September 2021 Update had some useful info on leaching process:
“Bench scale flotation testwork on fresh mineralisation showed similarities to Southern African sulphide PGM ores (e.g. Platreef ores from South Africa and Great Dyke ores from Zimbabwe). PGM recovery of 71% and Cu recovery of 69% was reported from a rougher flotation test, with a cleaner test achieving grades of 58g/t 3E PGM and 5% Cu. The rougher test is considered to be indicative of overall recovery potential while the open circuit cleaner tests are 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 on the oxidised mineralisation continues to investigate the potential for a leach process route with objectives to: 1. maximise metal recoveries from the oxide mineralisation in Parks Reef; and 2. evaluate the potential for production of a high-purity product(s) that may be marketable directly to metal refiners.
Leaching testwork on oxide mineralisation has shown the ability for dissolution of the targeted metals with a sulphuric acid - chloride leach system rapidly leaching the tested samples under atmospheric conditions, with 70% 3E PGM extraction achieved in three hours with moderate reagent consumptions at 90 degrees C.”
Trying to figure out if a roasting kiln is required…capex etc. Doesn’t seem so.
POD Price at posting:
11.5¢ Sentiment: Buy Disclosure: Held
