Laserfiche WebLink
Technical Memorandum ■ <br /> Cripple Creek&Victor Gold Mine ■ <br /> SGVLF Stability Evaluation—Nonagglomerated Tailings <br /> NewFields Job No.475.0106.009 <br /> 1 June 2017 <br /> TABLE 2—ATTERBERG LIMITS <br /> Atterberg Limits <br /> Sample Type Tested By Plastic Liquid Plasticity <br /> Limit Limit Index <br /> Ore 1(Cresson) NewFields 20 30 10 <br /> Ore 2(WHEX) NewFields 17 37 20 <br /> Flotation Tailings NewFields Nonplastic <br /> Concentrate NewFields 23 37 14 <br /> Tailings <br /> 2.3 Shear Strength <br /> Direct shear tests were performed on both virgin ore samples and composite samples of ore <br /> and nonagglomerated tailings. An 8-inch shear box was used for testing, and particles larger <br /> than 3/4-inch were screened from the ore samples and replaced with finer gravel prior to test. <br /> The sample was inundated and allowed to consolidate before shearing at a rate of 0.01 inches <br /> per minute. Normal loads applied for the testing were 2.5, 5, and 10 ksf. Testing was <br /> continued until approximately 15 percent strain was achieved. The strength of each sample <br /> was interpreted at 15 percent strain, which is approximately at peak shear stress. The <br /> combined tailings sample was tested using the consolidated-undrained triaxial compression <br /> test. Results from the shear tests are presented in Table 3. <br /> TABLE 3—SHEAR STRENGTHS <br /> Effective Friction Average Effective <br /> Sample Type Angle(Degrees) friction Angle <br /> (Degrees) <br /> Ore 1 (Cresson) 40.31 <br /> 40.2 <br /> Ore 2(WHEX) 40.11 <br /> 90%Ore 1/10% Nonagglomerated Tailings 40.21 <br /> 39.2 <br /> 90%Ore 2/10%Nonagglomerated Tailings 38.21 <br /> Combined Tailings 36.4 -- <br /> 1 Failure tangents drawn at 15%strain with a zero cohesion intercept. <br /> Average friction angles of Ore 1 and Ore 2 were estimated due to an approximate equal ratio of <br /> Cresson and WHEX ore planned for placement in the SGVLF during the year of 2017. Results <br /> Page 3 <br />