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<br />Roadside Mine. The mine is located at 4850 feet elevation and <br />receives an average of 8 to 10 inches of precipitation annually. <br />The surrounding vegetation is of the salt desert shrub community <br />type. <br />The mine has two refuse piles. One pile was completed last <br />year. Slopes are 2 1/2:1 with a north and northwest exposure. <br />Physical and chemical analyses of refuse material were conducted <br />and the results are presented in Table 5. These analyses <br />indicate that the material is non-toxic to revegetation. There <br />is a shortage of topsoil and other material to cover the pile. <br />The mine constructed experimental revegetation plots in 1983 <br />using varying amounts of topsoil to determine the minimum amount <br />of soil cover needed for revegetation. In 1986, sampling was <br />conducted to determine success on the various plots. Seedbed <br />depths of 6, 12, 24, and 48 inches were tested for percent cover, <br />production, shrub density, and species composition. Results of <br />the sampling are that: <br />- There is not a strong correlation between species <br />presence and soil depth; <br />- Total vegetation cover increases with soil depth up to <br />24°; <br />- Production increases with soil depth (48" excepted); <br />- total vegetation cover and production increases from the <br />3-6 <br />