DERR-2024-007799

ZONE A REMEDIAL
ACTIVITIES UPDATE
Kelly Payne
Kennecott Utah Copper Corporation
June 16, 2004
TONIGHT’S DISCUSSION
•Effects of RO concentrate disposal to
KUCC tailings impoundment
•Preliminary 2004 Zone A monitoring
results
•Revised Zone A groundwater extraction
plan
•Zone A RO Plant update
•Acid water treatment update
CONCENTRATE FLOW
CONTRIBUTIONS TO TAILINGS SYSTEM
Tailings Water
35,000 gpm (96%)
Zone B Concentrate
600 gpm (2%)
Zone A Concentrate
600 gpm (2%)
Parameter
(mg/l)
Average
Tailings Water
2002
Typical
Zone A
Concentrate
Typical
Zone B
Concentrate Composite
Discharge (gpm)35,000 600 600 36,200
TDS 7,934 10,317 8,304 7,980
pH 6.97 7.30 7.57 6.99
SO4 4,103 5,971 3,100 4,117
Ca 716 2,054 1,500 751
Cl 1,623 680 920 1,596
K 142 19 18 138
Mg 510 620 540 512
Na 940 294 500 922
Al 0 <0.010 <0.125 0
As 0 0 <0.02 0
Cd 0 <0.001 <0.0025 0
Cu 0.155 0.027 0.022 0.151
Mn 12 <0.010 <0.01 12
Pb <0.005 <0.005 <0.0025 <0.005
Se 0.042 0.014 0.020 0.041
Zn 0.054 0.022 <0.025 0.053
WATER CHEMISTRY COMPARISON
250
250
5000
20,0
0
0
1500
5000
20,00
0
LEGEND
1996 SO4 CONTOUR
DECREASE IN SO4
CONTOUR 1996 TO 2004
INCREASE IN SO4
CONTOUR 1996 TO 2004
DECREASE IN SO4
IN WELL*
INCREASE IN SO4
IN WELL*
NO 2003 DATAOR
PRODUCTION WELL
NOTE:
Values in blue are 2004 data, values in red
are 2003 .
*In multiple completed wells, completion
with the highest SO4 concentration in 1996
was used. Other completion data was used
in the drawing of chonge contour.
In general 1996 and 2004 data was used. In
some cases wells were not installed until
1997. In this case wells are marked with
(97).

15
0
0
PREL
IMIN ARY —SUBJ
E
C
T

T
O

R
E
V
I
S
I
O
N

W
H
E
N

A
D
D
I
T
I
O
N
AL DA
TA AV
A
I
L
B
L
E
ZONE A REMEDIAL
EXTRACTION PLAN
•Planned annual extractions:
–Barrier Wells/RO Feed:4670 afy
–Acid Wells:2020 afy
ZONE A REMEDIAL
EXTRACTION PLAN
0
400
800
1200
1600
2000
2400
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
A
n
n
u
a
l
A
c
i
d

E
x
t
r
a
c
t
i
o
n
Minimum Required
Extraction
Proposed Extraction Rate
YTD
ZONE A RO PLANT UPDATE
•Operation of Phase 1 (1,500 gpm) was
started in September 2003
•Detailed Design of Phase 2 is in progress
(70% complete)
•Conditional Use Permit was obtained
•Building Permit has been obtained
•Application for System Number was
submitted to the Division of Drinking Water
ACID WATER TREATMENT UPDATE
•Acid Well #2 began pumping in August
2003
•Current projections suggest excess
neutralization potential in tailings through
early 2007.