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

1.6 M INING M ETHODS
The Project is a 32,000 t/d open pit mine that will be mined using conventional open
pit mining methods. A mine production schedule consisting of five mining stages
was developed for the Project starting with the development of a starter pit, located
roughly in the centre of the mineralized area. Table 1.4 summarizes key mining
details.
Table 1.4 Summary of Mining Details
Description Unit Amount
Mine Life years 37
Mining Rate (average) t/d 111,500
Strip Ratio t waste:t mineralized material 2.57:1
Milling Rate t/d 32,000
An economic cut-off grade of 0.22% nickel was calculated for planning mine
production. The total material (waste and mineralized material) produced annually at
the mine will peak at 51,000,000 t/a and will average 39,000,000 t/a, with a 37-year
life-of-mine (LOM) and a stripping ratio of 2.57:1.
1.7 M INERAL P ROCESSING AND M ETALLURGICAL T ESTING
1.7.1 MINERAL PROCESSING
The current proposal under consideration for Wellgreen includes a 32,000 t/d
conventional crushing and grinding circuit comprising a jaw crusher and semiautogenous
grinding (SAG) mill combination followed by a MF2 type process in order
to produce a bulk nickel-copper concentrate for sale and treatment off-site. Although
developed primarily for UG2 ores (South African PGE deposit), the MF2
configuration offers certain advantages such as prevention of over-grinding and
slimes generation, increased rejection of talc, chlorite and pyrrhotite and early
recovery of PGM. The concept is to gradually reduce the size of the ore particles,
and float the liberated material immediately after each size reduction. Secondary
grinding will be by ball mills and tertiary grinding by vertimills. The process will be
comprised of two trains, which are identical from crushing through to the concentrate
and tailings thickeners. The concentrate will be thickened, filtered, and loaded on
trucks to be transported for further processing off-site (eg. sale or toll smelting). The
tailings will be thickened and pumped to the tailings management facility (TMF).
Prophecy Platinum Corp. 1-7 1193460500-REP-R0001-02
Wellgreen Project Preliminary Economic Assessment,
Yukon, Canada