Table 1 Water-extractable trace elements and soil health metrics of the mine tailings (mean ± standard deviation)

As (ng/g)

11

75 ± 19

56 ± 21

86 ± 20

76 ± 27

74 ± 17

66 ± 19

Cd (ng/g)

2160

706 ± 46

669 ± 17

701 ± 34

727 ± 29

696 ± 29

672 ± 24

Co (ng/g)

798

147 ± 9

145 ± 5

137 ± 12

155 ± 8

141 ± 7

145 ± 5

Cu (ng/g)

1210

557 ± 59

639 ± 109

296 ± 121

754 ± 50

657 ± 106

830 ± 67

Mn (μg/g)

455

68 ± 8

61 ± 9

71 ± 6

81 ± 10

68 ± 5

62 ± 4

Pb (μg/g)

104

73 ± 4

69 ± 4

72 ± 4

69 ± 4

74 ± 5

68 ± 2

Sb (ng/g)

137

600 ± 47

690 ± 29

548 ± 34

693 ± 43

608 ± 34

703 ± 44

Zn (μg/g)

215

21 ± 2

21 ± 1

21 ± 2

22 ± 1

20 ± 1

21 ± 1

pH

5.11

6.63 ± 0.03

6.7 ± 0.06

6.68 ± 0.06

6.69 ± 0.04

6.65 ± 0.06

6.75 ± 0.05

Total nitrogen (mg/g)

0.08

0.14 ± 0.04

0.16 ± 0.01

0.12 ± 0.01

0.17 ± 0.01

0.12 ± 0.02

0.16 ± 0.01

Inorganic carbon (mg/g)

4.70

3.99 ± 0.31

3.79 ± 0.22

3.66 ± 0.29

3.73 ± 0.28

3.90 ± 0.34

3.67 ± 0.18

Organic carbon (mg/g)

2.00

2.00 ± 0.07

2.28 ± 0.11

2.09 ± 0.07

2.44 ± 0.20

2.10 ± 0.08

2.48 ± 0.06