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<br />A schematic representation of the upstream placement method as illustrated by Vick: <br />sm'loll d T.ed;na; -- sw--•. 1... <br />p !A? <br />Decani I.eihilg5 diSChdrU+•' nI <br />(a) <br />Pe-i. is,.,,. <br />K;, <br />IN <br /> <br />(r) <br /> <br />0 <br />0 <br />W) <br />Figure 3.2 Sequential raising, upstream embankment. <br />Vick, Steven G. Planning Design, and Analysis of Tailings _Dams. Vancouver, B.C. Canada: <br />BiTech Publishers Ltd., 1990, p. 72. <br />Venture Resources has employed the expertise of TRI/Environmental, Inc, and Advanced Terra Testing, Inc. to <br />perform the necessary geotechnical laboratory work to examine the tailings' physical and engineering properties as <br />well as the interface relationship between the tailings, composite liner components, and the existing site conditions. <br />TRI's findings and reports can be found in entirety as an appendix to this Exhibit C. <br />Vick states in Planning, Design, and Analysis of Tailings Dams that the upstream method is particularly suitable <br />under the following conditions: <br />1. At least 40-60% sand in the whole of the tailings. This operation anticipates 541/o sand (see TRI's report on <br />dry mill tailing particle size analysis attached in the appendix of this Exhibit C). <br />2. Peripheral discharge and well controlled beach is necessary. This operation will utilize spigotting <br />discharge that can be adjusted to regulate embankment and beach formation. <br />3. Not suitable for significant water storage. This operation considers water an expensive operating medium <br />and must recycle readily and continually. Water is decanted from the ponding zone and collected from the <br />leachate sump. This recycled water is pumped to a Water Holding Pond above the Mobile Millsite for <br />storage. <br />4. Seismic resistance is poor. This operation is not in an area of any measurable degree of seismic activity. <br />5. Embankment raising rate less than 15-30 ft. per year most desirable, greater than 50 ft. per year can be <br />hazardous. This operation is well below this condition, averaging 10-12 ft. per year. <br />6. Embankment fill requirement of natural soil, sand tailings, or mine waste. This operation is processing <br />mine waste rock with a sand content of 54%. <br />Page 16 of 35