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56 <br />• <br />1 <br />2 <br />Santa Fe Formation. And apparently -- I think you <br />said the stuff above that was potentially unstable? <br />MR. RENNER: Well, on the Santa Fe <br />itself is where we're concerned about stability. <br />MR. DANIELSON: It's not -- okay. <br />What is the grout curtain going to go down to? <br />MR. RENNER: The grout curtain is <br />going to go through the alluvial materials to the <br />contact with the consolidated Santa Fe Formation, and <br />the problem being when the Santa Fe is consolidated, <br />when it's really tough, it's going to stand. <br />The problem is if you have weathering <br />of the upper portions of the Santa Fe and making the <br />distinction between the alluvial materials and the <br />Santa Fe -- the distinction is very unclear. It's <br />mixed together. <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />• 13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />21 <br />22 <br />23 <br /> <br />24 <br />25 <br />It's that weathered portion of the <br />Santa Fe that concerns us essentially with <br />stability, so the grout curtain would extend through <br />that weathered portion into the consolidated Santa <br />Fe, and the buttress itself would act on the pit <br />site to hold that portion of the Santa Fe in place. <br />MR. DANIELSON: How long do you <br />anticipate we would continue to hold the bond in the <br />postmining era in order to see whether that pit fills <br />