2023-02-03_REVISION - C1981010 (4)

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Division TalPac Time Time Description (min.) Description (min.) Truck Exchange Time 0.8 Queue Time at Loader 0.42 Spot Time at Loader 0.4 Truck Load Time 0.996 Average Loading Time 0.74 Haul/Return Time 2.225 Travel Time 2.52 Dump/Maneuver Time 1.2 Spot Time at Dump 0.3 Average Dump Time 0.2 Total Cycle Time 5.221 Total Cycle Time 4.58 It is observed the biggest comparison difference comes in Truck Load Time and Dump/Maneuvering time. However,when calculating Truck Loading Time from the provided information in Ta1Pac Summary(Appendix 2),the Division was unable to reproduce 0.74 minutes. Using Ta1Pac's 2.54 average bucket pass to load the haul truck with a 0.5 minute average bucket cycle time,it appears the total loading time should be 1.27 minutes. This brings the overall cycle time closer to the Divisions calculation which would reduce overall production calculated in Ta1Pac. Since these items are interrelated,they compound or have a"snowball"effect on the overall production calculated creating a difference between values found CIRCES vs. Ta1Pac. ■ Trapper: The next greatest cost difference was in Topsoil placement where Trapper's estimate was ($7,333,420), and the CIRCES estimate ($8,141,844), resulting in the CIRCES estimate being 808,424 greater than Trapper's. Below are some of the discoveries and observations: With respect to Truck/Excavator Topsoil placement: • CIRCES Task HNJ6(JPit Truck/Excavator Topsoil Placement): o Discrepancy of topsoil volume (Trapper 94,623 cy vs CIRCES 105,833; a difference of 11,210 cy). After discussions with Trapper,it was discovered Table A-2.5 was errantly excluded from the Trapper RCE which included detailed Scraper volumes for the J Pit. The Division's RCE has included an additional task for Scraper topsoil placement and adjusted Truck/Excavator topsoil placement volume correctly. See Tasks N16 and N16a. o Trapper used CAT385/CAT 777 equipment productivities & unit costs vs CIRCES use of CAT 6090/Komatsu 830E's. This resulted in a lower CIRCES Cost($114,491)vs Trapper($195,311); a difference of$80,820. o Despite the higher volume, and higher unit cost, the higher productivity of the CAT 6090/Komatsu 830E fleet resulted in fewer project hours, thus lower overall project costs o Because Trapper used the CAT 385/777 fleet, Trapper's productivity was lower, resulting in more hours to complete the project and greater total cost for the project. Trapper Mine RCE Memo February 3,2022