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

topographic survey of the open pit and waste stockpiling areas at a suitable scale,
will be required for the next level of study design.
WASTE ROCK DUMP DESIGN
The stability of the waste rock piles placed near the open pit needs to be determined.
Testing on the load carrying capacity of the overburden and its deformation
characteristics will be required to determine a suitable setback from the pit limits to
ensure that the overburden does not flow towards the pit. Time constraints on how
long it will take to compress the overburden material, need to be determined in order
to sequence the waste placement.
Waste dump progression planning should be an integral part of subsequent levels of
study, in order to optimize rock placement for stability and optimize waste haul cycle
times.
The acid generating potential of the waste rock needs to be assessed. Sequencing
of the waste placement and remedial measures to mitigate any potential problems
requires assessment.
The possibility of metal leaching also needs to be tested to determine if this is an
issue.
PRODUCTION RATE
Based on the 32,000 t/d (11.2 Mt/a) open pit base case scenario, the potential to
improve the overall project economics exists with increased throughput. That rate
should be determined by a trade-off study.
Another potential trade-off studiy that could be considered in the future includes haul
truck versus conveyor for mineralized material transport to the mill. This study would
be highly dependant on the Mill site location.
The estimated cost for the first phase of the above work is US$50,000.
26.3 M ETALLURGY
It is recommended that further metallurgical test work be undertaken in order to
develop the metallurgical process flowsheet. An MF2 type flowsheet as suggested in
this report or similar arrangement can be considered. A laboratory program to
analyze the appropriate flotation reagents and dosages as well as other flotation
variables is currently underway. Once this is completed an MF2 or similar flowsheet
should be tested in the laboratory to determine how it will perform on this material.
Test work should include the creation of a bulk concentrate and separate nickel and
copper concentrates, to determine the extent to which the PGEs follow the nickel, the
copper or how they may be distributed between two concentrates.
Prophecy Platinum Corp. 26-5 1193460500-REP-R0001-02
Wellgreen Project Preliminary Economic Assessment,
Yukon, Canada