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Larcnato Canvon Mine - Geolo¢v rrchnica( ReDOn <br />• Sodium Adsomtion Ratio <br />The average sodium adsorption ratio was 19.0 with a range of l.0 to 41.4. According to <br />Wyoming DEQ Guidelines overburden with SAR values above 15 are not suitable for reclamation <br />success. Since SAR values exceed 15, a four foot thick layer of top soil cover will be placed over <br />the overburden and should have a good reclamation suitability. <br />Ciruela Coal Floor <br />Table G9 summarizes floor geochemical analyses. <br />The average selenium concentration was 0.073 mg/Kg with the highest concentration being 0.136 <br />mg/Kg. According to the Wyoming Guidelines, selenium concentrations that exceed 0.1 mg/Kg <br />are mazginal for revegetation. However, these materials will be mixed with remaining overburden <br />materials reducing the selenium concentrations. Therefore, no problems concerning selenium and <br />revegetation aze anticipated. <br />• The average sodium adsorption ratio was 24.70 with a range of 2.06 to 35.80. According to <br />Wyoming DEQ Guidelines overburden with SAR values above 15 aze not suitable for reclamation <br />success. Since SAR values exceed 15, a four foot thick layer of top soil cover will be placed over <br />the overburden and should have a good reclamation suitability. <br />Primero Coal Roof <br />Table G-7 summarizes roof geochemical analyses. <br />The selenium concentrations for the two samples analyzed were 0.128 mg/Kg and 0.101 mg/Kg, <br />respectively. These values slightly exceed Wyoming Guidelines. However, this material will be <br />mixed which should reduce the concentrations. Therefore, these values would not interfere with <br />the hydrologic balance or reclamation activities. <br />The sodium adsorption ratio for the two samples analyzed was 37.90 and 23.90, respectively. <br />According to Wyoming DEQ Guidelines overburden with SAR values above 15 aze not suitable <br />for reclamation success. Since SAR values exceed 15, a four foot thick layer of top soil cover will <br />be placed over the material and should have a good reclamation suitability. <br />~1 <br />Geologp475/December l6, 1996 27 <br />