Laserfiche WebLink
R 21NCORPORATED GEORGE M.L. ROBINSON,P.G. <br />ENVIRONMENTAL AND ENGINEERING SERVICES <br />STRATEGICALLY POSITIONED TEC ki R?>3 1. ERICH RALIBER.P.E. <br />6::.. ii??ii 99 44?? <br />APP 25 2011 <br />Divf?ivn of acclamation <br />Mr. Wallace Erickson Resources Wing and S&P-by ? <br />Department of Natural 401? r <br />Division of Reclamation Mining and Safety Diourdngo 10?? <br />1313 Sherman Street, Suite 215 4Z7 f) ? d? pa Ce <br />Denver, Colorado 80203 <br />afety on <br />Re: Response to CN-01 Preliminary Adequacy Issues for a 112d-1 Application, CN-01, <br />Wildcat Mining Corporation, May Day Idaho Mine Complex, File No. M-1981-185. <br />Geotechnical Response <br />La Plata County, Colorado <br />Dear Mr. Erickson, <br />The following responds to geotechnical comments related to Wildcat Mining Corporation-May <br />Day Idaho Mine Complex. <br />(1) On a site-specific basis, an Applicant shall be required to provide a geotechnical evaluation <br />of all geologic hazards that have the potential to affect any proposed impoundment, slope <br />embankment, highwall or waste pile within the affected area. The applicant may also be required <br />to provide a geotechnical evaluation of all geologic hazards, within or in the vicinity of the <br />affected lands that may be de-stabilized or exacerbated by mining or reclamation activities. <br />Response: <br />Geotechnical laboratory and stability analyses have been conducted by <br />• Sukura Engineering (Farmington, New Mexico) -Mr. Paul Martin, Colorado Registered <br />Professional Engineer # 27207 (Access road, bridge upgrade (25 tons), May Day steel set <br />portal stability analyses) <br />• R Squared, Inc. (Denver, Colorado)-Mr. John Erich Rauber, Colorado Registered <br />Professional Engineer #26647 (Access road, May Day portal collapse, augmentation <br />pond and portal bench outslope geotechnical analyses) <br />• William C. Birza, P.E. Colorado Registered Professional Engineer, 19902 (Original <br />Bridge Calculations-15 tons) <br />• Terracon, Inc. Farmington, New Mexico (Laboratory Services) <br />Geotechnical hazards evaluated include the following: <br />• May Day No. 1 Portal Collapse and head scarp (Denver, Colorado)-Mr. John Erich <br />Rauber, Colorado Registered Professional Engineer #26647) <br />• May Day No. 1 portal steel set stability <br />• New Access Road-road stability including cut slope (Denver, Colorado)-Mr. John <br />Erich Rauber, Colorado Registered Professional Engineer #26647) <br />May Day Idaho Mine Complex 112(d) Permit Application <br />Revised: April 14, 2011 <br />"Strategically Positioned - Technically Prepared" <br />5555 DTC Parkway Suite A-4000, Greenwood Village, Colorado 80111 <br />Phone: (303)832-7664 1 Fax: (303)832-7469