# Quality Evaluation of Wasteless Mining in Dongguashan Based on Intuitionistic Fuzzy Set and VIKOR
## 2 Theory of Wasteless Mining Methods
### Reference Standard for Wasteless Mining Evaluation  
Referring to the research on the indicators and classification standards of wasteless mining [21; 22; 23; 24], the evaluation indicators in wasteless mining evaluation include the utilization and treatment level of waste rock, tailings, wastewater and waste gas, the impact of the emissions on the surrounding soil and resource recovery. According to the pollution and utilization degrees of wastewater and soil environment, four levels are defined in the evaluation criteria, including the non-pollution, mild pollution, moderate pollution and serious pollution levels. The evaluation criteria for waste gas are also classified into four levels. According to their waste utilization rate and resource recovery rate, the mining recovery and the utilization of solid waste (such as tailings and waste rock) are quantitatively evaluated. Based on the above, combined with the national evaluation standards related to each indicator [25; 26; 27; 28; 29; 30; 31], the following classification criteria are proposed for the six evaluation indicators of wasteless mining:  
1. Evaluation criteria of waste rock tailings:  
Waste rock and tailings are the main solid wastes of the mine, and the utilization rate of the waste is taken as the evaluation index. Considering the actual situation of the mine, the utilization rate of the waste rock and tailings in a mine is calculated, and the evaluation criteria are summarized, as shown in Table 1. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Grade** & **Contamination Level** & **Utilization Rate of Waste Rock and Tailings** \\ \hline I & Non-pollution & 80–100\% \\ II & Mild pollution & 70–80\% \\ III & Moderate pollution & 60–70\% \\ IV & Severe pollution & 0–60\% \\ \hline \hline \end{tabular} (2) Evaluation criteria for wastewater pollution and soil quality:  
The pollution degrees of mine wastewater and soil refer to the wastewater discharge standard and soil environmental quality standard. During the evaluation, the discharge wastewater and the surrounding soil of the mining area are monitored and sampled, and compared with the national standards. According to the relationship between the various pollutants and the standard limits, the exceedance percentage in relation to the national standard is calculated, and then a qualitative comprehensive evaluation is carried out. Table 2 shows the evaluation criteria for the wastewater and soil quality.  
\begin{tabular}{c c} \hline \hline
**Grade** & **Contamination Level** & **Percentage of Exceedance/\%** \\ \hline I & Non-pollution & Not exceeded \\ II & Mild pollution & 0–200 \\ III & Moderate pollution & 200-300 \\ IV & Severe pollution & More than 300 \\ \hline \hline \end{tabular} (3) Evaluation criteria for exhaust gas pollution:  
With the increase in air pollution, exhaust gas pollution is gradually highlighted. and the impact of mine production on air quality is also included in the quality evaluation of wasteless mining. At present, there is no uniform grading standard for mine air quality. To effectively evaluate the mine air quality, the atmospheric air quality standards are referred to. Tables 3 and 4 show the evaluation criteria and air quality grading of mine exhaust pollution.  
\begin{tabular}{c c} \hline \hline
**Grade** & **Degree of Impact** \\ \hline I & Unaggravated \\ II & Aggravating Grade 1 \\ III & Aggravating Grade 2 \\ IV & Aggravating Grade 3 and above \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Air quality classification standards (concentration unit: mg/m3).