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<br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1 313 Sherman 51., Room 215 <br />Denver, CO 80203 <br />Phone: (303) 866-3567 <br />FA%:13031832-8106 <br />December 10, 1993 <br />Mr. Murari P. Shrestha <br />Western gels -Utah <br />405 Urban Street -Suite 305 <br />Lakewood, Colorado 80228 <br />Re: Review of 1993 Refuse Area Revegetation Report <br />Deserado Mine (C-81-018) <br />Dear Mr. Shrestha: <br />Roy Romer <br />Go~erno~ <br />Michael B Long <br />Division Dueclor <br />The Division has reviewed the 1993 Refuse Area Revegetation Report for the Deserado <br />Mine and has the following comments: <br />1992 data represents the 2nd growing season after planting while 1993 data represents the <br />3rd growing season after planting. As would be expected 1992 vegetation is dominated by <br />annual forbs. 1993 data shows an increase in perennial grasses, increase in annual grasses, <br />and a decrease in annual forbs. All the plots showed a decrease in total vegetative cover, <br />primarily explained by the substantial decrease in annual forbs. Although the 48" plots had <br />the lowest total vegetative cover, the existing cover was dominated by perennial grasses. <br />The report notes that the 12" plots had a higher total vegetative cover. It must also be <br />noted however, that the cover on the 12" and 24" plots was still dominated by annual forbs. <br />No perennial forbs were encountered on any of the treatments. The report lists <br />Chenopodium spp. as a perennial forb. Most Chenopodium are considered annuals. Lack <br />of a species identification makes it even less likely to consider this plant a perennial. <br />The increase in perennial grasses from 1992 to 1993 is encouraging and indicates that the <br />vegetation may be proceeding towards aself-perpetuating stand. The revegetation success <br />standards in the permit require a diversity of a minimum of 2 cool season perennial grasses, <br />and one forb. <br />iii iiiiiiiiiiiiiiii <br />999 <br />STATE OF COLORADO <br />OF ~~ <br />~E 4 <br />~~ <br />he <br />~•~~ <br />~ ~e]6 <br />Productivity was extremely variable. Ten 1 MZ quadrats were collected for productivity from <br />each plot. Sample adequacy was only achieved on plot S2. Since productivity was not <br />