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Table 6-12 <br /> Chemical and Physical Properties of Interburden <br /> Sandstone (Unit 3) for <br /> Phase II Samples Collected at Nulca Mine, <br /> November, 1986 <br /> Parameter Phase II Hole Number <br /> Units 873E 874E 875E 876E Mean SD <br /> pH 4.6 5.3 4.7 7.6 5.5 1.4 <br /> EC4, mmhos/cm 2.3 4.3 2.7 4.2 3.4 1.0 <br /> SPS, % 32.6 36.4 31.9 36.2 34.3 2.4 <br /> Ca , meq/1 15.8 -- -- -- 15.8 -- <br /> Mg,meq/1 3.7 -- -- -- 3.7 -- <br /> Na, meq/1 6.4 -- -- -- 6.4 -- <br /> SAR6 2.6 -- -- -- 2.6 -- <br /> Total S, % 0.28 0.63 0.09 0.26 0.32 0.23 <br /> Sulfate S, % 0.22 0.49 0.02 0.25 0.25 0.19 <br /> Pyrite S, % 0.05 0.13 0.06 0.00 0.06 0.05 <br /> Organic S, % 0.01 0.01 0.01 0.01 0.01 0.00 <br /> NP7 1.7 2.1 0.4 4.4 2.1 1.7 <br /> ABP8 -0.2 -2.2 -1.8 4.1 0.0 2.9 <br /> Fe, ppm 75.2 23.9 25.1 1.3 31.4 31.2 <br /> Mn, ppm 5.4 3.6 0.3 0.2 2.4 2.6 <br /> Ni , ppm 0.3 -- -- -- 0.3 -- <br /> Zn, ppm 0.9 -- -- -- 0.9 -- <br /> Mo, ppm 0.1 -- -- -- 0.1 -- <br /> 1 Unit 3 consists of brown and light brownish gray sandstone interburden <br /> material . <br /> 3For drill hole location, see Exhibit 6-3A, Overburden Sample Locations . <br /> 4SD-Standard Deviation. <br /> EC-Electrical Conductivity. <br /> 5SP-Saturation Percentage. <br /> TSAR-Sodium Adsorption Ratio. <br /> NP-Neutralization Potential ; Units are tons of CaCO3 required per acre <br /> 8furrow slice. <br /> ABP-Acid Base Potential ; Units are tons of CaCO required per acre furrow <br /> slice; ABP was calculated from Pyrite and Organ c S. <br /> 6-47 Revised 11/01/86 <br />