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BMRI -San Luis Pif Bac~ll: Sequential Batch Tests of Gneiss <br />Table 6: pH, Alkalinity and Conductivity for Maximum, Minimum & <br />Median S(total) Pink Gneiss Samples Across leach Cycle (Water <br />Rock Ratio from 1: 4 to 4:1) <br />Test / <br />Parameter S(t) <br />(~) Cl <br />(1:4) Bl <br />(1:2) Al <br />(1:1) A2 <br />(2:1) A3 <br />(4:1) GW <br />Head <br />Test 6 5.01 <br />pH tsu~ 8.08 8.17 8.25 5.33 8.28 8.20 <br />Alk 78 109 115 151 154 186 <br />omen <br />c.cos~ <br />Cond 857 755 670 648 661 572 <br />c~ <br />Test 4 0.42 <br />pH cNl 8.39 8.35 8.34 8.30 8.36 8.20 <br />Alk 139 140 148 156 170 186 <br />omen <br />cocos> <br />Cond 698 662 613 626 643 572 <br />as <br />Test 2 0.62 <br />pH tn~ 8.30 8.30 8.26 8.26 8.42 8.20 <br />Alk 131 146 169 162 159 186 <br />omen <br />cocos~ <br />Cond 821 776 678 625 595 572 <br />c~ <br />The rock designated for backfilling the West Pit come from the unmineralized and <br />unaltered hanging wall rocks that are currently being mined (Jones, 1994). The <br />backfill will predominantly comprise two geologic units, the Santa Fe Formation <br />(interbedded silts, sands and gravels of Tertiary age) and Precambrian Pink Gneiss. <br />There may be minor amounts of Tertiary fault gouge from the dislocation surface that <br />separates the hanging wall from the mineralized foot wall of the mined area. All gold <br />mineralization and the hydrothetmal alteration associated with it are localised in the <br />foot wall rocks, Precambrian biotite-amphibole quartzo-feldspathic gneiss is distinct <br />from the Pink Gneiss both visually and structurally (i.e., by the Tertiary fault gouge). <br />Detailed discussion of the geology, mineralogy and alteration of the rock units is <br />presented in Jones (1994), submitted to the Division in May, 1994. <br />Geochimica, Inc. S 95021/2b5ep-95 <br />