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• • iiiiiiiiiiniiiiii <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Phone: (3011 R66-J567 <br />FA%: (3031 832-8106 <br />DATE: May 17, 1993 <br />OF' ~o( <br />~~ ~q <br />N~~~ : ~\ <br />p'i <br />•~~ B <br />Roy Romer <br />Goeernur <br />Michael B LnnR <br />Divi~inn Dire<br <br />TO: Steve Shuey ~} <br />FROM: Randy Price,? <br />RE: Orchard Valley (C-81-038), TR-22 for Incidental Boundary Change <br />I have reviewed Orchard Valley's request for an incidental boundary change to add <br />approximately 60 acres to the permit area and to allow mining within lease modification <br />COC-37210M. I concentrated my review on groundwater concerns. <br />The TR request was well documented and prudent. I think that mining, as proposed by <br />the Orchard Valley mine, can be done with reasonable confidence that it will not have <br />adverse hydrologic consequences to the Upper Cabin Creek spring. There is sufficient <br />vertical cover and horizontal buffer to prevent subsidence of the spring and the <br />associated alluvial/ colluvial aquifer. The mine has an extensive monitoring plan that <br />will detect diminution of water resources of Cabin Creek and has proposed a mitigation <br />plan should there be adverse effects. <br />I have no concerns with the proposed plan. I would like to be kept informed of BLM's <br />review of the mine plan modification. <br />