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Table III Water chemistry of samples collected within the study site at the Richmond Mine 5-way area (at the 5-way, A, B, C weirs, and at the A-slump and red pool in 2001). Concentrations are reported in millimolar units, nd = not determined.

From: Acid mine drainage biogeochemistry at Iron Mountain, California

Sample name

Date

A1

As

Ca

Cd

K

Mg

Mn

Na

Pb

SiO2

99IM25-way

May-99

54

1.6

5.9

0.14

nd

32

0.31

7.8

0.017

nd

OOIM15-way

June-00

29

0.9

2.9

0.07

nd

17

0.15

4.5

0.009

nd

01IM15-way

January-01

nd

0.316

nd

0.067

nd

nd

nd

0.596

nd

0.2

02IM15-way

March-02

64

2.0

8.1

0.11

nd

32

0.31

11.8

0.026

nd

99IM2A1

May-99

61

1.2

6.1

0.10

nd

37

0.33

6.6

0.015

nd

OOIM1A1

June-00

47

0.4

3.3

0.05

3.3

26

0.24

1.5

0.047

1.3

01IM1A1

January-01

nd

0.3

nd

0.04

nd

nd

nd

0.5

0.036

nd

02IM1A1

March-02

63

1.5

6.8

0.10

nd

31

0.31

11.0

0.018

nd

99IM2B1

May-99

57

1.7

6.2

0.15

nd

30

0.31

9.2

0.019

nd

00IM1B1

June-00

34

0.9

2.9

0.08

nd

17

0.16

5.4

0.011

nd

01IM1B1

January-01

nd

0.4

nd

0.09

nd

nd

nd

0.6

0.018

nd

02IM1B1

March-02

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

99IM2C1

May-99

51

0.8

3.8

0.13

3.4

29

0.29

2.5

0.046

1.5

OOIM1C1

June-00

41

0.6

3.2

0.10

2.7

23

0.23

1.9

0.039

1.3

01IM1C1

January-01

nd

0.4

nd

0.10

nd

nd

nd

0.5

0.039

nd

02IM1C1

March-02

65

1.8

8.1

0.10

nd

33

0.29

15.6

0.02

nd

02IMM B-back

March-02

35

nd

7.3

0.11

nd

17

0.18

12.1

0.023

nd

02IM1 C-back

March-02

67

nd

7.8

0.07

nd

32

0.29

16.0

0.02

nd

00IM1 A-slump

June-00

3

0.2

1.9

0.00

nd

2

nd

0.2

0.015

1.0

01IM1 A red pool

January-01

nd

0.0

nd

0.01

nd

nd

nd

0.2

0.006

nd

02IMM A-back

March-02

80

2.5

10.2

0.13

nd

43

0.38

13.6

nd

nd