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ERO Resources <br />influence of this disturbance, as compared with natural allelochemical <br />• effects of greasewood, on the herb layer are difficult to assess. In <br />areas where adjacent disturbance is marked, a decline in the extent of <br />this vegetation type might be implied. In such places the <br />sagebrush-greasswood bottoms occupy narrow strips strictly limited to the <br />near -barks of the stream courses. <br />• <br />• <br />The big sagebrush-greasewood type will be affected by mine development <br />operations including construction of mine portal facilities, haul and <br />access roads and waste disposal sites. These operations will remove areas <br />of the type and damage other areas adjacent to construction. As a result <br />of the specific environmental factors controlling the occurrence of this <br />vegetation type, replacement of the stands during revegetation will be <br />difficult and impractical. Eventual reinvasion of drainage ways <br />established in disturbed areas may reestablish the shrub layer. <br />II.F-51 <br />