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1 <br />' Bartle Mountain Raourcea, Inc. <br />12 Permit Modification <br />' A laboratory testing program to geochemirally characterize the waste <br />' rock from the San Luis Project was outlined in the appr~ved permit. The <br />results from the testing program indicate that no acid production or leaching <br />of degradational quantities oftals or other constituents from the waste <br />' rock is expected to occur. <br />The following discussion of the waste rock geochemistry is condensed <br />from Section D.3.3.2 of the approved permit, The waste) rock tested for the <br />approved permit included samples from each type of wasted rock. A list of the <br />' sample types and descriptions of the testing conducted w~tich pertain to the <br />backfill material aze given in Table D.3.3-1. Test resmts aze included in <br />' Appendix A of this submittal. <br />Battle Mountain geologists familiaz with the geolog~c characteristics of <br />' the San Luis Project identified four separate and distin waste rack types <br />present on site. Three of the four types of waste rock pled will oceur in <br />the pit backfill material. The fourth waste type, muds rte and green clay <br />' associated with faulting, will not occur in the backfill ma rial and will not be <br />discussed further in this document. The geologists selected core to be used <br />' in the geochemical testing program based on criteria established by the Project <br />Geochemist. The criteria included selecting a sample ~at was considered <br />a sufficrent amount of matenal was available m the core selected to complete <br />the testing. Battle Mountain geologists first reviewed th drill logs for drill <br />' holes which had been cored. They then selected potential rill holes with logs <br />which met the criteria. The core from the selected hobs was examined to <br />verify the logs. t~ttce Battle Mountain geologists had dete(~mined that the core <br />met the criteria, the core was shipped to the Project Engineer's laboratory for <br />' development of a composite sample. <br />Laboratory personnel, in consultation with the F+roject Geochemist, <br />' selected two distinctively different samples for each of t~e ruck types. The <br />two different samples were selected in an attempt to model both expected <br />' overall conditions and expected worst case conditions. In the case of the <br />Santa Fe Conglomerate and the pink gneiss, the samples iwere selected based <br />on color differences, indicating either a compolsition change or <br />' %Y p.7 sect o. _ <br />°~ representative of the general rack type being tested, sel ling a sample that <br />', might represent a worst case for the rock type being tested, and ensuring that <br />>~~ ~ <br />