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The capacity and rate of fill for the Tailings Impoundment has been summarized:
<br />Table 2
<br />Tailings Impoundment
<br />Capacity
<br /> Totals Operating Duration @
<br />80 ton/day (months) Total
<br />Bench Zone (10'
<br />step lifts Cu. Yds. Tonnage* Cu. Yds. Tonnage Months
<br />Barrier Top of Dam 6,078 9,117 6,078 9,117 3.8 3.8
<br />Bench 1 Step 1 10,081 15,122 6.3
<br /> Step 2 12,893 19,339 8.1
<br /> Step 3 18,713 28,069 11.7
<br /> Step 4 17,444 26,167 59,131 88,697 10.9 37.0
<br />Bench 2 Step 5 16,674 25,011 10.4
<br /> Step 6 18,967 28,450 11.9
<br /> Step 7 20,965 31,447 13.1
<br /> Step 8 23,074 34,611 79,680 119,519 14.4 49.8
<br />Bench 3 Step 9 21,861 32,792 13.7
<br /> Step 10 23,370 35,056 14.6
<br /> Step 11 25,263 37,894 15.8
<br /> Step 12 27,296 40,944 97,791 146,686 17.1 61.1
<br />Bench 4 Step 13 26,167 39,250 16.4
<br /> Step 14 28,824 43,236 18.0
<br /> Step 15 30,726 46,089 19.2
<br /> Step 16 33,185 49,778 118,902 178,353 20.7 74.3
<br />Bench 5 Step 17 31,156 46,733 19.5
<br /> Step 18 32,830 49,244 20.5
<br /> Step 19 33,133 49,700 97,119 145,678 20.7 60.7
<br />
<br /> Totals 458,700 688,050 286,7
<br /> (months)
<br />' Tonnage figured at 1.5 ton/cu. yd. 23.9
<br /> (years)
<br />?uomposite Lmer aystem:
<br />The DRMS has determined that practice based ground water protection be applied to this operation through the
<br />implementation of a composite liner system under the Tailings Impoundment.
<br />Venture Resources has sought the expertise of Colorado Lining International in specifying the necessary
<br />geosynthetic products suitable for this application. A three component system is specified consisting of a
<br />Geosynthetic Clay Liner (Bentomat Dl), overlain with a textured 60 mil HDPE Geomembrane impervious liner,
<br />overlain with a GeoComposite drainage layer and incorporating a network of "French drains". Specification sheets
<br />of the liner components have been included as an appendix to this Exhibit C.
<br />The Geosynthetic Clay Liner (GCL) shall be placed directly on the base grade as the first layer. The GCL provides
<br />for a secondary, self-healing liner that will contain any slight seepage that may occur through the Geomembrane.
<br />The GCL also allows for a cushion between the base grade and the Geomembrane, mitigating chances of a rough
<br />surface from puncturing through to the Geomembrane. This liner is composed of a geosynthetic fabric "pillow"
<br />with bentonite clay sandwiched between. In the event moisture permeates, the bentonite clay will swell to seal.
<br />Refer to the Composite Liner Submittal in the appendix for specifications pertaining to sub-grade preparation and
<br />installation utilizing an anchor trench method.
<br />Page 27 of 37
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