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STATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY <br /> Department of Natural Resources oF,C <br /> 1313 Sherman St.,Room 215 <br /> Denver,CO 80203 <br /> « r <br /> Phone:(303)866-3567 1876• <br /> FAX:(303)832-8106 <br /> Roy Romer <br /> Governor <br /> Michael B.Long <br /> January 24, 1994 Division Director <br /> Mr. Larry Perino <br /> Sunnyside Gold Corporation <br /> P.O. Box 177 <br /> Silverton, CO 81433 <br /> Re: F-L Brenneman Secondary Bulkhead - Wall Irregularity, Sunnyside <br /> Mine, File No. M-77-378 <br /> Dear Mr. Perino: <br /> Based on the information submitted in your letter dated January 21, <br /> 1994, and on observations made by Jim Dillie and Tom Gillis during a <br /> site inspection on January 20, 1994, the Division accepts that the <br /> design assumption for wall irregularity is valid for the above <br /> referenced bulkhead. <br /> It can be seen from the information in your submittal that it is <br /> difficult to quantify the degree of wall irregularity without an <br /> extremely detailed survey of the bulkhead location. However, the <br /> Division believes that the x-sections, long sections and plan sections <br /> are useful to confirm wall irregularity. Your assumption that any <br /> intrusion into the overlain x-section exists over the distance between <br /> sections detracts from the conservatism of your analysis, however, the <br /> analysis submitted is adequate to demonstrate that the intact rock <br /> perimeter area irregularity is greater than 10 percent. Similar <br /> measurements and analysis, along with qualitative observations, will be <br /> acceptable for the remaining bulkhead locations. <br /> If you have any questions, please contact me. <br /> Sincerely, <br /> Allen C. orenson <br /> Reclamation Specialist <br /> C: \WP51\SUNNY <br />