1. 1

2. 2 Figure 6-1. Schematic of the Twin Butte tailings disposal area.

3. 3

4. 4 Figure 6-2. Geochemical fingerprint pattern for Twin Butte tailings leachate.

5. 5 Figure 6-3. Trace metal fingerprint pattern for Twin Butte tailings leachate.

6. 6 Geochemical Parameters Trace Metals

7. 7

8. 8 Fingerprint Match Figure 6-6. Trace metal fingerprint patterns in Twin Butte column eluant samples.

9. 9 Fingerprint Match, % Figure 6-7. Tailings leachate composition over time at Twin Butte Tailings Pond 3.

10. 10 Figure 6-8. Geochemical fingerprint pattern in Twin Butte Tailings Pond 3.

11. 11 Figure 6-9. Trace metal fingerprint pattern in Twin Butte Tailings Pond 3.

12. 12 Figure 6-10. Geochemical fingerprint at upgradient Well M-3.

13. 13 Figure 6-11. Trace metal distribution at upgradient Well M-3.

14. 14 Figure 6-12. Geochemical fingerprint at downgradient Well M-1.

15. 15 Figure 6-13. Trace metal distribution at downgradient Well M-1.

16. 16 Figure 6-14. Geochemical fingerprint pattern at Well M-2.

17. 17 Sampling Date Figure 6-15. Area plot of monitoring results at Well M-2. Fingerprint Match, %

18. 18 Figure 6-16. Monitoring results from downgradient Well 1225. Fingerprint Match, %

19. 19 Figure 6-17. Monitoring results from downgradient Well M-7. Fingerprint Analysis, Well M-7 Fingerprint Match, %

20. 20 0 20 40 60 80 100 Figure 6-18. Monitoring results from downgradient Well M-5. Fingerprint Match, %

21. 21 Figure 6-19. Monitoring results from downgradient Well 1758. Fingerprint Match, % 0 20 40 60 80 100