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M I N R E C I N C. <br />743 HORIZON COU17T, SUITE 205 <br />C~L4ND JUNCTION, Ca 81506 <br />TELEPHONE (303) 245-4101 <br />BLUB RIBBON MINE <br />iii iiiiiiiiniii iii <br />~!CV 21 IS°0 <br />^CI2 - <br />November 17, 1990 <br />S. J. McCannon <br />Mined Land Reclamation Division <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />- -- - - -Re: Quarterly Bendh-Stability Monitoring; -- ---- - <br />Permit No. C-81-047 <br />Dear Ms. McCannon: <br />The forth quarter 1990 bench stability survey was performed <br />November 16, 1990. Vertical angles were measured with a 20 <br />second theodolite and elevations were calculated using predeter- <br />mined horizontal distances. A summary of this survey, the last <br />two surveys and the 11-20-85 base line survey is as follows: <br /> 11-20-85 06-15-90 09-14-90 11-16-90 <br />S-1 6400.90 6400.65 6400.65 6400.62 <br />S-2 6396.06 6395.89 6395.90 6395.87 <br />S-3 6385.77 6385.57 6385.57 6385.55 <br />S-5 6479.92 6479.54 6479.57 6479.53 <br />S-6 6480.51 6479.86 6479.89 6479.85 <br />S-7 6479.31 6479.02 6479.04 6479.04 <br />S-8 6479.92 6479.53 6479.54 6479.53 <br />Let me know if there are any questions concerning this data. <br />Sincerely, <br />Jim Stover, P.E. <br />Chief Engineer <br />SM111790 <br />