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<br />DEPARTMENT OF NATURAL RESOURCES <br />D. Monte Pascoe. Executive Dneclor <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON Director <br />Richard D Lamm <br />Governor <br />T0: Mike Long <br />FROM: Dan Mathews ~7C~-,~~ <br />RE: Species Diversity Standard - Deserado Mine <br />The Deserado permit application identifies eight major vegetation communities <br />that will be disturbed by mining activities. The reclamation plan includes <br />two separate, permanent seed mixes, based primarily upon depth of soil <br />replacement and topographic position followin_q mining. Seed mix No. 1 is <br />designated as the Juniper Woodland/Mixed Grass Upland/Sagebrush Grass Upland <br />mix. Seed mix No. 2 is the Mixed Grass Lowlands/Sagebrush Lowlands Mix. I <br />recommend that a single species diversity standard be applied to all reclaimed <br />areas at the mine. <br />Upland Communities <br />Below, I have ranked herbaceous species within the major upland communities <br />by relative cover. The dominant, subdominant and other major species are <br />relatively easy to discern. In addition to species composition, life form and <br />seasonality of the revegetated area is included in the diversity evaluation. <br />The sagebrush-wheatgrass (0011) community is the most diverse upland community, <br />and contains 2 perennial cool season grasses and 2 perennial forbs which <br />contribute in excess of 5% relative cover. The majority of the other upland <br />sampled stands contain 1 perennial cool season grass and 1 or no perennial <br />forbs contributing in excess of So relative cover. <br />For areas seeded with seed mix No. 1, based on the above criteria, I recorrmiend <br />the following diversity standard: At Least two perennial cool season grasses, <br />and at Least one forb, each [with a relative cover equal to or greater than 30. <br />Any 3 species combined should not exceed 80o relative cover, and no one species <br />should exceed 600. <br />Upland Communities <br />March 16, 1982 <br />Sagebrush-Wheatgrass (0010) <br />Spp. <br />Li fe Form <br />Rel. Cover <br />Agropyron spicatum <br />Bromus tectorum <br />Cr, Cool <br />Gr, Rnn ual <br />64.62 <br />17.56 <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />