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Trapper Mining, Inc. <br />C- 1981 -010; PR7 <br />Adequacy Review No. 2 <br />Page 13 of 15 <br />Tlliere is uio highwall reductions do illiuig aid blasting required for 1F or Z dip pits iui that these pits <br />lliave both beeui uninned out, backfilled, annd graded, aund there is no fnall highevalll to drill & blast. <br />Tllierefore, iio Drill & blast costs are included iii tllie bo ld estimate. <br />Witli respect to 1F pit, there should never have beeui a highwall reductioui drill & blast estimate <br />subunitted evitlli PRO, iui that 1F pit's friial cut (whiclli was iui tllie worst case bo ld Year of 20 t2) tied iii <br />to the spoils of the previousle unified out Z strike pit o f the east side of 1F pit. The last cut iii 1F pit <br />had spoil of both sides of the pit (i.e., iio highwall). <br />Z dip pit does uiot have a lu fall highee all that requires drdhng aid blasting either. K strike pit <br />iuitersects the lunall unified out cut (# 12) of Z dip pit f oun the southeast. K pit has advanced <br />uiorthevard bee and the Z dip pit void evhich has beef backlulled ee ith the spoil geuierated frown K pit <br />uniuiing operations. Thus, there is iio higheeallll requiring drdhng aid blasting, avid therefore, iio costs <br />for these actie hies evere included iii the PR7 bond estimate. <br />AE pit drdhng aid blasting costs iv ere i fade erte itllv left out of the originall PR7 Bo id ]Estimate <br />subunittal. Approxiunatell' `75,000 has beeui included to cover the drilling & blasting costs for AE <br />pit iii the grading section of the bond estimate as requested by the Divisioui (enclosed Table A -5.1). <br />b. Division's Response: The Division is conducting a cost estimate based on our November 12, 2013 <br />meeting and the subsequent approvals of the SL 14 and SL 15 bond release applications as well as <br />the information provided in the adequacy review response. <br />33. The current cost estimate includes a cost to regrade the K -Pit using a truck/shovel team. Table 1.4 -2 in the <br />current permit indicates the volume of material necessary to move for this task is 5,644,528 cubic vards. <br />The proposed table A -4.4 indicates only 2,818,014 cubic yards of material is necessary to complete this <br />task. This is a reduction of 2,826,514 yards. It does not appear that K -Pit parcels have received Phase I <br />bond release. Give this; please explain this significant reduction in material volume. <br />a. Trapper's Response: As per tlne meetinng onn November 12, 2013, the issues regardiIlig the release <br />of habihty associated evith the Phase Bo id Release process as it relates to the PR7 perunit revision <br />iv ere addressed (see hewn # 27 response). <br />At the time that PRO was subunitted (2007), approxiunatelle 5.6 undho i cubic'Yards of unateriall was <br />estimated to be hauled back frown the Horse Gulch ]Fill (task # 25 in the Bo id estimate) to assist <br />with the backlull of K pit b�- the truck /loader operation. After the PRO subunittall aid the <br />perforuna ice bouid was estimated, a nnnunber of changes iv ere unade that impacted the design, <br />volumes, aid methods of backlull iui K pit. Less out of pit spoil was allowed to be placed iii the <br />Horse Gulch ]Fill (25 unillion cods vs. 35 undho i applied for). 1n addition, Agapito & Associates <br />changed their recounme idatioui o f the buttress lull oui the uiorth hinits of K pit by iio longer requiring <br />a buttress at allll. This further reduced available dump rooun. Trapper them hauled approxiunatele 7 <br />unillion c,,\-ds of unatenall frown K pit to 1F pit for ]mall pit backlull there. This still resulted iii over 3 <br />unillion cods of unatenall reunaiuiing that would have to be hauled somewhere else. To address this <br />issue, a plan was developed to allow the dragh ie operation to remove the M seaun aid Q seaun <br />interburde is (that evere previousl' pllanmd to be reunoved be the truck/loader operatioui aid taken to <br />the Horse Gulch Fill) aid to place unore unateriall ­iii pit- <br />Note: There is a discrepa ice betweeui the hewn + 25 on the snnunmar page ($7,872,034,99) of the <br />RN -06 Circes rim aid the hewn # 25 worksheet aunowit ($7,032, <br />