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Gold King Mines Corporation <br />P.O. Box 299 <br />Silverton, Colorado 81433 <br />Telephone (970)387-5813 Fax (970)387-5760 <br />~~ <br />oF~,~' ]~'~~® <br />~P <br />'a <br />~s~ <br />November 17, 2003 <br />Mr. Wallace Erickson, Reclamation Specialist <br />Department of Natural Resources <br />Division of Minerals and Geology <br />Durango Field Office <br />701 Camino Del Rio, Room 125 <br />Durango, CO 81301 <br />RE: Koehler Tunnel Bulkhead <br />Construction Certification Report <br />Dear Mr. Erickson: <br />Ate, <br />?~'~' .;. <br />~' x4d9 <br />pry ale ~~de~ ~'~"°'"'~~~~%~~~~,~ ., <br />$~ntiystc~e Nt~ne ~~ <br />M -1977- 378 '' ygCVS~f S! <br />~' nsenfi ~ecre~ <br />This letter report is to provide certification that construction of the Koehler Tunnel <br />bulkhead meets or exceeds design criteria. Submittal of a construction certification <br />report was committed to by Gold King in their contract for construction of the bulkhead <br />with Sunnyside Gold Corporation. <br />Pre-pour inspections were conducted by DMG and the design engineer, John F. Abel, Jr. <br />P.E. on September 5, 2003 (letter report attached). No deficiencies were found in either <br />pre-pour inspection. <br />Bulkhead location <br />The approximate center of the bulkhead, approximately six feet above the sill, on the air- <br />side face (side towards surface) of the bulkhead is located at station 3+02 measured from <br />the rock face at the portal at an approximate elevation of 11,200 feet. Samples of rock <br />from both ribs and the back were taken and sent to testing laboratories to verify adequate <br />rock strength for the bulkhead location. Cores were taken from the three samples tested <br />to failure. The test results are attached and considered satisfactory. One core exhibited a <br />low value failure. This failure was due to a combined shear/fracture failure and does not <br />represent the strength of the rock in place. <br />The construction stages for certification are listed below. <br />