# Quality Evaluation of Wasteless Mining in Dongguashan Based on Intuitionistic Fuzzy Set and VIKOR
## 4 Case Study
### Overview of the Dongguashan Copper Mine
To evaluate the impact of the mine on air quality, the dust removal unit of the paste-filling mixing station was monitored; meanwhile, the emission outlet of the de-dusting unit of the paste filling and mixing station in the mine abided by the secondary standard of the _Comprehensive Emission Standard for Air Pollutants_ (GB16297-1996) for new sources [30]. Table 6 shows the monitoring results of the outlet of the SX wet triple-effect dust collector and the corresponding emission standards. The monitoring results show that the dust emission concentrations and emission rates at the outlet of the de-dusting unit of the plant meet the limits of the corresponding standards;  
(5) Soil environment  
According to the actual situation of the Dongguashan Copper Mine, the construction of the Dongguashan Copper Mine may have had an impact on the soil environment around the mining area. Therefore, the current situation of the soil quality in the dry land along the upstream and downstream of the Red Star River of the mine was monitored. Table 7 shows the monitoring situation and the limit values of the _Soil Environment Quality Standard_ (GB15618-1995) [31] for the different location samples of two monitoring points. As shown in Table 8, the soil environment around the Dongguashan Copper Mine is in line with the standard limits; and the mining of the mine has not caused any negative impact on the soil environment; \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & \multicolumn{2}{c}{**Ekhaust Flow**} & \multicolumn{2}{c}{**Monitoring**} & \multicolumn{2}{c}{**Monitoring Results**} \\ \hline
**Flow Rate Range** & \begin{tabular}{c} **Average** \\ **Flow Rate** \\ \end{tabular} & **Dust** & \
\begin{tabular}{c} **Concentration** \\ **Range** \\ \end{tabular} &
\begin{tabular}{c} **Average** \\ **Concentration** \\ \end{tabular} & **Emission Rate** \\ \hline
**(N-m\({}^{3}\)/h)** & **(N-m\({}^{3}\)/h)** & **(N-m\({}^{3}\)/h)** & **/(mg/m\({}^{3}\))** & **/(kg/h)** \\ \hline Standard limit values & 1726–2121 & 1972 & 47–83 & 64 & 0.126 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Statistical table of outlet monitoring results of SX wet triple-effect dust collector. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & **Monitoring Sites** & **pH** & **Cu** & **Pb** & **Zn** & **Cd** & **As** \\ \hline \multirow{3}{*}{1} & Surface layer 0–20 cm & 8.23 & 88.5 & 74.4 & 117 & 0.280 & 4.10 \\  & Middle layer 20–60 cm & 8.64 & 45.8 & 57.9 & 69.1 & 0.196 & 3.85 \\  & Deep layer 60–100 cm & 8.50 & 50.1 & 49.9 & 62.6 & 0.112 & 3.39 \\ \hline \multirow{3}{*}{2} & Surface layer 0–20 cm & 7.96 & 92.1 & 161 & 203 & 0.293 & 12.9 \\  & Middle layer 20–60 cm & 7.79 & 81.5 & 133 & 187 & 0.213 & 11.4 \\ \cline{1-1}  & Deep layer 60–100 cm & 7.68 & 69.7 & 120 & 141 & 0.158 & 8.85 \\ \hline \multicolumn{2}{c}{IV standard value in GB15618-95} & \(>\)6.5 & \(\leq\)400 & \(\leq\)500 & \(\leq\)500 & \(\leq\)1.0 & \(\leq\)30 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Soil environmental quality monitoring results (Unit: mg/kg). (6) Resource recovery efficiency  
In terms of resource recovery, the Dongguashan Copper Mine mainly adopted the backfilling method to mine the deposits, so that the resources can be recovered to the maximum extent. At the same time, the visualization simulation of the large-scale mining process of the deep shafts was realized, and the simulation software was applied to the design of the deep shaft retrieval to optimize the retrieval sequence for the safe and efficient mining of the deep shafts under high-stress conditions; besides, the mine has also carried out a strict and reasonable mining plan to extract the mineral resources, so that the deposit resources can be fully recovered.