2020-06-25_REVISION - C1981019 (6)

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RULE 2 PERMITS The sequence and timetable for all topsoil redistribution and revegetation activities is found on the Topsoil Handling Map (Map 28). The overall life-of-mine topsoil balance is estimated in Volume 1, Table 2.05-1. All yardage and acreage figures have beeb calculated based upon the assumption that topsoil would be removed in advance of mining activities as shown on Topsoil Handling Map (Map 28). Mine development into the South Taylor area required an initial boxcut, resulting in additional stockpiling of topsoil. The stockpiling of topsoil will continue until all pit development has progressed to its maximum extent. After mining and regrading operations have ceased, all stockpiled topsoil will be used to reclaim the pit disturbance. Topsoil will be stored in topsoil stockpiles as shown on Map 28A. Construction specifications for these stockpiles will follow all prudent regulations within this section (2.05.3(5)) and as follows. Stockpiles will be constructed with stable slopes and will be located to avoid erosion from wind and water and additional compaction or contamination. As can be determined from the Topsoil Handling Map (Map 28), all stockpiles are located within stable areas. The piles will be protected from wind erosion by planting a perennial mixture as explained in Section 4.06.3 as soon as conditions allow. Proper seasons of planting will be early spring or late fall. In addition to the planted material, a considerable amount of volunteer growth can be expected to grow on all stockpiled topsoil. External erosion will be controlled through proper location of the stockpiles. No topsoil stockpiles will be placed in a drainage bottom where external erosion might pose a potential threat. Unnecessary compaction will be avoided by keeping all but essential traffic off the stockpiled areas. Topsoil signs will identify topsoil stockpiles. Contamination of the stockpiles will be eliminated by the careful selection of sites that are distant from the areas where actual mining activities are occurring. Drainage ways and areas near spoiling and blasting will be avoided where possible. 2.05.3 (6) Overburden The complete description of the removal, handling and storage of all overburden material within the permit area is described under the Production, Methods and Equipment Section found at the beginning of Section 2.05.3. The spoil handling procedures and spoil monitoring plan parameters for the operation can be found on Section 2.05.3 of Volume 1. The mining sequence for the planned operation is shown on the Mine Plan Map (Map 23A). Cross sections showing the mining operation during the "steady-state" operation are found on the Mining Range Diagram (Map 2413). For the spoil disposal locations and volumes for both the East and West Taylor valley fills and the temporary overburden stockpile, please refer to Map 35A. The cross-sections that are associated with the design of the valley fills and the temporary stockpile can be found on Map 40A. Permanent Valley fill construction and design criteria is described in detail in Section 4.09. A temporary overburden stockpile will be built above the East Taylor valley fill. The spoil suitability and special handling procedures are described in detail in section 2.05.3(1). The initial development of the stockpile began in 2008 and completed in 2013. The temporary overburden stockpilewas constructed in 50 foot lifts by use of trucks, dozers and loaders. The side slope of the temporary overburden stockpile are generally at al.3H:1Vslope and will be maintained during active times of operation. Maintenance techniques consist of blading of roads and ramps, along with the use of dust control during active times of operation. Sediment control will be implemented to ensure adequate containment of potential runoff throughout the life of the operation. Following the completion of mining, this temporary overburden stockpile will be removed and placed back into the open pit. South Taylor/Lower Wilson—Rule 2,Page 72 Revision Date: 6/22/20 Revision No.: MR-220