Generation Mining Announces Completion of Pilot Plant and Feasibility Study Update - Seite 3

 

Notes:
1	Metal recoveries and Cu-PGM concentrate grades listed were established during Q4 2020 Phase 2 pilot plant testing.
2	Metal recoveries listed were determined during Q2-Q3 2020 Phase 1 benchscale metallurgical testing.
3	Preliminary Economic Assessment (“PEA”) titled “Amended Technical Report, Updated Mineral Resource Estimate and Preliminary Economic Assessment of the Marathon Deposit, Thunder Bay Mining District Northwestern Ontario Canada”, July 6, 2020.
4	The estimated recovery of Cu is noted per the PEA for production years 6 to 14.
5	Lower platinum recovery in the Phase 2 pilot plant program was a function of lower bulk composite head grade and is not considered a material impact to the established recovery equation to be used in the Feasibility Study.

Figure 1: PGM-Cu Conc produced during Q4 2020 pilot plant testing of the Main Zone Composite sample at SGS-Lakefield
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The process flowsheet considered for the project includes conventional primary crushing, SAG and Ball mill grinding with a pebble crusher, followed by rougher flotation, concentrate regrinding, and three stages of cleaning to produce a Cu-PGM concentrate. A PGM scavenger flotation circuit on rougher tailings provides an incremental gain in overall metal recovery. As part of the of the Feasibility Study and financial analysis, the economics and timing of the PGM Scavenger circuit is being studied.

During Phase 1 testwork, the effectiveness of Woodgrove direct flotation reactors (DFR cells) on rougher flotation with a flotation feed size of 80% passing 106 microns were evaluated. DFR cells were similarly evaluated for cleaner circuit flotation during Phase 2 pilot plant testing. DFR cell technology is being considered in the Feasibility Study throughout the flotation circuit offering the potential for improved final concentrate grade, at maintained metal recovery, with reductions in operating cost and initial constructed capital cost when compared to a conventional flotation circuit design.