## 4 Discussion and Analysis  
In order to put forward a blasting optimization method that is more suitable for the geological conditions and production process of open-pit mines as much as possible, and to break the blasting effect optimization method that is based on the ideal condition, this paper puts forward an optimization method of cast blasting parameters that is based on the optimal economic dragline stripping technology. However, the cast blasting project is a large, complex system and its internal structure is complex. In addition, there are many influencing factors, the factors are coupled and interact with each other, and the quality of the cast blasting effect has a decisive influence on the production organization and economic benefits of the dragline stripping technology. Therefore, in the process of research, there are still certain aspects of content to be completed and improved.  
* Since the introduction of the cast blasting technology in the Heidaigou open-pit mine, the cast blasting project has been completed more than 260 times, and a large number of cast blasting parameter design schemes and related data characterization of the effect of cast blasting have been accumulated. However, this paper has not sorted out or analyzed all of the blasting parameter data or the blasting effect data effectively. In addition, the sample size in the research process is limited, thus resulting in part of the cast blasting environment and the cast blasting results not being effectively restored.
* The production cost of the whole system of the Heidaigou open-pit mine cast blasting and dragline stripping technology is mainly composed of the perforation cost, the cast blasting cost, the hydraulic backhoe and bulldozer auxiliary operation costs, the single bucket truck process auxiliary operation cost, the bucket shovel operation costs, etc. However, in the process of cost analysis, due to the limited cost data, the cost of hydraulic backhoes and bulldozer auxiliary operations cannot be effectively split or calculated; as such, this part of the cost was ignored in the process of cost analysis, thus resulting in certain errors in the system's cost.
* Due to being affected by the fluctuation of the equipment operating cost, the optimal blasting parameter combination based on the throwing blasting effect will be  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Position** & \(\mathbf{X_{1}}\) & \(\mathbf{X_{2}}\) & \(\mathbf{X_{3}}\) & \(\mathbf{X_{4}}\) & \(\mathbf{X_{5}}\) & \(\mathbf{X_{6}}\) & \(\mathbf{X_{7}}\) & \(\mathbf{X_{8}}\) &... \\ \hline
20-N05 & 0\({}^{\circ}\) & & & 0.758 & 6.8 & 6.1 & 6.5 & 9 & 11.8 &... \\
20-S46 & 1\({}^{\circ}\) & & & 0.759 & 6.9 & 6.3 & 7.0 & 9 & 11.9 &... \\
21-S12 & 2\({}^{\circ}\) & & & 0.762 & 6.9 & 6.2 & 7.4 & 9 & 12.2 &... \\
19-N51 & 3\({}^{\circ}\) & & & 0.763 & 7.0 & 6.3 & 7.3 & 9 & 11.9 &... \\ \hline
19-S14 & 0\({}^{\circ}\) & & & 0.765 & 7.0 & 6.4 & 6.2 & 9 & 11.8 &... \\
21-N52 & 1 & & & 0.77 & 6.9 & 6.4 & 6.7 & 9 & 11.8 &... \\
20-N03 & 2 & & 0.772 & 7.1 & 6.3 & 7.1 & 9 & 12.1 &... \\
20-S25 & 3 & & & 0.777 & 6.7 & 6.1 & 7.6 & 9 & 12.2 &... \\ \hline
21-S52 & 0 & & & 0.778 & 7.1 & 6.5 & 6.9 & 9 & 11.8 &... \\
20-N15 & 1 & & 0.78 & 6.9 & 6.3 & 7.0 & 9 & 12.0 &... \\
22-S09 & 2 & & 0.782 & 7.0 & 6.0 & 7.5 & 9 & 11.9 &... \\
22-S57 & 3 & & & 0.789 & 7.1 & 6.2 & 6.8 & 9 & 12.1 &... \\ \hline \hline \end{tabular}
\end{table}
Table 12: Optimum cast blasting parameter design under different working conditions.  
dynamically adjusted in order to achieve the optimal economic cost of the dragline stripping technology.