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Memo to Tom Schreiner 2 September 23, 2005 <br />Blasting Plan Review File No. M-2004-067 <br />3. Hole depth to burden ratio shall always be greater than 1.5. DMG notes that the blast patterns shown in <br />figure 2 of the Applicant's "Response to 2"d Adequacy Review" dated August 19, 2005 are in compliance <br />with this criterion. <br />References for Establishment of Blasting_BMPs: <br />Dick, Richard A., Fletcher, Larry R., D'Andrea, Dennis V., 1983, "Explosives and Blasting Procedures <br />Manual," United States Department of the Interior, Bureau of Mines Information Circular IC-8925. <br />Rosenthal, Michael F., and Morlock, Gregory L., March 1987, "Blasting Guidance Manual," United States <br />Department of the Interior, Office of Surface Mining Reclamation and Enforcement. <br />enclosure(s) <br />cc: Alex Schatz, Banks and Gesso (via fax, w/enclosures) <br />Bruce Humphries, DMG (via email, w/o enclosures) <br />Carl Mount, DMG (via email, w/o enclosures) <br />Harry Posey, DMG (via email, w/o enclosures) <br />c:\Docunrents and Settings\ACSU1y Documen[sVvf MRR blasting plan review of 3r° adequacy response.doc <br />