sorry re: Platreef cut-off grade they actually say 2g/t PGM is their base case (so not 3g/t). They also have copper and nickel credits. Platreef goes very deep - here up to 1.35km deep. So if we also have a reef so much deeper than 300m (maybe even kilometers deep) - we are also looking for a similar cut-off to make it economical?
"The 2 g/t 3PE+gold cut-off is considered the base case (3PE+Au = (platinum+ palladium + rhodium) + gold). Mineral Resources are stated from a depth of approximately 500 metres to 1,350 metres below surface. Indicated Mineral Resources are drilled on approximately 100 x 100-metre spacing; Inferred Mineral Resources are drilled on 400 x 400-metre (locally to 400 x 200-metre and 200 x 200-metre) spacing."
https://www.ivanhoemines.com/news/2020/platreef-mine-development-work-now-focused-on-equipping-recently-completed-shaft-1-for-first-production/
Ann: Diamond Drilling Confirms Continuity of Parks Reef at Depth, page-43
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