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:.0 ?SATERIALB AND 82TE CONDI"_'ION$ <br />• '::' <br />-- ~ 3.1 Mined rock <br />The mined rock vill 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 SR-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) <br />-- 0 - 150 <br />150 - 315 <br />- - 315 - 395 <br />395 - 900 <br />900 -1050 <br />1050 -1215 <br />121s -1300 <br />1300 -1310 <br />1310 -1360 <br />1360 -1380 <br />1380 -1401 <br />LITHOLOGY <br />_ Siltstone/sandstone, calcareous, <br />Shale and black organic shale <br />Sandstone, calcareous, occasional <br />Shale, calcareous <br />Siltstone, calcareous <br />Sandstone, calcareous <br />Siltstone, calcareous <br />Organic shale, blac?: <br />Coal <br />Siltstone and shale <br />Black shale (TD=1401 ft) <br />trace pyrite <br />pyrite blebs <br />"~ = A5 can be seen, this hole exhibited the following relative <br />• '.^ abundances of materials: <br />Sandstone/siltstone 545 ft 39~ <br />- - --- =-- Shale 675 ft 48$ <br />-.. - .. .. Organic shale 130 ft 9$ <br />- '-=... Coal 50 ft 4~ <br />-- ~.= There is only one coal seam identified in the core, and this is the <br />=-= - - seam to be mined. Accordingly, it is expected that approximately <br />half of the material that will be produced b}• the postal will be <br />arenaceous (sandstone and siltstone), and approximately half will <br />be argillaceous (shale and organic shale). <br />• _,~ <br />The grainsize analysis of this material has been deterained fros <br />the existing pads. Two samples we_-e excavated by hand, with :3e <br />la."cer boulders and rocks removed to facilitate samplinc. The <br />crainsize analyses are presented in Fiau~e 1. Pit 2 and P_t 3 were <br />samples taken half way up the pad slope of Porral #1, froW <br />approximately 12 inches below the pad surface. Both a_-e coarse <br />material, wi`,.Y. median sizes (of the material sampled and sieved) in <br />'.he gravel range. The expected hydraulic conductivities of ~~hese <br />materials can be computed using the Hazen formula to be around 1 <br />cm/sec, which is free draining. It is expected `..hat ~-he material <br />will not significantly change in nature when the tu.-uieis art <br />extended. <br />Adrian Brown Consultants -3- <br />:155/90C::1 <br />