200kt is referenced in the Barron report.
"Tse says the mine can produce 200,000 tons of lithium concentrate – or spodumene - a year, although initial output will probably be around 150,000 tons."
http://hotcopper.com.au/threads/barrons-subscription.2765474/page-4?get_post=true#.Vz1gjZN97UZ
As to how expansion capex works there was also this statement in the same interview
"General has put about AUD25 million into getting Mt Cattlin off the ground again".
I'm not sure how this fits in or whether this included the equity buy in payments. One of the documents has a reference to a cost for it to get to 200kt. I can't locate or remember the figure at at the moment - somebody??
In principle both parties would be liable for all joint expenses. Hopefully tantalum is profitable enough to basically flow into these kinds of expenses. I haven't paid any attention to this side of things yet.
Mt Cattlin was just reaching over-performing its 137kt when it was closed down.
I have links to the old shipment sizes and announcements if anybody is that interested.
Some of the increased production is to come from a set of efficiencies - improved recovery in the circuits and planning longer shifts by way of noise reduction. The planned expansion to 150kt goes back to the Fotios era. I would assume that one of the benefits of not running the coarse circuit right now is that they have had a chance to improve this area of the plant in some substantial way.