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

17.0 RECOVERY METHODS
17.1 P ROCESS D ESCRIPTION
A description of the proposed process that will be used to create a bulk nickel/copper
concentrate at the Property is presented below. The throughput will be 32,000 t/d.
The Wellgreen run-of-mine (ROM) mineralized material will be subjected to primary
crushing, primary grinding, a MF2 flowsheet, tailings and concentrate thickening,
concentrate load out, and tailings disposal in a TMF. A bulk concentrate will be
created for sale or toll-smelting off of the Property. The entire process from crushing
to concentrate load out will be carried out in two identical trains. For simplicity, only
one of the trains is described below and is presented in Figure 17.1.
The primary crusher will be a jaw crusher fed by a loader off of the ROM stockpile.
The loader will dump onto a grizzly, with the oversize from the grizzly feeding the jaw
crusher. The undersize from the grizzly will fall directly to an apron feeder along with
the jaw crusher product. The combined product from the jaw crusher and the grizzly
undersize, will be fed by apron feeder and conveyor to the coarse mineralized
material stockpile. Material will be drawn at a constant rate by apron feeders below
the coarse mineralized material stock pile, feeding the SAG mill feed conveyor. The
conveyor will deliver the crushed material to the SAG mill feed chute.
The SAG mill grinding will be done on a slurry. The SAG mill product will be passed
through a double deck vibrating screen. The first deck will have a 13.2 mm aperture
and the second deck will have a 2 mm aperture. Material smaller than 2 mm
(-2 mm) will continue on to primary rougher flotation. Material larger than 13.2 mm
(+13.2 mm) will be recycled back to the SAG mill. Material which is smaller than
13.2 mm but larger than 2 mm (-13.2 mm and +2 mm) will be fed directly to the ball
mill feed inlet with the primary rougher tail. The SAG mill product will be subjected to
a MF2 flowsheet which was developed in South Africa for processing PGE
mineralized material.
In the first stage of the MF2 flowsheet, the SAG product will be subjected to a flash
flotation (i.e. primary rougher) to recover as much of the platinum, palladium, nickel,
and copper minerals as possible at a coarse grind. Pyrrhotite depressants will be
used to try and optimize the grade of the concentrate. The concentrate from the
primary rougher will be sent to the secondary cleaner. The tail from the primary
rougher will be subjected to secondary grinding in a ball mill.
Prophecy Platinum Corp. 17-1 1193460500-REP-R0001-01
Wellgreen Project Preliminary Economic Assessment,
Yukon, Canada