Table 4 Hydrochemical index of goaf water.

From: Identification of mine water sources using a multi-dimensional ion-causative nonlinear algorithmic model

Index

Na+

Ca2+

Mg2+

Cl–

SO42–

HCO3–

Minimum value

2.54

40.90

22.23

1.44

60.47

13.00

Maximum value

18.02

66.34

48.09

11.31

85.55

31.08

Average

8.73

51.09

39.63

2.91

78.02

18.69

Standard deviation

3.63

5.12

5.71

2.63

6.95

5.21

Coefficient of variation

0.41

0.10

0.14

0.90

0.09

0.28

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