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Page A-2 <br />APPENDIX A <br />CALCULATION OF THE HEIGHT OF THE CAVING ZONE <br /> <br />Depth Idealized Stratigraphic Cross Section of Boies Bed <br />Nahcolite Content <br />10' L-SE 80% <br />20' L-SB and L-SC 50% <br />22' L-SA (Upper Boies Bed) 80% <br />5' Oil Shale Mazker Bed 50% <br />3' Lower Boies Bed 80% <br />The equivalent thickness of nahcolite: <br />H= 10' x 80%+20' x 50%+22' x 80%+5' x 50%+3' x 80%=40.5'. <br />With 40% extraction of the nahcolite reserve, the extraction equivalent thickness is: <br />40.5' x 40% = 16.2' . <br />Scenario A. In the Environmental Impact Statement, a bulking factor of 1.3 was used. <br />i The following formula was used for predicting caving zone: <br />`-` (A-1) <br />H= k_~, <br />where His the height of the cavity zone, <br />h is the mining height, and <br />k is the bulking factor; <br />therefore, <br />H = is-Zt = 48.6 (A-2) <br />Scenario B. Also assuming a bulking factor of 1.1, the caving zone height is then <br />H = i=?~ = 162 (A-3) <br />Agapito Associates, Inc. <br />