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• Evaluation of Species Suitable to Include in Trapper Mine's Species Lists <br />Three separate mixes of plant species will be used for revegetation at Trapper Mine based upon the site <br />characteristics and revegetation objectives of different areas. Two different mixes will be used for <br />returning rangeland to perennials. These mixes are largely reflective of the three range sites occurring <br />on the proposed permit area before mining, i.e. mountain shrub high and low elevation and sage-grass. <br />A third mix will be used for revegetating temporary disturbances such as roadsides, sediment dams and <br />topsoil stockpiles. <br />The list of species these mixes will be developed from and their land use suitability are described in the <br />remainder of this section. From each species list, a specific mix will be prepared in any given year. A <br />mix will include a minimum number of genera from the appropriate species list. Selection from the lists <br />will be dependent upon availability of seed and seedlings and past performance of the species. <br />A list of perennial plant species and an evaluation of pertinent characteristics are presented in Tables <br />3.6-1 a through 3.6-3e. The list contains all species selected for inclusion into the three site specific <br />species lists presented later in this section. Native species were initially chosen on the basis of percent <br />• diversity that each contributed to the range site in which it occurred. Other natives were selected from <br />the list of perennial plant species shown in the Plant Information Net work (Colorado State University, <br />1977). Once a complete list was compiled, a check was made to determine if each of the species were <br />available from suppliers. The final list as shown in the above referenced tables consists of native and <br />naturalized species which are commercially available and introduced species recommended by the local <br />SCS and various other authorities. <br />The lists of available plant species and associated characteristics were then used as the basis for con- <br />struction of each of the three site specific seed and shrub planting lists. Each list was based upon select- <br />ing those species which according to range site vegetation data, occurred prior to mining; are listed in the <br />SCS Planting Guide for a particular range site; and are suitable for the post mining land use. (The SCS <br />planting guide uses climatic zones as discussed in following portions of this section.) Special category <br />mixes and associated plant species were developed to maximize potential vegetation benefits for a <br />given conservation activity. Appropriate species were then selected from the list to satisfy the purposes <br />of the species mix. <br />x//4/97 <br />3-86