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;: <br />..; . <br />• • III IIIIIIIIIIIII III <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />131 J Sherman SI , Room 215 <br />Denier. Cobrado 80?OJ <br />Phune: p03) 866-3567 <br />FAX tS~~3031 83?-8106 <br />IJATE: April 10, 1997 <br />TO: Harry Ranney <br />FROM: Dan Mathews <br />RE: Chimney Rock Mine (C-81-023) <br />Revegetation Evaluation for Phase 2 Bond Release <br />/~.. <br />~~~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Rov Romer <br />Governor <br />~.rmex S. Lochhearl <br />Executive Direcla <br />Michael B. Lnng <br />pivixion Director <br />I have reviewed the amended bond release application received in <br />our office on March 20, 1997, to evaluate the extent to which <br />adequacy items addressed in my January 30, 1997 memo were <br />addressed. The following items correspond to the concerns <br />identified in that memo. In summary, my concerns were adequately <br />addressed, with one exception relating to AVF production sampling <br />specified in Item 6. <br />Also, note that the document indicates that the field bindweed <br />infestations which occur on portions of the East Pit and the 1991 <br />AVF area will be treated beginning this field season. I assume the <br />weed control plan in the permit will need to be revised to <br />accomodate this. <br />If bindweed was included in the production data, I would recommend <br />that phase 2 bond release not be granted for the 1991 AVF area. <br />For the remaining areas, I believe the vegetation data and site <br />inspection, along with the commitment to manage the bindweed, <br />indicate that vegetation criteria for phase 2 bond release have <br />been met. <br />Call me if you have any questions. <br />1. Information regarding management practices incorporated as <br />requested. Includes commitment to revise permit to include field <br />bindweed control in weed management plan. <br />2. Parcel acreages provided as requested. Sampling intensity <br />ranged from a low of .33 samples per acre on larger units to a high <br />of 3 samples per acre on smaller units. Relatively small sample <br />sizes appropriate in light of acreages involved. <br />3. Commitment included to treat apparent infestations of field <br />bindweed, which apparently have not previously been identified as <br />a problem at the site. <br />