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Mc Stone Reappn~e ~3' <br />from all outward appearances the sedimentary Dakota Sandstone depositional bed to be mined is a <br />monolithic, highly indurated unit without apparent significant bedding or fracture structures 1'he stable <br />naturally occurring exposed steep canyon wally of Plateau Creek gorge arc the primary evidence of such As <br />extraction progresses from the Pre-Ouam• u> deeper within the sandstone bed any conflict with this <br />evaluation can be readily detected, and the plan fix final finished highwall slopes at the extraction boundaries <br />can be accordingly altered to assure a stable situation <br />To that end we propose conditional approval of the application-proposed near-vertical benched one-quarter <br />vertical to one horizontal 1'/+: I) headwall slopes, dependent upon a stntctural eraluauon m be completed and <br />reported to Division by the applicant/operator prior to the final extraction perimeter explosive shots In this <br />way we can be assured of the absence of a heretofore undetected troublesome bedding or fracture plane that <br />would contribute to an unstable highwall And il' such anomalies are detected, the plan for highwalls to <br />remain shall he appropriateh modified <br />:ldeguacv Item tt41 <br />1. MG has completed a prtllminary reclamation cost estimation totaling 516,193. The <br />reclamation cost estimation is based upon the proposed reclamation plan and several <br />assumptions. One o/the assumptions !s that the highwall would be scaled for loose rock (task <br />2). The enclosed reclamation cost estimation is preliminary and may be revised after OMG <br />receives response to the adequacy issues raised in this letter. <br />\1cStnnc ('umment n.y <br />Division calculations fix the initial Tnune•rul wurrrnrtt~ value arc acceptable to the applicant, with the <br />followinu clantications. <br />Task tit Weight scales are not intended to be used at the site, and are not dc~signatcd in the dining or <br />Reclamation Plans No other semi-permanent structures arc intended to he constnrcted either .All <br />processing egwpntent is portable and shall he located at the site only seasonally before mobilizing it <br />fix mam• other operation applications <br />We therefore consider Task h I to be un-necessary in the cost calculation lix financial warranty <br />~s.• <br />As verbally discussed with you earlier we wish to clarify that labeled "Prrnri- 13nunduriec" in the three Plan <br />\1ap exhibits arc considered to be the "Affected Land" areas, as defined by Ilule• l.l/:~l labeled <br />"1•:xrutr~ncrrr limits' are intended to only reflect approximate cxtraaion and operations arw boundaries <br />Peripheral disturbance between those two designations may occur tiara time to time <br />You have been provided with copies of the US Army Corps of Engineers correspondence regarding <br />compliance with Corps 401 n 404 perntit requirements. It has been established that compliance therewith is <br />not an issue at the prolx~sed site <br />The applicant has requested that we modify the address of record to assure that all correspondence is <br />invariably directed to the Corporate Secretan I have therefore corrected and attached the tidy page and <br />Pu,;•.~ ? ~~f the aplrlication fomt to reflect the otlicial mailing address of <br />life tirrt~t: Accttt•:cnrt:~ I.L(' <br />1'.(1. Box SR3 <br />(~ortez, CO 81321-0483 <br />