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Subsidence and Geologic Field Observatbns <br />Apache Rocks and Box Canyon Mining Areas <br />July 12-15, 2004 <br />4.4.3 Location 19 <br />7hi; uirservation point is located un the uurth stde ut the North i'urk of the Guanisuu Iti~er. <br />• Numerous landslides arc present in the ailluviunt, soil, and bedrock (Figures 25 to 27). The <br />July 1963 aerial photos showed evidence of old landslide, and (hick dcpo>us of cullusium <br />below the outcrops of bedrock. <br />• The landslides occurr~ after construction of Highway 133 on the south side ul-the North <br />l=urk of the Gunnison River during the early 1980x. Most of the landslides occurred during <br />periods ut'precipitatiun in the mid 1980s to mid 1990x. <br />• The old landslides and colluvium was subjected ro a combination of sliding, slumping, and <br />flowing as the support in their lower parts w:u removed while making the road cut. <br />.~.:f <br />~ S 0,,• !( <br />, <br />- . 'V..-~y` ~ <br />~'l <br />i ~ ` , <br />• <br />rte. - _.~" s~.~, f a` <br />-~ " ~„~'. <br />Figure 25. Southwestward view of a slumped area located at Ote head scarp of a landslide located a few <br />hundred feet upslope from State Highway 133. The scarp area is located about 1.700 feet north of the <br />north etlge of un-mined longwall panel 18, and about 600 teal north of the northern, un-named panel <br />extension off lortgwall panel 18. <br />831-032.640 Wright Walar Englneons, Inc. Pago 42 <br />Septemtwr 2004 <br />