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Memo to Tom Schreiner 11 February 21, 2006 <br />Bulkhead Cost Estimate Permit No. M-1983-141 <br />temperature shrinkage rebaz at both ends of the bulkhead is #6 bars on 12 inch centers, both ways <br />stainless steel bypass and monitoring piping is necessary <br />Concrete will use maximum'/a inch aggregate, Type V cement, 16 percent fly ash, pozzolan, <br />water/cement ratio of 0.45 by weight, and will be over sanded to enhance pumpability <br />Bulkhead Construction Cost Estimate <br />DMG has estimated the cost to install the two proposed bulkheads, and to backfill the adit outby the <br />secondary bulkhead with impervious fill, at $328,161.00. This estimated cost includes all indirect costs and <br />the five percent administration cost required by statute. The estimated costs are detailed in the worksheets <br />enclosed with this memo. The estimate uses adjusted unit costs incurred during the construction of the <br />Terry Tunnel bulkhead in the Sunnyside Mine during the mid-1990s. A copy of the detailed Terry Tunnel <br />bulkhead costs is also enclosed with this memo. <br />Verification of Bulkhead Effectiveness <br />For water impounding bulkheads in underground mines to be effective, there must be no direct <br />hydrogeologic connection between the impounded mine pool and surface water bodies. Ground water <br />tracers are a means to determine if such connections aze present. Initially, DMG will require that the <br />Applicant provide a plan to trace the current, existing pool of water in the Cash Mine. It is imperative to <br />inoculate the mine pool with tracer before spring 2006 storm season and snowmelt, if mining is to occur in <br />2006, in order to investigate intermittent drainage in the vicinity for presence of the tracer. The Applicant <br />must provide a tracer study plan for DMG review and approval no later March 15, 2006 in order to <br />commence the investigation no later than Apri13, 2006. Additional tracer investigations will be required <br />during the life of mine, particularly prior to installation of adit bulkhead seals at the end of operations; these <br />future tracer investigations will be the subject of a forthcoming memorandum. <br />Bibliography <br />FORTHCOMING <br />enclosure(s) <br />cc: Matt Collins, Mount Royale Ventures (via regular mail and facsimile transmission, w/enclosures) <br />Mazk Steen, (via regular mail and facsimile transmission, both c% Mt. Royale, w/enclosures) <br />Carl Mount, DMG (via email, w/o enclosures) <br />Harry Posey, DMG (via email, w/o enclosures) <br />Bruce Humphries, DMG (via email, w/o enclosures) <br />c:\Documents and Se[tingsWCSVNy Documents\Cash mine bulkhead cost es[imate.doc <br />