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TABLE 6-4A Weighted Average Physiochemical Characteristics of the Overburden from the Southern Mine Block, Seneca IIW Mine Site Location "' Parameter "' 217C 286C 3080C 3152C Average Overburden Thickness, feet 96.0 104.1 51.0 34.5 -- pH, Paste 7.4 7.4 7.8 7.8 7.6 Saturation Percent, % 53.0 56.0 32.8 32.3 43.5 Conductivity, mmhos/cm 3.6 3.5 0.7 0.8 2.2 Sodium, meq/I 3.7 4.1 0.9 0.7 2.4 Calcium, megll 1 B.0 19.4 3.0 4.4 11 .2 Magnesium, meq/1 35.4 28.0 3.7 4.1 17.8 Sodium Adsorption Ratio 0.8 0.9 0.5 0.4 0.7 Sand, % 16.7 20.0 29.4 35.9 25.5 Silt, % 41.2 42.0 51.4 49.4 46.0 Clay, % 42.1 38.1 19.2 14.7 28.5 Very Fine Sand, % 12.5 13.2 NA NA 12.9 Total Sultur, % ~~' U.62 0.40 0.04 0.06 0.28 Neutralization Potential "' 51.5 51.0 57.4 80.9 60.2 Acid-Base Potential "' 32.0 38.7 56.4 79.1 51 .5 Aluminum, ppm NA NA NA 151 151 Ammonium-Nitrogen, ppm NA NA 2.7 2.6 2.7 Arsenic, ppm NA NA NA 151 151 Boron, ppm'' 0.8 1.0 NA 0.2 0.7 Cadmium, pPm '~' NA NA NA 0.06 0.06 Chloride, ppm NA NA NA 10.0 10.0 Chromium, ppm NA NA NA 151 151 CoPPer, pPm '~' 14.2 13.1 NA 1 .0 9.4 Fluoride, ppm NA NA NA 0.7 0.7 Iron, ppm NA NA 18.4 10.5 14.5 Lead, ppm NA NA 0.8 0.7 0.8 Manganese, pPm'" NA NA 8.9 4.2 6.6 Mercury, ppm NA NA (51 l51 151 Molybdenum, ppm "' 151 151 NA 0.03 0.03 Nickel, ppm't' NA NA NA 0.9 0.9 Nitrate-Nitrogen, ppm NA NA 1.7 1.6 1.7 Selenium, ppm "' NA NA NA 0.05 0.05 Zinc, ppm "' NA NA 3.3 2.7 3.0 ' For drill hole location, see Exhibit 6-6A. ~ The following abbreviations are used: %= percent; mmho/cm = millimhos per centi meter; meq/I = millieq uivalents per liter; ppm = parts per million, and NA = no analysis. ' Values were adjusted for less than values according to Hilton (19841. Unit is tons calcium carbonate equivalent per 1000 tons o f overburden. All mean values were less than the detection limit of 0.20 ppm for aluminum, 0.05 ppm for arsenic, 0.01 ppm for chro mium, 0.20 p pm for mercury, 0.6 pPm for molybdenum, and 0.01 ppm for selenium. • ~ ~ • Revised 9/9