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Access Portal Collapse Repair and Equipment and Stope Rock Removal Work Plan <br />March 2, 2012 <br />llay NO. 1 <br />oved <br />to recover <br />The collapsed material near the top of the respective prt�P be om ortal. stof the estimated e300 <br />buried crushers and a mucker while stabilizing the Access <br />cubic yards of material can be removed frothe anual bon he t removed at an be <br />excavator and a small front end loader, or using storage until Phase 2 when the <br />hauled to the May Day No. 2 bench (Figure 3) fowall. Ttemphe <br />s ored materia] will be surrounded <br />material will be used for stabilization of the high andro riate <br />devices such as silt fe Straw materials will be certified straw bales or straw <br />with erosion control weed free- Crushers <br />stabilized with straw mulch and tack' fier. be conducted at <br />will be removed from the collapsed mill area. No an then ill build n ork he Mill <br />and removal of the <br />in <br />Portal other than removing the debris and soil withthem g <br />crushers and mucker. <br />Accessible trees, roots and loose vegetation in the collapsed material, and any generated <br />r, etc.), will be removed and disposed in an approved off <br />construction -related debris (wood, page ) <br />site landfill. Wildcat will also scale rock, debris and vegetation from the highwal1. <br />ll <br />When the Access Portal has been cleared, a Colorado registered <br />ons including but not limited to <br />geotechnical and rock mechanics portal repair rand shotcrete stabilization coupled with steel set <br />head scarp clearance, buttressing, rock bolting, <br />portal installation and stabilization of the Access Portal. Any impaired steel sets will be removed <br />and stored in the Idaho warehouse. A steel protective d or shields will be specified an <br />fabricated for the steel sets to provide protection oforker <br />s. <br />Interim portal rock stabilization methods will be installed as necessary to provide stability of the <br />P observations, these methods will include <br />of 3 to rock mass for safe access. Based upon preliminary 6 feet as necessary to stabilize the rock. <br />installation of split -set rock bolts on spacing <br />Galvanized steel straps may extend across rock joints between the rock bolts as necessary. <br />Chain-link or 4x4 wire mesh may be placed over rock surfaces, fazoIlo ed by ton Figure 4. inches <br />of shotcrete. Conceptual sections of adit stabilization measpresented le of what the design <br />Structural support systems are being designed by an engineer, but an exam - <br />ma be is as follows: assuming a 10 -feet wide span and using a structural steel with a yield <br />Y a W4xl3 beam could support a uniform loaf 1 <br />of <br />strength of 36,000 pounds per square inch (psi), <br />8 600 pounds. If the spacing on the steel sets is 4 feet, and the assumed density of overlying <br />is 140 pounds per cubic foot (pcf), <br />this would provide support for up to 15 feet of cover over the <br />alit. Final specifications for the steel sets will b p onencount ring t upon sound rock <br />k coverfield . A <br />encountered, and the height of fill over the adit prior <br />locking steel gate will be placed at the portal opening to control access to the adit. <br />performed as necessary to access the stope area, including <br />Rehabilitation of the adit will be pe les of material <br />mucking and rock stabilization measures.Wlwill F phase scan of the stope and portions of <br />located at the stope area and conduct geotechnical <br />EnviroGroup Limited <br />DEN 97,749,0130 2-29-12 <br />