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Climax Mine <br />Robinson Tailings Revegetation Project Summary <br />May -October 2005 <br />Climax Mine made aggressive progress in capping and reclaiming approximately 165 acres on <br />the Robinson tailing pond and adjacent areas during the 2005 season. Climax also completed <br />capping nearly 100 acres of the remaining Robinson tailings, however, no reclamation activities <br />were initiated due to the late date of completion. In the past, capping of the Robinson tailings <br />has been completed by hauling waste rock overburden materials and placing them on dry <br />tailings. Construction of the east side channel and hauling cirque and other overburden materials <br />from and adjacent to the pit resulted in a variety of capping materials being used on Robinson. <br />These capping materials included waste rock placed prior to 2005, cirque material from above <br />the pit, E-Dump, brown and dark grey waste rock materials from the pit and Maroon formation <br />materials from the east side channel excavation. Climax performed chemical analyses including <br />pH, fertility and lime requirements on these various capping materials to determine the <br />amendments required for successful reclamation. The aerial extents of each of these capping <br />materials were surveyed to determine amendment amounts of agricultural lime, quick lime, <br />fertilizer and biosolids and are shown on Map 1, The amendment treatments, acres and <br />application rates are detailed in Table 5. <br />Liming rates were determined by historical and current chemical analysis of the cap materials <br />using Sobek's EPA acid base accounting methodology. Results from the historic analyses of the <br />original waste rock cover and E-Dump materials determined that amendment with 24 tons of <br />agricultural lime and b tons of quick lime was required on a per acre basis. The cirque material <br />required amendment with 10 tons of agricultural lime and the Maroon, brown and grey materials <br />required no lime amendments. Fertility analysis results determined that 100 pounds pet acre of <br />11-52-0 was required. Both lime and fertilizer were applied prior to seedbed preparation which <br />included two-pass ripping to a depth of 6 inches at a 45 degree angle. <br />Biosolid application is an integral key to reclamation success at Climatic. Class A composted <br />biosolids and Class B biosolids were continued to be produced and used during 2005 to provide <br />organic material to the Robinson tailings cap materials. Class B biosolids were mixed at a ratio <br />of approximately 1 part wood chips to 1 part biosolids. This mixture was applied to 14.8 acres of <br />waste rock cover at an average depth of 4 inches for an application rate of approximately 400 <br />yards per acre (Table 5). This biosolid treatment was applied prior to seedbed preparation which <br />included two-pass ripping to a depth of 6 inches at a 45 degree angle. The Climax seedmix was <br />broadcast seeded onto the prepared seedbed at 25 bulk pounds per acre. <br />Class A biosolids were mixed at a ratio of approximately 1 part wood chips to 1 part biosolids <br />and 1 part previous composted biosolids and then composted. Class A biosolids compost was <br />screened to remove rocks and large woody material and spread with an aerospreader at a rate of <br />45 yards per acre on approximately 110.45 acres (Table S). Due to the application rate of 45 <br />yards per acre, ripping and seedbed preparation was completed prior to biosolid application. The <br />remaining Class A biosolids compost rejected by the screening operation was applied to 9.43 <br />