Wellgreen Project Preliminary Economic Assessment ... - OTCIQ.com

HAULAGE
General Hauling Conditions
The 225 t hauler was selected to match the 21 m 3 diesel hydraulic shovel and 18 m 3
front end loaders in determining the number of trucks required for each operating
year.
Cycle times are based on estimated haulage profiles from the ultimate pit design
based on material types. It is assumed that the waste dump would be within 4,000 m
of the pit entrances and primary crushing facilities, located at the mill, within 8,000 m.
Haul Truck Productivity
Truck productivities are based on expected operating conditions, haulage profiles,
and production cycle times. Cycle times were calculated using Caterpillar FPC TM
commercial software. A weighted average cycle time for each year was calculated
according to its final destination (waste dump or crusher). Haulage analysis
assumptions are outlined in Table 6.
Table 6 Assumptions Used for Cycle Time Calculations
Units Value
Maximum Speed on Dump and Around Shovel km/h 20.0
Maximum Speed In-pit (and Ramps) km/h 40.0
Maximum Speed on Downhill for Safety/Account for Corners km/h 20.0
Loading Time (PC1250) min 4.5
Dumping Time min 0.5
Swell Factor % 30.0
Waste Rock Density (in situ) t/m 3 2.5
Mineralized Material Density (in situ) t/m 3 3.2
All ramps were assigned a grade of 10% in the pit and on the dumps. The road
grade for the road to the mill was assigned a grade of 5%.
SHOVEL AND TRUCK REQUIREMENTS
The haul truck requirement is initially 25 units of 225 t trucks and ramping up to a
maximum of 32 units of 225 t trucks in Year 31 due to the estimated longer cycle
times/increasing depth of pit. The truck requirements oscillate between the years
due to the combination of the fluctuations in total material mined, the location within
the pit that material in a year is being mined from (the effect of the different phases)
and this impact on the estimated cycle times. The truck requirements begin to drop
off in approximately Year 39 as the stripping ratio decreases. The yearly equipment
requirements are shown in Table 7.
Prophecy Platinum Corp, 8 1193460500-REP-R0001-00
Wellgreen Project Preliminary Economic Assessment,
Yukon, Canada