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

Year 39, the number of shovels required is three. In the final three years of the
schedule, the shovel requirement decreases to two.
The shovel size has been matched with 225 t haul trucks to provide a swing cycle of
35 s and total truck load time of 4.0 min in six passes for waste material and 3.4 min
in five passes for mineralized material. Suitable number of loading passes typically
falls within the range of three to seven.
Shovel base productivities were calculated using the sample parameters in Table 5.
Table 5 Sample Shovel Productivity Calculation
Prophecy Platinum Corp, 7 1193460500-REP-R0001-00
Wellgreen Project Preliminary Economic Assessment,
Yukon, Canada
Units
Waste
Shovel
Mineralized
Material
Shovel
Bucket Capacity (Heaped) m 3 21.0 21.0
Material Weight dmt/bank m 3 2.5 3.2
Bulk Factor 1.3 1.3
Material Weight dmt/loose m 3 1.95 2.48
Moisture % 3.0 3.0
Material Weight wmt/lcm 2.01 2.55
Fill Factor % 95 95
Effective Bucket Capacity m 3 19.95 19.95
Tonnes/Pass wmt 40.0 50.9
Truck Size Capacity wmt 225 225
Average Number of Passes passes 6 5
Truck Spot Time s 32 32
First Bucket Cycle Time s 30 30
Subsequent Bucket Cycle Time s 35 35
Load Time Per Truck min 3.9 3.4
Theoretical Maximum Productivity trucks/h 15.2 17.8
dmt/h 3,315 3,890
Truck Availability to Shovel % 90 90
Producing Hours h/a 5,221 5,221
Base Productivity wmt/net operating hour 3,073 3,605
The material weights used in the sample calculation are 2.5 t/bank m 3 for waste and
3.2 t/bank m 3 for mineralized material. The base productivity was used under normal
ideal loading conditions. Maximum productivities for both mineralized and waste
materials for the shovel and loader were reduced to 90% due to truck availability.