Laserfiche WebLink
<br />C <br />February 24, 1982 <br /> <br />DEPARTMENT OF NATURAL RESOURCES <br />D. Monle Pascoe, Er, e<u live Der ector <br />MINF~U LAND KECLAA1ATlON <br />423 Centennial Budding. 1313 Sherman Street <br />Denver, Colorado 80203 Tel. F3~,6-35(17 <br />Larry Jackson <br />Yampa Pfining Company <br />P.O. Box HH <br />Hayden, Colorado 81639 <br /> <br />• II ` ------~ <br />IIII~III~III III <br />I <br />S inTL~ OF COI VR4f10 44 uArIn U,~N,I LI. 'l,.v i.~•~. ~~ ^ <br />999 <br />David C. Shelton <br />Director <br />RC: Species diversity success criteria for the Ilayden Gulch Mine <br />Dear Mr. Jackson: <br />In lieu of requiring all operators to develop a species diversify standard <br />based on the Shannon-Wiener Index, the Uivision has been considering alternative <br />methods of analyzing reclaimed areas to determine if the}' have an adequate <br />diversity of vegetation. <br />One of these methods uses species composition of the pre mine surface to <br />determine a success standard for reestablishing a diverse vegetative cover. <br />In addition to species composition, general life forms (grasses, forbs, and <br />shrubs) and seasonality of the revegetated area will he considered Co insure <br />that the total community illustrates an acceptable diversity. <br />In the case of the H-G mine I have ranked herbaceous species within each <br />community by relative cover. Por each community I plotted changes in the <br />relative percent cover to determine points aC which the contribution of <br />relative percent cover by adding additional species becomes negligible <br />(please see attached tables). Additionally the Division staff feels that <br />species/life forms which are represented by 5% relative cover in the premining <br />vegetative community should be represented in the re.c.l.ainwd surface. <br />On this basis I would make the following recommendations for species diversity <br />criteria for each community at the {I-(; mine. <br />STcPf~ <br />