Acid mine drainage biogeochemistry at Iron Mountain, California

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.

Sample name	Date	T(°C)	pH	Total H⁺	Fe²⁺	Fe³⁺	Fe_T	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

ISSN: 1467-4866