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Coldarl~ssoelertss Ina 200 Union 8oulewrd. S~i(e 500 lnkewood. CO USA 80228 Rl~phan~ (3031980-0Sd0 Fac(303)985.2080 July 14, 1995 Colorado Department of Transportation Staff'Geotechnical Section 4340 Fast Louisiana Avenue Denver, CO Reference No.: 953-2900.007 RE: TAILINGS AND PAD N0.2 MIXTURE FOR HIGHWAY 67 STRUCTURAL FILL Dear Rick: Presctnly, the Cripple Creek & Victor Gold Mining Company (CC&V) is placing a fill in the azea referred to as Arequa Gulch, as part of the Highway 67 realigtunent. As disctused earlier with the Colorado Department of Transportation (CDOT), the Highway fill is being constructed with crushed rock that has been processed for metals recovery and well rinsed (referred to as Pad No. 2 material). The Construction Manager for this construction project, Ford, Bacon & Davis (FB&D), requested that Golder Associates Inc. (Golder) evaluate the potential use of a mixture of Carlton Tailings material and Pad No. 2 material as Structural Fill for the Highway 67 Realignment Fill. The volume of the Highway fill is estimated at approximately 750,000 cubic yazds. By being able to introduce a fraction of the approximately 1,000,000 cubic yazds of tailings that needs to be relocated from the Phase II Heap Leach Pad azea with the Pad No. 2 material as part of the Highway Fill, less tailings material would have to be placed in Upper Arequa Gulch, which has a finite storage capability. Representative samples of Cazlton Tailings material and Pad No. 2 material wen collected to obtain the consolidation characteristics fora 20 percent Carlton Tailings / 80 per cent Pad No. 2 mixture. Consolidation of a soil material generally occurs due to the following: 1. Deformation of the soil grains; 2. Compression of the air and pore water fluid in the voids; and 3. Squeezing out of the air and pore water fluid from the voids.