Figure I Generalized map of the Wilbur Mining ... - University of Utah

to test the variation of water chemistry with
tirae. Tanperature measurements and water samples
collected at each sampling site were taken as
close to the source as possible and at the same
location throughout the sampling period. Temperatures
were measured with an Extech 1200 digital
thermometer. The pH was determined in the
field on an unfiltered sample with a Photovolt pH
meter 126A.
Water samples collected for chanical analysis
were analyzed for Si02, Na"*", K^, Ca"*^, Mg"''^, and
Li'*' on a Varian 1250 Atomic Absorption. Spectrophotometer.
F~, Cl", and SO^^ were analyzed on a
Dionex 10 Ion Chromatograph. Total dissolved
solids were deteraiined on filtered uncreated samples
by the residue-on-evaporation method (Rainwater
and Thatcher, 1960).
GEOCHEMISTRY OF THERMAL AND NON-THERMAL WATERS
The thermal waters (Group I) are a sodiumchloride-sulfate
type. .The waters have relatively
high concentrations of Si02, Li"*", and F" and
Satkln et al.
low Mg (Table I). In contrast, the non-thermal
waters (Group II) are enriched in Ca"*"*", and Mg"*^
and have lower concentrations of SiOo, Li"*", and
Within the non-thermal group of waters a subgroup
of waters (Group III) can be distinguished
by their high salinity. Both Casa Rosa and Dripping
Springs are highly enriched in Na"*", Ca'*^, Li'*;
C1-, and S0/;°. It is possible that these waters
follow a different hydrologic flow pattern. They
may derive their high salinity from, dissolution
of limestones and evaporites that crop out 20 km
to the west. A heavy isotopic signature may confirm
this suggestion.
The measured surface temperature at Castle
Hot Springs ranges between 47.6°C and 55.4''C with
a flow rate of 1300 l/min (340 gal/min). The
springs were sampled periodically (3-4 week intervals)
to test the variation of chemistry with
time. It is evident from the chemical analyses
listed in Table II that there has been no significant
change in the main spring systan's chemistry.
Table 2, Chemical variation through time at Castle Hot Springs, Arizona. Analyses in ppm (mg/l).
Date
Temp. °C
pH
K
C^tt Mg^
Li^
F
Cl"
'%
400T
"§ 300
a
o.
200
lOO
0
10/9/79
51.3
7.60
59.70
209.08
4.98
30.33
2.36
n.d.
8.50
147
212
10/24/79
55.4
7.65
63.48
208.75
5.49
34.04
2.99
n.d.
9.16
155
230
Note: n.d. - not deterrained
o o
m
Ca"*^ (ppm)
11/27/79
54,7
7.85
61.27
208.03
5.42
32,42
2.32
0.34
8.45
145
211
Group III
Group II
Figure 2. Water chemistry Ca"*"^ versus SO^.
o
12/20/79
52.7
7.75
60.27
210.89
5.50
31.89
2.63
0.33
8.70
141
211
179
1/9/80
53.4
7.70
58.68
195.27
5.55
29.46
2.37
0.32
8.53
140
206
1.2T
0.9
0.6
0.3
»
2/3/80
52.1
7.85
59.37
199.64
5.35
29.78
2.32
0.31
8.61
141
200
3/7/80
49.3
7.80
61.79
202.12
5.61
29.52
2.41
0.31
8,47
138
196
Group I
Croup II
4/10/80
47.6
7.85
62.01
221.56
5.39
31.07
2.43
0.30
8.31
140
189
Group III
o
o
Cl" (ppm)
Figure 3. Water chemistry Cl" versus Li
5/12/80
47.7
7.85
62.25
202.93
5.54
31.46
2.50
0.32
8.64
143
206
o