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Fall 2007 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />• <br /> <br />• <br />~~ <br />,~ ~ . <br />_ ` ~ <br />• '! ~~~ <br />~~ <br />{ i <br />~~ <br />.~~~ <br />.,~ <br />~~ .t, <br />Figure 11. En echelon crack number 4 zone, located about <br />20 feet east of crack number 3 zone, is as much as 6 inches <br />wide and about 150 feet long. This crack is likely one of the <br />cracks observed during the spring 2007 field visit. <br />5) Irrcgtrlur, hranc•lrittg crack locatccl S to ?(I f~~ct cast of cn cchclort crack tttr»thcr 4 _ortc <br />(t•i~=tu•c~.~~ 1? a»cl 13). This crack i~ ahc~ut 150 feet long, as much ~i~ I? inches wide, and <br />trends northward and northeastward from the drill road to the eastern cliff-edge (Fi~urc <br />13 ). This crack ma_y be an en echelon extension of crack number 4 zone. <br />831-032.780 Wright Water Engineers, Inc. Page 24 <br />November 2007 <br />