Mount Morgan Mine Upper Mundic Gully TSF EA Amendment

Appen d ix A - Tabulated Groundwater Chemistry Results

Heritage Minerals MMM EA Compliance Review

Total Dissolved Solids Aluminium Arsenic Cadmium Chromium Cobalt

Electrical Conductivity

pH Value

Copper

Lead Manganese Nickel

Selenium Zinc Total Cyanide

units pH Unit

µS/cm

mg/L

WQO lower WQO upper

7.5 8.1

2,765 4,790 5,130 4,830 4,920 3,860 3,690 4,250

1,797 5,690 6,170 6,090 6,270 5,950 5,630 5,960

0.055 27.1 26.2 20.8

0.013 0.008 0.003 0.006 0.005 0.004 0.007 0.004 0.009 0.011 0.005 0.004 0.004 0.004 0.006 0.004 0.005 0.004 0.005 0.006 0.004 0.006 0.004 0.004 0.004

0.0002 0.169 0.142 0.139 0.15 0.152 0.147 0.152

0.001 <0.001 0.003 0.006

0.001 1.93 1.91 1.74

0.0014

0.0034 0.003 0.002 0.002 0.002 0.002 0.003 0.001 0.002 0.005 0.001 0.002 0.002 <0.001 0.002 0.002

1.9

0.011 0.588 0.543 0.546 0.546 0.539 0.551 0.536 0.695 0.959 0.562 0.496 0.492 0.441 0.597 0.482 0.583 0.475 0.547 0.51 0.498 0.456 0.518 0.506 0.47

0.011 0.03 0.02 0.01

0.008 20.1 20.4 18.4

0.007

MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14 MB14

31/08/2022 3.9 6/10/2022 3.87 3/11/2022 3.88 6/12/2022 3.83 31/01/2023 4.33 3/03/2023 4.19 13/04/2023 3.92 30/05/2023 3.48 28/06/2023 3.55 27/07/2023 3.83 31/08/2023 3.85 19/09/2023 3.81 19/10/2023 4.56 23/11/2023 3.74 19/12/2023 3.86 23/01/2024 3.73 22/02/2024 3.83 20/03/2024 3.87 29/04/2024 3.85 20/05/2024 3.83 11/06/2024 4.83 25/07/2024 3.71 21/08/2024 3.73 18/09/2024 3.83

128 140 131 129 140 138 125 92.4 43.6 132 117 128 102 118 118 125 106 116 122 114 109 126 113 107

84.9 84.7 75.5 78.8 76.6 83.9 72.7 149 235 81.1 76.2 77.7 74.2 96.5 71.7 85.4 67.3 74.4 73.9 64.9 69.9 68.9 66.6 70.5

<0.004 <0.004 <0.004 <0.004 <0.020 <0.004 <0.004 <0.004 <0.004 <0.004 <0.004 <0.004 <0.004 <0.004 <0.020 <0.004 <0.004 <0.004 <0.004 <0.020 <0.004 <0.004 -

22.3 22.9 25.5 64.1 124 25.9 21.4 23 23.5 40.8 20.6 26.1 19.4 22.2 19.5 17.8 13.2 21 19.2 22.5 19

0.017 0.001 0.005 0.002 0.001 0.001 0.001 0.002

1.82 1.69 1.82 1.63 3.48 1.84 2.5 1.48 1.95 1.58 1.76 1.47 1.59 1.67 1.55 1.6 1.7 1.46 1.65 1.55

0.02 0.01 0.03 0.03 0.02 0.02 0.02 0.02 0.03 0.03 0.03 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01

20.3 18.7 20.1 18.8 19.3 20.6 20.4 17.9 19.1

7,600 10,300 5,020 4,670 4,780 4,840 5,440 4,050

10,500 15,300 4,240 6,680 5,040 6,330 7,150 5,450

0.144 0.15 0.147 0.141 0.146 0.12 0.148 0.14 0.147 0.134 0.14 0.126 0.125 0.127 0.141 0.136 0.129

0.001 <0.001 0.002 0.004

16 20

17.8

4,870 4,780 3,790 4,730 4,590 5,020 4,500 4,600 4,660

5,780 5,860 5,820 5,520 5,740 5,950 5,710 4,600 6,120

0.001 0.001 0.001 0.003

0.006 0.005 0.006 0.003 0.003 0.004 0.003 0.004 0.005

16.3 18.3 17.8 16.3 16.6 19.1 17.5 16.7

<0.001 <0.001 0.001 0.004 <0.001

1.5

Table notes

shaded cells indicate results exceeding the WQO upper or less than the WQO lower Water quality objectives (WQO) are sourced from:

* Australian & New Zealand Guidelines for Fresh and Marine Water Quality, Default Guideline Values : 95% species protection level for freshwater * Queensland Department of Environment and Heritage Protection, September 2011, Environmental Protection (Water) Policy 2009, Dawson River Sub-basin Environmental Values and Water Quality Objectives. Basin 130 (part), including all waters of the Dawson River Sub-basin except the Callide Creek Catchment (zone 14)