It pains me to say it looked good on the napkin but you may be more than right........... it could be 10% of 900 considering it’s waste.
Another way to see closer to double digits for annual throughput is to work out what’s the profit margin upgrading from SC6 150kt to PLS 47kt where the profit after costs is about$5000/t versus $700/t ?
I’ve run out room on my napkin for the mtpa Spodumene equivalent but it seems to be about 6mtpa
With a second PLS train that might be 7.5mtpa equivalent in Hardrock processing......