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Table II 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.

From: Acid mine drainage biogeochemistry at Iron Mountain, California

Sample name Date T(°C) pH Total H+ Fe2+ Fe3+ FeT Eh (mV) Cu Zn SO42
99IM25-way May-99 45 0.71 740 344 31 375 708 6.2 22.4 786
OOIM15-way June-00 36 0.60 761 159 23 182 720 3.2 19.4 743
01IM15-way January-01 29 0.84 558 64 165 229 794 2.0 16.5 657
02IM15-way March-02 42 0.83 587 297 20 317 700 4.0 14.3 684
99IM2A1 May-99 38 0.85 566 360 27 387 703 6.4 16.4 824
OOIM1A1 June-00 38 0.60 688 107 9 115 705 3.1 11.5 606
01IM1A1 January-01 30 0.89 441 81 177 258 790 2.1 11.3 560
02IM1A1 March-02 42 0.83 579 269 50 319 727 4.1 14.0 665
99IM2B1 May-99 38 0.52 1167 380 41 420 713 5.4 27.9 1161
OOIM1B1 June-00 31 0.60 1000 209 61 271 738 3.5 25.3 1020
01IM1B1 January-01 27 0.75 715 55 257 312 810 1.4 25.5 929
02IM1B1 March-02 47 0.78 582 261 13 274 692 2.2 16.8 550
99IM2C1 May-99 48 0.76 805 372 30 403 705 6.0 26.8 1020
OOIM1C1 June-00 44 0.60 858 170 25 196 721 3.3 23.8 756
01IM1C1 January-01 32 0.85 503 47 195 243 806 2.0 24.1 635
02IM1C1 March-02 50 0.76 800 281 7 288 676 4.7 14.3 651
02IMM B-back March-02 45 0.83 544 240 1 241 638 2.3 17.2 586
02IM1 C-back March-02 50 0.82 583 274 12 286 689 4.5 14.2 656
00IM1 A-slump June-00 32 1.10 190 26 21 46 764 0.9 1.3 149
01IM1 A red pool January-01 30 1.38 115 10 25 35 793 0.3 2.7 142
02IMM A-back March-02 42 0.83 675 363 16 380 690 6.0 18.4 892