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:~ <br />Richare D. Lamm <br />Garrmor <br /> <br />DEPARTMENT OF NATURAL RESOURCES <br />Dana H. Gelcnas. Erecutira Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTO N, Director <br />September 16, 1985 Northr»t Ra~oure~ Atw <br />Build~r.g 41, D~nv~r Fed. Gn6~r <br />P.O. Eclt 25047 <br />Mr. Mark Steen Demar, CC1 80225-0047 <br />Gold Hill Mining Company <br />P.O. Box 1523 <br />Longmont, Colorado 80501 <br />Re: CASH MINE Amendment, Permit No. M-83-141 <br />Dear Mr.~Steen: <br />During the week of September 1-7, 1985, the Division inspected the Climax and <br />Henderson Mines operated by Climax Molybdenum Company, a division of Amax. <br />These inspections have caused the Division to re-evaluate your proposed <br />reclamation plan and have raised the following concerns. <br />Besides the above, we have done some internal discussions related to the <br />proposed storage of water in underground workings. This discussion has raised <br />a number of concerns as addressed below. <br />Please respond to the following no later than September 23, 1985. <br />Tailings Reclamation <br />1. The research plats and reclamation that has been accomplished to date at <br />the Henderson Mine reveals that reclamation of tailings that have been limed "ii, <br />is nearly impossible and do not meet the mandate of the law pertaining to <br />revegetation. This is true no matter what the depth of soil placed over the <br />limed tailings. The only way to properly reclaim tailings is to place a rack <br />capillary barrier between the tailings and the *_opsoil medium. This rock <br />barrier inh'bits the upwarG migration of contaminants from the tailings thus <br />preserving the topsoil medium. Therefore, it is necessary to change your <br />proposed reclamation plan by installing a minimum two foot rock capillary <br />barrier between the tailings and the topsoil medium. Please discuss in detail <br />where this material will be obtain:d, how it will be placed over the tailings, <br />depth of topsail, etc. <br />2. hill the tailings pond area be lined with a commercially available liner <br />(eg.: PVC or Hypalon)? If not, will the tailings be compacted to 10~ to <br />inhibit or reduce infiltration? If not, how will the area be protected from <br />movement of water into and through the tailings pile? <br />3. Mill any monitoring wells be located dawngradient to analize water far <br />contaminationl <br />423 Centennial Building, 1313 Sherman Street <br />Denver, Colorado 80203 Tel. (303) 866-3567 <br />r' <br /> <br />