Laserfiche WebLink
The Division has noted this discrepancy in the provided Trapper's RCE.No changes were applied to the <br /> Division's RCE. <br /> • Also, the L Pit and N Pit Truck/Excavator costs, in the CIRCES estimate, were based on <br /> CAT 385/777 fleets, whereas in the Trapper estimate they were based on CAT <br /> 6090/Komatsu 830E productivity and unit costs. <br /> L Pit and N Pit Truck/Excavator support equipment, fleet and%utilization have been updated for <br /> accuracy and consistency. <br /> • The three largest differences in Truck/Excavator Backfill& Grading costs are seen in the <br /> CPit($1,538,685),L Pit(-$1,458,159), and NPit(-$2,343,561) estimates. In these <br /> cases, the higher values are from the CIRCES Estimate. <br /> • In regards to C pit, since the fleets were the same in the estimate (both Trapper& <br /> CIRCES), the question of the difference in haul simulation arises, in that, 693 more hours <br /> (than Trapper's est.)were required to complete the task in the CIRCES estimate. <br /> • With respect to L and N Pits, the difference in productivities and hours may possibly be <br /> (more, or less), attributable to the differences in equipment fleets (i.e. CAT 60901 <br /> Komatsu 830E vs CAT 3851777). <br /> • A better understanding of how CIRCES'haul simulation estimates productivities and <br /> project completion hours may shed light on why there appears to be differences with <br /> Trapper's haulage simulation program "TalPac". <br /> As noted earlier in this letter by the Division,support equipment and%utilitzation for Truck/Excavator <br /> tasks have been updated which partially contributed to some of the differences observed between TalPac <br /> and CIRCES.However,the majority of these cost differences can be summarized in the difference <br /> between how TalPac and CIRCES applies assumptions and correction factors along with a potential error <br /> in TalPac cycle times. In order to perform an equal comparison,the Division calculated a"test" <br /> Truck/Excavator task using "L Pit Sec 401,700"and compared it to the provided TalPac Production <br /> Summary—Full Simulation for that that task. These summaries are provided at the end of this letter under <br /> Appendix 2. What the difference and its impact on direct cost for Truck/Excavator tasks that were found <br /> were: <br /> 1. Job Condition Correction. CIRCES takes into consideration an applicable correction factor for <br /> job site condition of 0.83.This correction is applied to the overall LCY/hour productivity <br /> calculated which reduces the productivity by 17%. While Trapper recognizes the Job Condition <br /> Correction of 0.83 in the provided Table A-2.8,when reviewing the TalPac Production Summary, <br /> it does not appear it has been applied to Trapper's productivity. This leads to a larger productivity <br /> in LCY/hour compared to CIRCES. <br /> 2. Average number of loader bucket passes to load a haul truck. CIRCES rounds down the nearest <br /> whole bucket pass. It appears based on the production summary,TalPac caries through partial <br /> bucket passes in its calculation.This leads to increased haulage amount per truck compared to <br /> CIRCES. <br /> 3. Cycle Time (potential TalPac error).The following table is a comparison of the Division and <br /> TalPac cycle time for the associated task: <br /> Trapper Mine RCE Memo February 3,2022 <br />