2016-06-29_REVISION - M1981185 (3)

Home Browse Search

Wildcat Mining Corporation May Day and Idaho Mine and Mill Application 112(d) Permit – Technical Revision No. 1 May Day and Idaho Mine M-1981-185 Revised June 30th, 2016 5 The data were used to; • Develop a headwall and portal mitigation stabilization strategy; • Define rock anchor installation oversight activities and to address potential instability concerns; • Evaluated completed rock anchor installation tensional test; • Perform a slope and headwall stability analysis; • Check backfilled construction materials to meet design specifications; and • Observe the placement of fill material; 4) Site construction Summary The following assessment activities were completed: • Geological and geotechnical site reconnaissance by Gonzales March 31, 2011, R Squared, Inc. March, 2012 and Trautner Geotech, LLC; • Bench Geotechnical Investigation –(Attachment4); • Portal Designed; • Removal of collapse material from the access and mill portals; (Bench stability report prepared by R Squared, Inc. was previously submitted) Portal initial work plan was submitted on March 2 [EnviroGroup-Access Portal Collapse Repair and Equipment and Stope Rock Removal Plan], Adequacy Review, March 8, 2012 and approved by CDRMS on March 12th, 2012 ; • Removal of buried equipment and collapsed debris from the access and mill portals; [Collapsed debris (photos 1 and 2) was stock piled adjacent to May 2 2016 portal];Used shotcrete (reinforcing medium), split set bolts to secure 4X4 welded wire fabric (See Photo); • Geotechnical studies to specify split set spacing pattern; (See photo); Portal stabilization (Attachment 5-Franklin (February 22, 2012). Trautner observed steel set construction/installation Attachment 6; • Removal and placement of damaged steel set(s) and protective canopy inside the access portal; [Buried equipment was removed by Wildcat Mining Corporation and the access portal was designed ( Figure 2) and replaced by Melcher Brothers]; Adit Stabilization – Melcher Brothers-Observed adit repair and assessed highwall stability features to verify construction was in accordance with the construction drawings and specifications. (See Figure 1-As-built Topographic Map); • Site grading and gravity wall construction (under Trautner Geot supervision); • Installed steel sets (Attachment 7); • Installed bench and upper terrace stormwater control Best Management Practices; • Installed headwall and bench stability survey monuments; (Mountain Man,2016);