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Mountain (',oal Company -West Eik Mine <br />Sylvester Gulch Road Geotechnical Investigation <br />Seismic Refraction Survey <br />Summary of Operations <br />44+00 <br />Seismic refiaction results reveal a second layer of higher velocity material which occurs nearly parallel to <br />the surface at an average depth of 22 few (Figure 25). The verity of the first layer is typical of <br />unconsolidated sediments. Velocities for the second layer indicate highly weathered bedrock. <br />Syyvester Gulch Se[srNC Line 44+00 <br />73m <br /> ~, <br />SM <br />NE <br /> ~ ~ <br />73w __ ~ _ ... .. . .. ........ ......_ .. _ _. _ ._...... <br />. . _. _._. . <br /> ~ <br /> ~ ~ <br />7320 _._m_ .. ____ ..__._- . ......... ... ___ .._.. my .--_ _. ......... <br /> W ~ <br /> pE <br />~ <br />7310 . _... <br />- _ ._..~_._ .gip. ... .... .. ......._.. _.. oy <br />.___... <br />C ~ <br />e us <br />os <br />73w .,.._ ...._ ~. _.._ ... <br /> pD <br />7291 __... .. ..._ _. OP. ~. VYB .. ._. __. _ .. <br />72w .. .. _ . - --- - W-= 1300fOs. <br />7270 -.-G7ound Sia6ce ~ = 52751t/s <br /> <br />7260 ~LirnaWary 1 <br /> <br />-w -zo -to o m zo 30 4o w w 7o w w ta0 110 tzo 130 tw tw tw 17a tw tw 2m 210 <br />OLTiEC! tro <br />Frgare 25. Seismic refraction profile of 44+00. <br />45+00 <br />• A three layer pro51e best describes the data from the seismic refraction line at 45+00 (Figure 26). The <br />velocities of the 5rst and second layer are typical of unconsolidated sediments. Velocities for the second <br />layer indicate tighter sedimems. Velocity resuhs from the seismic refraction for the third layer is that of <br />bedrock and is close to known velocities for some competent sandstones. <br />Syyvester Gulch Seisms Line 45+00 <br />7370 <br /> ~" NE <br />~ Ground Surface <br />7360 .. _ <br /> -BouMaryl ~ <br />7~ <br /> -Boundary 2 ~, <br />7340 - ~ - - - .. ..... .... .. .. .. <br />-- <br />98 <br /> <br />7330 <br />C <br />Vt =goo fr/S ua <br />A7320 ~ .. .......__... 0M ~ _. ____ .. ... <br /> <br />7310 ~~M QB <br />__ _ <br />~ <br />~ ~ <br /> ~ = tt15Q ftls <br />41 94 96 <br />e ~ ~ <br />73w g <br />.... _.. . . _ __-_ - _. __. __. _- - . <br />7zw _ __.._ _. V3=705oR/S <br />T2w _. _. .. .. ..._. .. ._. ... _ . <br />7270 .... __ ___ ..... .... _.. ... .. .._. <br />72w <br />D 70 m 30 4D 50 w 70 w 91 tw 110 120 13D 140 15D 1w 170 1w 191 20D 210 220 230 24D 250 2w 27 0 <br /> alstence tro <br />Figure 26. Seismic refraction profile at 45+00. <br />• <br />UMS, Inc. Page 17 05/17/03 <br />