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1 1 1 1 1 LJ AMENDMENT OF CONDITIONAL USE MINING PLAN REVISION The TR will do three things, it will combine 8 stage into 1, and change the maximum disturbance allowed. It will also remove the phasing from the reclamation timetable. What this TR, WILL NOT DO, is change the reclamation plan, increase the affected lands or change the general direction of mining. We have recalcu- lated the bond to reflect the increase in disturbed area under these revisions. Please ref er to the Revised Mining Plan Map attached for the areas discussed in this change. BACEGROOND In 1979 when the original application was approved it limited the stage sizes to keep the bond amount low. In 1990 a portion of the pit was leased to Aggregates, Inc.. when they move into the pit it became evident that Stage I and 908 of Stage II has been eroded by the river. This reduced the mined area and forced them to start mining in Stage IV and work west into Stage iII to establish the setback along the river. In November of 1991 Aggregates, inc. was awarded a large contract for airport material and once hauling starts for that contract we will need to disturb more area than we currently have bonded. Review of the Revised Mining Plan Map, attached, shows the river has encroached into the area that was to be mined. Compar- ing the Revised Mining Plan map with the original Mining Plan map shows the new location of the river and the changes this has caused to the area to be mined. In addition to the west side changes, the northern parts of Stages iII to V were also affected by the river change. The river has taken approximately 17.03 acres of area that was within the original mined area. STAGING CHANGE At the current time there are 8 Stages/Phases varying in size from 28.26 to 10.73 acres t• Because of the demand for material placed on this pit, the smaller stages are too restrictive and reduce the efficiency of the mining operation. We are removing the staging entirely and going to a maximum disturbance type of bonding. As in the original permit, mining started on the west side of the property and will continue to the east. Combining the stages into a single large stage allows more flexibility. The Permitted acres are unchanged and will remain at 168.41 ac. t. Comparing the totals of each column in the new Timetables with those in the old Timetables, shown on pages 10 and 18 in the original application book, will show the differences caused by the river. ' INCBEASED AREA OF DISTORBANCS The existing bond is based on the premiss that during the life of the mine, reclamation exposure will be largest when Phases VII, VIII and P are totally disturbed and Phase VII is ' partially stripped and mined. Under the new plan there will be a 25.00 acres t plant site and 25.00 acres t of area with some form