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<br />Drill Nole Logs. Drill hole logs which have been utilized in the <br />analysis of the overburden and geologic conditions present at the <br />GEC Minerals existing mine are shown in Exhibit 13. The location <br />of each drill hole is presented on Map No. 5. <br />Physical Properties. The overburden material which GEC Minerals, <br />Inc. currently removes as part of the mining operation consists of <br />shale, siltstones, and sandstones. Generally, the shales tend to <br />exhibit lower strength factors than do the sandstones or siltstones. <br />Therefore, during the excavation, haulage and backfill operations, <br />it is expected that the shale material will break up, while the <br />sandstone material will remain in relatively large boulders. The <br />overburden swell factor which is currently being encountered by the <br />GEC Minerals, Inc. operation is approximately 30%. Compaction <br />which is utilized in the backfill material is approximately 90~ for <br />an overall swell factor of approximately 17q over the original <br />• in-place material. The effect on the elevation of the backfill as <br />compared to the elevation of the original ground surface can been <br />seen in the Mine Plan Cross Section, Map No. 16. <br />Chemical Analyses. GEC Minerals, Inc. has thoroughly analyzed <br />numerous drill cores within the area which it plans to mine in the <br />next five years. These analyses are shown in Exhibit 5. No toxic- <br />formin9 or acid-forming materials have been located within this <br />strata. <br />• <br />2.04-13 <br />