Laserfiche WebLink
2006 Subsidence and Geologic Field Observations <br />Box Canyon. West Flatiron, Apache Rocks, and South of Div+de Mining Areas <br />2.4 Gravity-Induced Cracks <br />Gravity-induced crocks hove been ahsened un steep ridges. near clitt's, and in landslides within <br />the lius (':uryun. 1Vest Flatinnt.:~paehc Rucks. and South of Divide mining areas (Figure ~). <br />1'hr cracks look like >ubsidcncc cracks in appearance but arc titund in areas wh~me nu mining h:u <br />occurced. The cxtcusice crock un u narrow ridge on the northern part of W'rst Flatiron tas much <br />as ~.> inches wide and I~(t leer lung un :\ugust 2%. _'lttl_'), i a good csample of a tTacity- <br />induced crack (L)unrud ?I103). It naa case to determine that this u:ts nut amining-related crack <br />because no mining had nccurced in the area. l~hc passibility ul erat tly-induced cracking ut the <br />rugged country shove planned mining activttie> at the 1Vest Flk \lutc is a good reason to pcrtimn <br />bascluw studies of the area prior to mining so that these tuutures can be documented. <br />~ -~ -*; <br />'~ X~ '' ~ - <br />~ ~ r _ 4' <br />~ c t ~ <br />~ti + ~ ~ . <br />i ~ ++~~ " _.V.s" i~ `, ~ ice-,. ~, t.. <br />,~1~ p ~4S ~ ~ S <br />y w a <br />t ... ~~V <br />~, pr V _ <br />i + <br />I Igure 4. (irat ny-uxluced Icminn crack< located above un-tninrd cv;d ut the upper. <br />ntacstvc :andsuatc ~~f 6te (thin Crock tt1enthrr ol'the !vlcsmrrde furnnuunt. (lu~~kmc <br />uunhtecstj t~nnt. hate opcnal up n G!ol .!r sn dur to gncuWiunal stresses under little ttr <br />Ifo lalerdl lUllil101111. <br />631A32.750 Wright Water Engineers. Inc. Page 7 <br />Docemtwr2006 <br />