Now your dealing in semantics. What is your definition of NTA?
My definition as most would take it, is book value of tangible assets - all liabilities divided by number of share.
If you want to make some valuation model of future cash flows, then sorry, that's not NTA. NTA is not an abstract where you can apply your own discount.
As at balance date, NTA of OCA is $1.41. End of.