TABLE 1.

Groundwater chemistry of fracture fluids collected in boreholes on the 7150 and 7025 levels at Henderson Mine

Parameter or species (unit)	Valuea for sample (mo/yr):
	7150-D1 (11/05)	7025-D1 (3/06)	7025-D4 (3/06)	7025-P1 (3/06)	7025-P4 (3/06)
O2 (%)	NM	3.75	55	1.4	0.4
O2 (μM)	NM	8.13	118.13	4.38	1.25
Temp (°C)	40	38.4	35.3	39.6	35.4
pH	5.85	5.9	6.28	5.82	5.95
DIC (mM)	NM	28.9	32.0	15.7	20.3
DOC (mM)	NM	0.05	0.05	0.03	0.03
Total N (mM)	NM	0.118	0.42	0.05	0.22
Organic N (mM)	NM	0.055	0.18	0.005	0.011
NH4+ (mM)	NM	0.009	0.113	0.005	0.112
Anions (mM)
Cl−	0.15	0.11	0.14	0.1	0.14
F−	12.4	0.71	1.49	0.7	1.3
SO42−	47.5	4.33	10.4	4.0	9.8
PO42−	BD	BD	BD	BD	BD
NO3−	NM	0.021	0.072	0.017	0.047
NO2−	NM	0.032	0.048	0.027	0.046
Major cations (mM)
Si	0.05	0.89	0.8	0.77	0.65
Mn	21.02	0.62	2.72	0.66	2.84
Fe	1.46	0.01	0.001	0.13	0.075
Mg	1.29	0.4	0.73	0.39	0.71
Ca	8.67	3	5.21	2.97	4.93
Al	4.78	0.06	0.26	0.66	0.27
Sr	0.04	0.014	0.03	0.014	0.03
Na	7.93	5.89	9.3	5.9	8.6
Li	NM	0.05	0.06	NM	NM
K	1.06	1.02	1.3	0.93	1.23
Trace elements (μM)
V	BD	0.01	BD	BD	BD
Ni	1.45	0.17	0.5	0.21	0.51
Cu	0.26	0.04	0.05	0.17	0.25
Zn	2859	31.87	153.52	35.44	154.3
As	0.04	0.06	0.02	0.1	0.03
Rb	1.5	2.96	3.96	3.3	4.56
Sr	18.7	12.8	25.03	14.17	25.05
Mo	0.02	0.07	0.05	0.02	0.054
W	0.005	0.01	BD	0.001	0.001
Stable isotopes
δ2HVSMOW (‰)	NM	NM	NM	NM	−133.55
δ18OVSMOW (‰)	NM	NM	NM	NM	−16.812
Carbon
14C (%)	NM	NM	NM	NM	3.54 ± 0.07
δ13C (‰)	NM	NM	NM	NM	−6.0

^aNM, not measured; BD, below detection.