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<br /> Job#: Calc by: M. Nelson
<br />Client: Denison Mines Checked by: M. Smith Date: March 11, 2009
<br />USA Corp.
<br />Project: Sunday Mines Date: March 31, 2009 Calc No.
<br />-Group Rock Report
<br />Detail: Estimate of Reviewed: Revision:
<br />percolation through Date: Date:
<br />Development Rock
<br />Areas
<br />Calculation Brief Title:
<br />Estimation of Percolation through Mine
<br />Rock Stockpiles Using UNSAT-H
<br />1.0 Purpose/Objective
<br />The purpose of this calculation is to estimate percolation through the Sunday Mines
<br />Group development rock areas using UNSAT-H (Fayer 2000). UNSAT-H is a fortran-
<br />based model that is used to simulate the one-dimensional flow of water, vapor, and
<br />heat in soils. The code addresses the processes of precipitation, evaporation, plant
<br />transpiration, storage, and deep drainage.
<br />• 2.0 Procedure
<br />• Estimate physical and hydrological characteristics of development rock using site
<br />specific sampling and laboratory analyses.
<br />¦ Compile climate data from locations as close as possible to the site.
<br />¦ Estimate percolation through development rock areas using UNSAT-H.
<br />3.0 References/Data Sources
<br />Advanced Terra Testing (ATT), 2009, Laboratory data for soil water characteristic curve,
<br />saturated hydraulic conductivity, grain size analyses, and moisture content. These data were
<br />developed from samples collected at the West Sunday Mine in August, 2009.
<br />Benson, C., 2006, An Introduction to Water Balance Modeling, in: Benson, C., Albright, B.,
<br />Rock, S., Valceschini, R., Waugh, J., Alternative Covers for Landfills, Waste
<br />Repositories, and Mine Wastes Workshop, November.
<br />Fala, O., Molson, J., Aubertin, M., Bussiere, B, 2005, Numerical Modeling of Flow and
<br />Capilary Barrier Effects in Unsaturated Waste Rock Piles, Mine Water and the
<br />Environment, Vol. 24.
<br />Fayer, M.J., 2000, UNSAT-H Version 3.0: Unsaturated Soil Water and Heat Flow Model
<br />Theory, User Manual, and Examples.
<br />• =M 1-1
<br />Document Code
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