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D-24 <br /> If so, CSC will later determine if the incremental life-of-mine contribution from the area's resource <br /> base is sufficient to justify mining,in which case annual mine blocks will be identified and an optimal <br /> mine progression determined. In spite of the current level of uncertainty, CSC has incorporated the <br /> area into the overall Permit Area,secured all necessary"structure agreements",and made all necessary <br /> "notifications", such that incorporation of the area/tonnage (into the life-of-mine plan) can be <br /> accommodated via a future Technical Revision to the permit. <br /> (2) Ennis Draw"Temporary Mining Deferral Zone" <br /> The Ennis Draw"Temporary Mining Deferral Area" is classified as such due to a lack of exploration <br /> data to support meaningful analysis of the resource base; and,due to internal(CSC)concems about its <br /> general mineability, given that it incorporates delineated (but non jurisdictional) wetland features <br /> (indicative that physical mining constraints may be a concern). Accordingly,CSC has completed mine <br /> planning efforts to date such that no mining has been proposed within a defined 600-ft. wide north to <br /> south corridor centered on the map-depicted alignment of the intermittent drainage (and surface water <br /> features) as shown on USGS topographic mapping and subsequent field confirmation of same (refer <br /> also to Exhibit D-1: Mine Plan). <br /> Given the corridor's"non jurisdictional"status(as conferred by USACE),CSC notes that there are no <br /> specific regulatory limitations or constraints that would prohibit partial or full mining of the corridor. <br /> Nevertheless, additional data is required to determine the efficacy of doing so. The forthcoming <br /> incremental data will be largely obtained through additional resource definition (exploration) and <br /> targeted hydrogeologic investigation(to define localized groundwater conditions),both of which will <br /> contribute to the decision-making process relative to the efficacy(and economic viability)of the Zone's <br /> mineability,either partially or in its entirety. <br /> If determined mineable(in part or entirety)by CSC,it is estimated that the gross resource base residing <br /> within the corridor (in its entirety) may exceed 20 million tons of mineable material, potentially <br /> representative of an incremental two (2) to four (4) years increase to the overall life-of-mine. As <br /> evidenced by the planned mine progression described above for Years 1 through 5, CSC has <br /> purposefully developed the overall mine plan in a manner that defers all mining within the Ennis Draw <br /> corridor until(at its earliest)the latter portion of Year 4. It is anticipated that this deferral will allow <br /> Keenesburg No. 2 Mine_112 Reclamation Operation—November 22, 2019 <br />