Table 3 Environmental risk levels of the different heavy metals in the various functional mine areas
Level | Reclamation area | Residential area | Sewage plant area | ||||||
|---|---|---|---|---|---|---|---|---|---|
Pb (%) | Zn (%) | Cd (%) | Pb (%) | Zn (%) | Cd (%) | Pb (%) | Zn (%) | Cd (%) | |
1 | 20 | 20 | 35 | 40 | 0 | 0 | 45 | 25 | 25 |
2 | 20 | 30 | 25 | 20 | 0 | 10 | 10 | 5 | 0 |
3 | 20 | 45 | 35 | 10 | 30 | 20 | 10 | 15 | 10 |
4 | 15 | 5 | 0 | 20 | 60 | 35 | 10 | 10 | 10 |
5 | 25 | 0 | 5 | 10 | 10 | 35 | 25 | 45 | 55 |
Level | Mining area | Tailings area | Farmland area | ||||||
|---|---|---|---|---|---|---|---|---|---|
Pb (%) | Zn (%) | Cd (%) | Pb (%) | Zn (%) | Cd (%) | Pb (%) | Zn (%) | Cd (%) | |
1 | 5 | 5 | 5 | 15 | 5 | 10 | 18.18 | 0.00 | 0.00 |
2 | 0 | 0 | 0 | 10 | 10 | 5 | 18.18 | 0.00 | 0.00 |
3 | 0 | 0 | 5 | 25 | 10 | 20 | 27.27 | 9.09 | 0.00 |
4 | 0 | 15 | 10 | 20 | 40 | 0 | 9.09 | 45.45 | 36.36 |
5 | 95 | 80 | 80 | 30 | 35 | 65 | 27.27 | 45.45 | 63.64 |
Level | Total mine area | ||
|---|---|---|---|
Pb (%) | Zn (%) | Cd (%) | |
1 | 24.32 | 9.91 | 13.51 |
2 | 12.61 | 8.11 | 7.21 |
3 | 14.41 | 18.92 | 16.22 |
4 | 12.61 | 27.93 | 13.51 |
5 | 36.04 | 35.14 | 49.55 |