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2020 and 2021 Reclaimed Areas Phase III Vegetation Cover Success Criteria <br /> 2020 Extended 2021 Extended 2020 Reclaimed 2021 Reclaimed <br /> Reference Area Reference Area Areas Areas <br /> Xbar 11.06%(1) 11.74%(1) 55.87% 59.33% <br /> S 5.63% 7.52% 7.98% 9.96% <br /> Number of samples 15 15 15 15 <br /> Number of samples for 1 2 4 5 <br /> sample adequacy <br /> (1)Vegetation success criterion is the total herbaceous cover of the extended reference area <br /> (sum of graminoid and forb cover) <br /> Based on the results of the quantitative sampling, the reclamation areas exceeded the <br /> revegetation total live vegetation cover success criteria of 11.06 (2020) and 11.74 (2021) <br /> percent, thereby meeting the revegetation success criteria and supporting the post-mining <br /> land use. <br /> Reclamation Success: Total Herbaceous Production (2020 and 2021) <br /> Demonstration of herbaceous production revegetation success at the Elk Creek Mine for <br /> Phase III bond release requires that the total herbaceous production at the eligible reclaimed <br /> areas meets or exceeds the value of the total herbaceous production value calculated from <br /> the Mountain Shrub Extended Reference Area. The table below compares the vegetation <br /> cover values from the 2020 and 2021 sampling. <br /> Reclamation Success: Total Herbaceous Production Success (2020 and 2021) <br /> 2020 Extended 2021 Extended 2020 Reclaimed 2021 Reclaimed <br /> Reference Area Reference Area Areas Areas <br /> Xbar 59.33 g/m2 64.91 g/m2 198.81 g/m2 167.32 g/m2 <br /> S 15.45 g/m2 19.08 g/m2 31.97 g/m2 34.89 g/m2 <br /> Number of samples 15 17 15 17 <br /> Number of samples for 12 16 5 8 <br /> sample adequacy <br /> Based on the results of the quantitative sampling, the reclamation areas exceeded the <br /> revegetation total herbaceous success criteria of 59.33 g/m2 (2020) and 64.91 g/m2 (2021) <br /> percent, thereby meeting the revegetation success criteria and supporting the post-mining <br /> land use. <br /> Reclamation Success: Species Composition (2020 and 2021) <br /> The Elk Creek Mine permit document specifies that to meet the requirements of the <br /> revegetation success criterion for species composition, species composition on any <br /> applicable reclaimed areas will be successful when there are three or more perennial or <br />