2001-04-20_REVISION - M1977342 - Laserfiche WebLink

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Mr. Allen C. Sorenson • • Henderson Mine, Permit No. M-77-342, Revision No. TR-8 Page 4 Prior to loading operations, the east side of the pond and access acres will require preparation. As seen in Figure 2, there are several obstacles that, while not presently blocking access, will require attention and protection. The concrete blockhouse and adjacent exposed underground piping will need to be protected from heavy equipment. Likewise the turn-out box seen in Figure 3 should be protected, thus allowing secondary access or an egress point from the east side of the pond. Once the ingress and egress points have been reconstructed, preparations can be made to set the conveyor and hopper system. The pond is bermed on all sides for stormwater management and to anchor the liner system. The berm along the east side is approximately 4 feet vertical and 8 feet from outer base to the interior pond edge (Figure 4). Initial loading operations should not require any major modifications to the berm or the loading area since the 60 foot conveyor extends 30 feet beyond the wheel base. Some ground preparation may be required for the hopper feed set-up. As loading proceeds from east to west, eventually the base of the berm will require fill to construct a ramp with grade suitable for equipment access onto the filled portion of the pond. 3.2 Equipment and Loading The principal equipment for loading HDS into Pond 1.2 is a portable 60 foot, 36" wide, vertically adjustable conveyor similar to the one currently being used at Henderson by Yenter (Figure 5). This system will require a suitable sized loading hopper for either dump loading or bucket loading. A generator set also is needed for operation. While only one unit will be needed initially - and may be the only one needed as operations proceed -these conveyors are designed to be easily linked as is typical in aggregate mining and sorting operations (Figure 6). HDS would be transported to the pond by small end-dump trucks capable of direct dumping into the hopper. An alternative approach might be to dump the HDS onto a lined holding area and campaign it into the hopper with a rubber-tired front-end loader. From the hopper, the HDS would be fed directly to the conveyor as in Figure 7 which would deposit the material directly into the pond beginning at the east edge. Since HDS contains no coarse materials and has a consistency of silty soil, damage to the liner by this manner of loading is considered unlikely. The loading process would be conducted by filling one point and moving from south to north or north to south along the east edge of the pond. Once a pass has been completed, the conveyor would be extended forward and the process repeated. The material would be encouraged to slump into the pond toward the west side. As filling progressed, an access ramp would be