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M I N R E C, I N C. <br />743 HORIZON O0UR1', SUITS 205 <br />G7tAAID JUNCTION, CO 81506 <br />TSLSPHONS (303) 245-4101 <br />BLUE RIBBON MINE <br />iii iiiiiiiuiiiiiii <br />sss a <br />~aAR 21 X390 <br />~AIIVEU tr...,. <br />ti~G 7AT~ . <br />March 19, 1990 <br />Matthew S. Hayes <br />Mined Land Reclamation Division <br />215 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203-2273 <br />Re: Quarterly Bench Stability Monitoring; <br />Permit No. C-81-047 <br />I J <br />Dear Mr. Hayes: _ - _-__ ~`" %~ 1 <br />The first quarter 1990 bench stability survey was performed March <br />18, 1990. Vertical angles were measured with a 20 second <br />theodolite and elevations were calculated using predetermined <br />horizontal distances. A summary of this survey, the last two <br />surveys and the 11-20-85 base line survey is as follows: <br /> 11-20-85 09-27-89 12-11-89 03-18-90 <br />S-1 6400.90 6400.68 6400.63 6400.63 <br />S-2 6396.06 6395.91 6395.87 6395.87 <br />S-3 6385.77 6385.58 6385.55 6385.55 <br />S-5 6479.92 6479.56 6479.53 6479.52 <br />S-6 6480.51 6479.85 6479.85 6479.83 <br />S-7 6479.31 6479.04 6479.02 6479.00 <br />S-8 6479.92 6479.55 6479.49 6479.51 <br />Let me know if there are any questions concerning this data. <br />Sincerely, <br />sU~~`~ <br />Jim Stover, P.E. <br />Chief Engineer <br />MH031990 <br />