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Mining Plan <br />MATERIAL PROCESSING . <br />Processing System: The processing of the mined rock involves crushing and screening. <br />This is done at the: processing plants, of which there currently are two. The primary plant is <br />located toward the north end of the operation and west of the shop. The smaller rip r.ap plant <br />is located below tt-e quarry backwall and more or less in the middle of the operation along a <br />north-south line. <br />Rock is hauled from the mining location to the respective plant where it starts through <br />the process of being crushed and sorted to produce the many products distributed from this <br />operation. No rock washing occurs at this operation. <br />Proportions of Product and Waste: In the processing of the rock a certain amount of the <br />material that enters the plant cannot generally be used as a product. This is called waste. The <br />amount of waste produced varies from a low of about 30% to 35% for very hazd rock to a high <br />of about 50% to S:i% for softer rock. On the average about 40% to 45% of the initial volume <br />that starts through the processing ends up as some kind of waste product. <br />Disposal 01' this waste is often a problem in these kinds of operations. In the past, • <br />considerable effort was made to sell as much of this waste as possible. <br />Under this plan, keeping as much waste as possible on site becomes important because <br />of the large volume of waste needed to backfill benches and especially to backfill the <br />overexcavation Hole. Calculations of waste production from future mining show that there <br />should be sufficient waste produced to accomplish the reclamation. in fact, there may be a slight <br />excess when total waste production is considered. Therefore, in the future little waste will be <br />sold from this operation as it will be needed to implement the reclamation. If there is a slight <br />excess of waste at the end of the operation that excess will allow creating slightly different <br />topography than is currently projected, but those differences will not amount to much of a <br />change. The final elevations may be slightly higher in some places than predicted or the <br />boundaries between steep slopes and gradual slopes will be made more gentle. Retaining this <br />waste for reclamation is effectively a loss of product sales for the company. <br />Stockpiling Operations: Stockpiling usually occurs near the processing plant. This <br />reduces costs by avoiding a need to haul the rock to another location for distribution. However, <br />on occasion, for very large orders, other stockpiles are created at various locations throughout <br />the operation. These aze usually short term storage areas that, at least temporarily, are more or • <br />less out of the wavy. These stockpiles are always placed on land that either has ah•eady been <br />Page 26 Pikeview Quarry Amendment Exhibit D <br />