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III IIIIIIIIIIIII III 999 ~ STATE OF DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman Sl, Room 215 Dem•er. Colorado 80203 Phone: 1303) 866-3567 FA\:(303)832-8106 RECEIVE[' 'JUN 18 1999 June 15, 1999 Division of Minerab 8 Geoloy~ Rex Loesby Sierm Minerals Corp. 6164 S. Newport St. -Ste. 2000 Englewood CO 80l 11 COLORADO Gilt; s f ~. pV~CIC ~ ~FF~CE F/~E. ~ ~~LE C p pY S~]-E:-- -vs`8 /~ r `N' Re: Yule Quarry, File M-99-0~8, New 110 Permit Application, Preliminary Adequacy Review. Dear Mr. Loesby, D~SS MINERALS GEOLOGY• RECLAMATION MINING•SAFETY ~ Bil l Owens Cavemor Greg E. Walther Eaeculive DrtellOf Michael 8. Long Division Director I have finished my technical adequacy review of the above named application. Overall I was impressed with the quality and degree of detail of the exhibits. [ have a few questions, however, which must be answered to satisfy the requirements of the Rules. Please do not let the length of this letter overwhelm you; these items are fairly minor, and I have tried to be thorough in identifying all needed items. I have listed my questions below in the order of the exhibit to which they pertain. Exhibit AExhibit A Leal DescriptionDescription The metes and bounds description of the proposed permit boundary appears to be complete, if a small clarification can be made in the text. On line 14 of the "Affected Area Description" text, there is a sentence beginning with `"Thence generally north and slightly west...." I interpret that sentence to describe the next nine short sides of the perimeter polygon, ending back at the point of beginning. If that interpretation is not correct, which may mean some text is missing, please clarify. If it is correct, the description may remain as it .vas originally provided, since the rest of the boundary description matches the Exhibit E maps. Exhibit B -Site Description The description is complete, and [his is only a comment, partly based on observations made during the pre- operation inspection. The unaffected area at the south end, which may become a new waste rock dump, probably contains a significant amount of topsoil and organic matter. Please be aware of the potential reclamation cost savings if these soils can be salvaged prior to placement of waste rock in that area, and properly protected during mining. Likewise, there will potentially be a need for suitable handling and/or disposal of the timber to be cleared from some of that south end and any expansion on the eastern edge. I will corrunent further about these items below. Exhibit [Exhibit C Minin~Plan The extension of the waste rock areas was stated to be in an easterly and northerly direction. 1 do not believe that there is room to expand to the north (vve want to avoid another violation for offsite damage!). Was the stated direction of extension intended to be to the south? Please clarify. Please provide more description of the methods of stabilizing the toe of the existing waste pile. Will the structura stabilization work be onsite or offsite, and what will be its dimensions? Also, regarding ho+v stability of the slope will be maintained during mining, please describe the waste rock placement method (such as, placed from the toe vs pushed from above, placed in lifts or benches, etc.).