over the hang-up. This phenomenon can be explained by the flowability of the fine material for different d \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Height of Fine Material**} & \multirow{2}{*}{**Parameters**} & \multicolumn{2}{c}{**DP Width: 5 m**} & \multicolumn{2}{c}{**DP Width: 3 m**} \\ \cline{3-5}  & & **BB 1 m** & **BB 2 m** & **BB 3 m** & **BB 2 m** \\ \hline \multirow{6}{*}{6 m} & Tonnage & 359 & 256 & 120 & 190 \\  & Run-out distance towards the north (+; m) & 11 & 8.6 & 4.9 & 7.9 \\  & Run-out distance towards the south (\(-\); m) & 5.7 & 4.6 & 2.1 & 2.2 \\  & Large rocks in production drift? & Yes & Yes & No & Yes \\  & Deposition angle in direction +, 1 (m) over the floor & 16 & 6 & - & - \\  & Deposition angle in direction \(-\), 1 (m) over the floor & 15 & 6 & - & - \\  & Height of flow (m) & 1.4 & 1.1 & 0.4 & 0.9 \\ \hline \multirow{6}{*}{15 m} & Tonnage & 446 & 287 & 137 & 212 \\  & Run-out distance towards the north (+; m) & 8.8 & 8.2 & 3.6 & 4 \\  & Run-out distance towards the south (\(-\); m) & 13 & 9.8 & 6.5 & 7.3 \\  & Large rocks in production drift? & Yes & Yes & No & Yes \\  & Deposition angle in direction +, 1 (m) over the floor & 15\({}^{\circ}\) & 7\({}^{\circ}\) & - & - \\  & Deposition angle in direction \(-\), 1 (m) over the floor & 17\({}^{\circ}\) & 8\({}^{\circ}\) & - & - \\  & Height of flow (m) & 2 & 1.1 & 0.4 & 0.5 \\ \hline \multirow{6}{*}{30 m} & Tonnage & 495 & 334 & 147 & 234 \\  & Run-out distance towards the north (+; m) & 12.3 & 11.5 & 5 & 5.1 \\ \cline{1-1}  & Run-out distance towards the south (\(-\); m) & 13.3 & 10.6 & 6.5 & 9.4 \\ \cline{1-1}  & Large rocks in production drift? & Yes & Yes & No & Yes \\ \cline{1-1}  & Deposition angle in direction +, 1 (m) over the floor & 13\({}^{\circ}\) & 7\({}^{\circ}\) & - & - \\ \cline{1-1}  & Deposition angle in direction \(-\), 1 (m) over the floor & 16\({}^{\circ}\) & 12\({}^{\circ}\) & - & - \\ \cline{1-1}  & Height of flow (m) & 2 & 1.4 & 0.5 & 1 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: RS magnitude for different heights of fine material tested. Figure 9: Plan view of the event modeled, with a drawpoint of 3 m in width.