Third national assessment
- Executive Summary
- 1.0 Introduction
- 2.0 Methods
- 3.0 Presence or Absence of Effects
- 4.0 Effluent Quality
- 5.0 Biological Monitoring Studies Investigating Observed Effects
- 6.0 Key Findings
- 7.0 Glossary
- 8.0 References
- Appendix A: Metal Mines Subject to the Metal Mining Effluent Regulations in 2013
- Appendix B: Effect Indicators, Critical Effects Sizes and Studies Conducted
- Appendix C: Mine-by-Mine Results of Studies Assessing Potential Effects
- Appendix D: Fish Tissue Mean Total Mercury Concentrations per Mine
- Appendix E: Trends in Sublethal Toxicity
- Appendix F: Trends in Sublethal Toxicity for Ore Types
- Appendix G: Annual Mean Concentrations of Effluent Characterization Data
- Appendix H: Mine-by-Mine Summary of Investigation Studies
Appendix F: Trends in Sublethal Toxicity (SLT) for Ore Types
Figure F1. Geometric mean IC25 (percent effluent on a volume basis) each year for each SLT test at precious metal mines
Description
Figure F1 is a line chart illustrating the annual geometric mean IC25 for each of five different sublethal toxicity tests conducted between 2003 and 2012 for precious metal mines. The annual geometric means for fish larval growth inhibition on Pimephales promelas are 75, 70, 93, 99, 100, 98, 96, 92, 97 and 95 and range in number of tests was 48-67. The annual geometric means for alga growth inhibition on Pseudokirchneriella subcapitata are 51, 57, 61, 66, 62, 68, 85, 79, 84 and 62 and range in number of tests was 51-72. The annual geometric means for plant growth inhibition on Lemna minor dry weight are 45, 46, 44, 66, 61, 59, 57, 47, 50 and 63 and range in number of tests was 50-68. The annual geometric means for plant growth inhibition on Lemna minor frond number are 25, 38, 30, 45, 35, 38, 35, 30, 38 and 40 and range in number of tests was 48-68. The annual geometric means for invertebrate reproduction inhibition on Ceriodaphnia dubia are 34, 35, 37, 45, 48, 48, 34, 53, 32 and 28 and range in number of tests was 52-69.
Note: Range in number of tests conducted per year in parentheses.
Figure F2. Geometric mean IC25 (percent effluent on a volume basis) each year for each SLT test at base metal mines
Description
Figure F2 is a line chart illustrating the annual geometric mean IC25 for each of five different sublethal toxicity tests conducted between 2003 and 2012 for base metal mines. The annual geometric means for fish larval growth inhibition on Pimephales promelas are 81, 82, 89, 81, 74, 82, 77, 86, 82 and 78 and range in number of tests was 39-59. The annual geometric means for alga growth inhibition on Pseudokirchneriella subcapitata are 50, 35, 41, 33, 60, 51, 51, 74, 81 and 60 and range in number of tests was 46-65. The annual geometric means for plant growth inhibition on Lemna minor dry weight are 46, 30, 44, 42, 36, 44, 32, 40, 28 and 43 and range in number of tests was 41-58. The annual geometric means for plant growth inhibition on Lemna minor frond number are 18, 18, 21, 19, 19, 26, 20, 17, 15 and 33 and range in number of tests was 39-61. The annual geometric means for invertebrate reproduction inhibition on Ceriodaphnia dubia are 23, 17, 23, 28, 26, 15, 15, 14, 15 and 24 and range in number of tests was 45-66.
Note: Range in number of tests conducted each year in parentheses.
Figure F3. Geometric mean IC25 (percent effluent on a volume basis) each year for each SLT test at uranium mines
Description
Figure F3 is a line chart illustrating the annual geometric mean IC25 for each of five different sublethal toxicity tests conducted between 2003 and 2012 for uranium mines. The annual geometric means for fish larval growth inhibition on Pimephales promelas are 96, 97, 100, 100, 100, 100,100, 100, 95 and 100 and range in number of tests was 7-15. The annual geometric means for alga growth inhibition on Pseudokirchneriella subcapitata are 82, 80, 80, 69, 54, 73, 85, 91, 75 and 91 and range in number of tests was 7-15. The annual geometric means for plant growth inhibition on Lemna minor dry weight are 23, 29, 24, 24, 26, 65, 78, 46, 61 and 97 and range in number of tests was 4-15. The annual geometric means for plant growth inhibition on Lemna minor frond number are 11, 16, 18, 8, 7, 30, 9, 7, 11 and 31 and range in number of tests was 7-15. The annual geometric means for invertebrate reproduction inhibition on Ceriodaphnia dubia are 22, 40, 42, 66, 12, 26, 37, 26, 33 and 34 and range in number of tests was 7-15.
Note: Range in number of tests conducted each year in parenthesis.
Figure F4. Geometric mean IC25 (percent effluent on a volume basis) each year for each SLT test at mines with “other” ore types
Description
Figure F4 is a line chart illustrating the annual geometric mean IC25 for each of five different sublethal toxicity tests conducted between 2003 and 2012 for other ore mines. The annual geometric means for fish larval growth inhibition on Pimephales promelas are 77, 74, 100, 89, 100, 88, 85, 100, 100 and 100 and range in number of tests was 5-11. The annual geometric means for alga growth inhibition on Pseudokirchneriella subcapitata are 82, 73, 61, 58, 30, 91, 62, 82, 62 and 78 and range in number of tests was 5-10. The annual geometric means for plant growth inhibition on Lemna minor dry weight are 33, 7, 18, 23, 14, 21, 22, 37, 19 and 8 and range in number of tests was 5-11. The annual geometric means for plant growth inhibition on Lemna minor frond number are 8, 9, 7, 12, 9, 24, 7, 10, 8 and 6 and range in number of tests was 5-10. The annual geometric means for invertebrate reproduction inhibition on Ceriodaphnia dubia are 27, 71, 37, 34, 15, 14, 18, 3, 9 and 12 and range in number of tests was 5-10.
Note: Range in number of tests conducted each year in parentheses.
Figure F5. Geometric mean IC25 (percent effluent on a volume basis) each year for each SLT test at iron ore mines
Description
Figure F5 is a line chart illustrating the annual geometric mean IC25 for each of five different sublethal toxicity tests conducted between 2003 and 2012 for iron ore mines. The annual geometric means for fish larval growth inhibition on Pimephales promelas are 46, 36, 21, 44, 21, 72, 91, 84, 100 and 72 and range in number of tests was 4-13. The annual geometric means for alga growth inhibition on Pseudokirchneriella subcapitata are 79, 62, 93, 7, 98, 84, 91, 91, 82 and 79 and range in number of tests was 4-14. The annual geometric means for plant growth inhibition on Lemna minor dry weight are 98, 25, 61, 98, 98, 97, 96, 80, 80 and 97 and range in number of tests was 2-10. The annual geometric means for plant growth inhibition on Lemna minor frond number are 26, 16, 11, 1, 8, 88, 92, 76, 82 and 83 and range in number of tests was 2-11. The annual geometric means for invertebrate reproduction inhibition on Ceriodaphnia dubia are 4, 2, 5, 15, 7, 30, 82, 84, 37 and 100 and range in number of tests was 4-12.
Note: Range in number of tests conducted each year in parentheses.
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