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Results As expected on steep slopes with a poor plant growth medium, the success at establishing vegetation was limited and overall per- cent cover is only 10%. Scattered individuals of Indian ricegrass, basin wildrye, and green needlegrass exist on these slopes. 81ue flax did particularly well on the slope with the trees and shrubs on it. Photograph 17 shows a few flax plants in October of 1980 and Photograph 18 shows the same area in June of 1981. Flax produces abundant seed that germinates and establishes readily on gravelly substrate such as exists on this slope. The irrigated basins where tree and shrubs were planted are serving as microsites for penste- mon, yarrow, basin wildrye, Sherman big bluegrass, and western wheat- grass. These islands of vegetation should provide the seed that will eventually colonize this slope. A high percentage (approximately 50-60 percent) of the rose tubelings that were planted on these slopes have survived and in time should provide cover for these slopes. Of the larger trees and shrubs that were planted, there are ten surviving junipers and five surviving pinyon, Survival of the gallon-size stock is estimated at 80 percent. The installation of plumbing in the spring of 1981, which will permit the drip system to be run on a time clock, should insure survival of the tree and shrub stock. Volunteer species such as bee plant, golden corydalis, Russian thistle, and a few leafy spurge plants are also present on these slopes. The golden corydalis and bee plant are becoming increas- ingly abundant as individuals are producing more seed. On the slopes under the tipple, numerous grass seedlings were evident when the reseeding and mulching were done in June 1981. It is hoped that the mulch will benefit these seedlings and not hinder their growth and that mortality resulting from slope disturbance while working m it is not high. Mulch Study Physical Characteristics In the summer of 1980 deceleration lanes were built on highway 789 and much of the slope below the parking lot was recut. The resulting slope was a steep (approximately 2 to 1) east exposure that was composed primarily of fill material. Various mulch materials were left from a study at Northern #1 mine and they were put on this slope for study purposes (Photograph 191.