IIRC they have mentioned before that the purification circuit costs around US$2000pt at the moment.
I don't think they would have issues shifting BG above US$7700pt. Spot pricing in China is still well above that. Therefore I believe US$5700pt is too low.
Yes, S2 output would have a mix close to 50% however they haven't been achieving anywhere near that with S1.
AIMHO
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