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December 23, 1980 <br />Page 2 <br />Range t•7anagement Plan <br />• <br />The permanent overburden dump has areas which <br />form "natural" small valleys and also has a ridge <br />running in a north-easterly direction. <br />2. The steepness of the reclaimed slopes will range from <br />an average of approximately 3:1 to S:l.and flatter. <br />An overall slope of approximately 9:1 is expected. <br />3. The expected ranges in elevation on the reclaimed <br />surfaces are from 7300 feet to 7875 feet. <br />II CLIDSATIC FEATURES <br />1. Average annual precipitation in the Hayden Gulch area <br />is approximately 16 in (41 cm). This precipitation is <br />evenly distributed except that April, tiay, and October <br />receive slightly higher amounts of precipitation. <br />2. The mean date of spring in Hayden is May 27 and the <br />mean date of fall is August 26. Dates for the mine <br />area are slightly later for spring and earlier for <br />fall because the mine is approximately 1,000 feet <br />• higher than Hayden. <br />3. The average wind velocity is from 7-10 mph and is <br />normally from the southwest. <br />III PLANT SPECIES COMPOSITION AND USE FACTOR <br />1. PLANT SPECIES AND USE FACTOR <br />Vegetation expected after reclamation may consist <br />of the following forage species.. The projected proper <br />use factor by cattle is given for each species (Table 1). <br />IV TOTAL FORAGE PRODUCTION <br />Forage production is presently difficult to estimate <br />for reclaimed land. Using established reference areas as <br />a guide of biomass production it appears that a goal of <br />approximately 750 lbs/acre of air dried grass and forbs <br />will be needed to satisfy revegtation requirements. Of <br />this total not all will be useable by grazing animals. <br />Shrub production is not included. in the 750 lbs/acre <br />estimate. <br />• <br />