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From recent 5E announcement:

Mining and metallurgical methods and parameters, and other modifying factors considered to date
A concept mining study has been completed to support the open cut and underground mining options for Parks Reef. Mining of the open cut deposit is assumed to use conventional drill and blast open cut mining methods, with limited selectivity. No mining method has been selected for the potential underground mining which will be subject to further study and consideration.

Sighter flotation testwork on targeted primary sulphide mineralisation in Parks Reef shows similarities to Southern African
sulphide PGM ores. PGM recovery of 71% and Cu recovery of 69% was reported from rougher flotation tests, with cleaner
tests achieving grades of 58 g/t 3E and 5% Cu. The rougher test is considered indicative of overall recovery potential
while the open circuit cleaner tests indicative of potential concentrate grades.

The PGM recovery was increased to 81% with the addition of a secondary rougher stage and finer grind. Leaching testwork has shown the potential for dissolution of the target metals from the oxide and sulphide mineralisation zones. The atmospheric leach conditions rapidly leaching the tested samples with 60-80% 3E PGM extraction achieved in five hours; and Leaching testwork has shown potential for copper, nickel and cobalt extraction at recoveries ranging from 50 - 95%. Further metallurgical testwork is currently in progress.