2009-06-08_REVISION - M1997032 ‎(24)‎

• Permit No: M1997032
• IBM Index Class Name: REVISION
• Doc Date: 6/8/2009
• Doc Name: EPP ‎(AM-01)‎ Attachment 6 & 7 of Attachment A ‎(part 4)‎
• From: Denison Mines
• To: DRMS
• Type & Sequence: AM1
• Email Name: RCO
• Media Type: D
• Archive: No

Ca/cu/afion Brief
Es111778110r' fPerco/afion Through Deue%pmenfRocIr Areas Using UNSAr/I
Table 2. Sensitivity analh sis o selec ed input parameters.
Simulation Site Precipitation ( m) Time Step
Control
Parameter
(DMAXBA) Initial Soil
Matric
Potential
(cm) Number of
Nodes Estimated
Percolation (cm)
1 Topaz 31 .41 0.001 1.00E-07 28 0.027463
2 West Sunday 32 .41 0.001 1.00E-07 28 0.032824
3 Topaz 50 .47 0.001 1.00E-07 28 0.028401
4 West Sunday 50 .47 0.001 1.00E-07 28 0.033676
5 Topaz 3 2.41 0.0001 1.00E-07 28 0.027463
6 West Sunday 3 2.41 0.0001 1.00E-07 28 0.032825
7 Topaz 5 0.47 0.0001 1.00E-07 28 0.028402
8 West Sunday 15 0.47 0.0001 1.00E-07 28 0.033676
9 West Sunday 50.47 0.0001 1.00E-05 28 0.033792
10 West Sunday 50.47 0.0001 1.00E-03 28 0.033765
11 West Sunday 5 0.47 0.0001 1.00E-05 111 0.026953
12 West Sunday 5 .47 0.0001 1.00E-07 111 0.026868
6.0 Conclusions
The UNSAT-h simulations sugE
development rock stockpiles is
estimated for all simulations. TI
precipitation followed by upwa
development rock areas are dor
percolation through the develol
characteristics of the developm(
as the magnitude of annual pre4
volume of percolation.
it that significant percolation from the base of the
likely. However, a small amount of percolation is
simulations further suggest that infiltration of
evaporative flux of water stored within the
lant mechanisms controlling the volume of
tent rock areas. Minor differences in the physical
t rock from West Sunday and Topaz mines as well
)itation are less important controls on the expected
The results of this simulation cc
development rock physical and
data. Site-specific climate data
mines, and differences between
compiled from the Uravan and
percolation through the piles. Ii
laboratory analyses of samples
predicted percolation rates. Ho'
facilitate inclusion of these largf
piles is controlled by the finer g
estimation of physical and hydi

•espond to the input parameters including the
ydrologic parameters, and the available climate
not available for the West Sunday and Topaz
ctual climate conditions at the site and the data
weather stations could result in variations in
addition, inclusion of cobbles and boulders in
rom West Sunday and Topaz mines may affect the
(ever, available laboratory instruments do not
particle sizes. Unsaturated flow through mine waste
ained particles (Swanson et at. 2000). Therefore,
)logical characteristics of the development rock based
T:\64986-Denison Mines\Task Order 3 - DMO Sampling and Analysis Plan\Task 3.12 - Soil, ?m, Rock Data Assessment Report\Unsat_h modelsVinal models\Final Report\calc brief.doc
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