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D-6 <br /> (may be marked "CONFIDENTIAL" pursuant to Paragraph 1.3(3); and, (ii) nature of the <br /> stratum immediately beneath the material to be mined in sedimentary deposits; <br /> Due to the nature of the deposit, no "overburden" (in the traditional usage of that term) has been <br /> identified as being present;therefore,no"overburden"is anticipated to be encountered or removed. <br /> A nominal 12-inch thick surficial"growth medium"horizon has been confirmed as being consistently <br /> present throughout the mineable zones identified to date within the Permit Area. The growth medium <br /> (topmost 12-inch horizon)will be pre-stripped in advance of mining,and initially stockpiled(through <br /> Year 5)for utilization in final site reclamation activities; or,under steady-state operational conditions, <br /> minor volumes will be intermittently utilized toward feature-specific"advance"reclamation(in order <br /> to minimize outstanding reclamation obligations at the end of life-of-mine). <br /> The immediately underlying sand zone is considered mineable material, or run-of-mine (ROM) <br /> material, suitable for processing; and, as such, it will be excavated and delivered directly to the ROM <br /> stockpile for subsequent processing. Actual mining depth will be largely dependent on sand presence <br /> and quality characteristics. <br /> Exploratory drilling completed to date indicates that the target sand horizon,while variable in thickness, <br /> can extend to a depth of as much as 40 f3.below existing ground surface. It is CSC's intent to mine a <br /> depth horizon sufficient to ensure that the Keenesburg No. 2 Mine's economic objectives are attained, <br /> which are, in turn, anticipated to be largely dependent on physical mining constraints (sand zone <br /> thickness)as well as projected mineral processing recovery factors. <br /> Based on available data, anticipated pit-floor conditions can be described as a silty sand, silt, and <br /> mudstone matrix, thereafter grading (at depth) into shale. The immediate pit floor sub-horizon <br /> (comprised of sand,silty sand,and/or silt)will accommodate rapid and high infiltration rates within the <br /> mined out pit depression both during,and subsequent to,the operational life-of-mine. <br /> The material to be mined is classified as an eaolian(dune)sand deposit of varying depth and character. <br /> Thus, CSC anticipates that mining depth will vary with the localized presence (thickness) and sand <br /> quality characteristics (silt content) and projected process recovery factors. Thus, operational <br /> objectives may result in certain depth profiles within localized areas not being mined to full extent. <br /> Keenesburg No. 2 Mine_112 Reclamation Operation—November 22, 2019 <br />