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III III III III IIII IIFb 999 STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Depart menl of Natural Resources 131 J Sherman SL, Ranm 215 Denver, Colorado H0203 Phone: 0031 tlh6 3557 FAX. 1JOJ) H32-H 105 DATE: TO: FROM: RE: August 31, 1995 Christine Johnston Jim Pendleton Blue Slope I~~ DEPARTMENT OF NATURAL RESOURCES Roy Ramer r `~ Governor I lames S. Lnchhead ~ ' EMPCOIrve DIrKlO! _~ ~' ~ 1 Michael U. Long ~ ~ Division Diieclor Technical Rev. 11 Stab~il~t~ Monitoring Cessation (Permit #C-81-047) I reviewed the technical revision application referenced above submitted on behalf of the Blue Ribbon mine by James Stover, P.E., consultant to the operator. As a portion of this technical revision Mr. Stover requests approval to cease periodic monitoring of the slope stability monuments installed on the Blue Ribbon reclaimed mine portal bench. As supporting rationale for his request, Mr. Stover observes that the slope stability monuments have not been effected by the past three episodes of instability evidenced at the bench. It is true that the monuments have not been effected by these three surficial slides. Each landslide was a relatively small failure which effected on a middle portion of the facial slope of the bench. These slides were also limited to relatively shallow failures of the topsoil and shallow waste comprising the bench. The slope stability monuments, however, served to document that the overall structure of the mine bench has remained stable. Under Mr. Stover's proposal they will be retained and can again serve that purpose in the future, if necessary. I recommend your approval of the request for cessation of slope stability monitoring of the Blue Ribbon portal bench monuments, with the condition that they are retained for future resurvey, if necessary. cc: Dave Berry Doc: M:\MIN\JAP\BLUESTAB.MON JP/JP