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2.o5.s(s> <br />(f)(iii) A narrative of the detailed description of the measures to be taken to prevent <br />subsidence from causing material damage or lessening the value or <br />reasonably foreseeable use of the surface follows: <br />(f)(iii)(A) <br />The anticipated effects of planned subsidence is explained above and is <br />presented in detail in Volume III, Exhibit 15. <br />(f)(iii)(B) <br />The measures to be taken in the mine to reduce the likelihood of subsidence <br />is explained above. The mine plan will leave support pillars under Pond P-1, <br />adjacent to Hubbard Creek, under Rubin Dove's rock shelter, under <br />perennial portions of Dove Gulch and near the outcrop. The long term <br />stability of the support pillars was evaluated in Volume III Exhibit 15, Section <br />1.9. The pillars in the bleeder entries along Hubbard Creek have a <br />calculated factor of safety of 4.3. The pillars in the main entries under Dove <br />Gulch and Rubin Dove's rock shelter have a calculated factor of safety of <br />• 1.8. To assure long term stability, a pillar must have a factor of safety of 1.5 <br />or greater. No backstowing or backfilling of voids will be pertormed. <br />A limited extraction zone was established along the bleeder entries in the <br />vicinity of Freeman Gulch and the vent shaft in Freeman Gulch to assure <br />ancient land slides were not reactivated by subsidence. <br />A detailed subsidence study for Terror Creek Reservoir and dam will be <br />completed prior to any mining within one mile of the reservoir according to <br />the schedule outlined above. <br />Mining in low overburden areas adjacent to the possible fault trace is <br />explained in section (f)(ii)(B) above. <br />(f)(iii)(C) <br />No measures will be taken on the surface to prevent material damage or <br />lessening of the value or foreseeable use of the surface. <br />(f)(iv) A detailed description of the measures to be taken to mitigate the effects of <br />any material damage or diminution of value or foreseeable use of lands <br />. which may occur. <br />PR-04 2.05 - 110 - 02!01 <br />