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DNR <br />June 19, 2020 <br />COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />Mr. Tony Tennyson <br />Elk Ridge Mining and Reclamation, LLC <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />Re: New Horizon Mine C1981-008, TR99 <br />Preliminary Adequacy Review <br />Dear Mr. Tennyson: <br />The Division has reviewed ERMR's submittal of Technical Revision No. 99 (TR99) for the New <br />Horizon Mine. <br />Table of Contents <br />1. Page 1 in the Table of Contents (TOC), the current version has "i" not "1" in the footer. Pagination <br />should remain consistent to minimize confusion. <br />2. Page 2 in the TOC, the current version has "ii" not "2" in the footer. Also, several tables, <br />attachments, and maps are deleted from the TOC, however this is not reflected in the pages in the <br />text. Please assure that the revised table of contents are also in agreement with previous revisions. <br />For example; TR98 proposed to approve Table 2.05.3(3)-1 remunerated to page 10. <br />Text of Section 2.05.3(3) <br />3. TR99 Section 2.05.3(3) page 9 (March 2020) should be renumbered "Section 2.05.3(3) page 3" to fit <br />in to the revisions approved with TR98 (AP 6/4/2020) <br />Deleted Attachments <br />4. Please explain why this revision proposes deletion of Attachments 2.05.3(3)-6 and 2.05.3(3)-21.? <br />Should some of these attachments remain? For example, the safety calculations by Lambert <br />Geotechnical engineers are not duplicated in Attachment 2.05.3(3)-32 and appear to be relevant to the <br />pond specifications. <br />Attachment 2.05.3(3)-32 <br />5. Please explain why Tri-State decided to no longer reference Table 2.05.3(3)-1 A (SCS Curve <br />Numbers) on page 1 of the attachment, but instead references historical curve numbers in another <br />table. <br />6. Please provide an explanation the large change in flow out of Structure #2, from 0.00 acre feet to 8.18 <br />.OF 'Co <br />y ' <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us I <br />Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director *�* <br />