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•~ <br />3.0 IiATERIAL6 AND BITE CONDITIONB <br />3.1 Mined rock <br />The mined rock will be development waste excavated from the deeper <br />half of the two tunnels. It is estimated that there is 11,000 <br />cubic yards of material between the two tunnels. This material has <br />been characterized by SK-3H, a horizontal hole approximately alone <br />the alignment of tunnel #1 (to the west). The log of this hole is <br />presented in Appendix 3.3-2. A summary of the log is: <br />DEPTH (FT) LITHOLOGY <br />0 - 150 Siltstone/sandstone, calcareous, <br />150 - 315 _ <br />Shale and black organic shale <br />315 - 395 Sandstone, calcareous, occasional <br />395 - 900 Shale, calcareous <br />900 -1050 Siltstone, calcareous <br />1050 -1215 Sandstone, calcareous <br />1215 -1300 Siltstone, calcareous <br />1300 -1310 Organic shale, black <br />1310 -1360 Coal <br />1360 -1380 Siltstone and shale <br />1380 -1401 Black shale (TD=1401 ft) <br />• ~. <br />trace pyrite <br />pyrite blebs <br />As can be seen, this hole exhibited the following relative <br />abundances of materials: <br />Sandstone/siltstone <br />Shale <br />organic shale <br />Coai <br />545 ft 39~ <br />675 ft 4S$ <br />130 ft 9~ <br />50 ft 4~ <br />-- There is only one coal seam identified in the core, and `,.his is the <br />seam to be mined. Accordingly, it is expected that approximately <br />half of the material that will be produced by the portal will be <br />arenaceous (sandstone and siltstone}, and approximately half will <br />be argillaceous (shale and organic shale). <br />The grainsize analysis of this material has been determined from <br />the existing pads. Two samples were excavated by hand, with the <br />larger boulders and rocks removed to facilitate samplinc. The <br />grainsize analyses are presented in Figure 1. Pit 2 and Pit 3 were <br />samples taken half way up the pad slope of Portal #1, from <br />approximately 12 inches below the pad surface. Both are coarse <br />material, with median sizes (of the material sampled and sieved) in <br />the gravel range. The expected hydraulic conductivities of these <br />materials can be computed using the Hazen formula to be around 1 <br />cm/sec, which is frees draining. It is expected that the material <br />will not significantly change in nature when the tunnels are <br />extended. <br />-' AQrian Brown Consultants -3- 1145/9005:1 <br />