The DFS was completed mid 2014 from memory, should be on the Sirius website and it was vital in proving up feasability to get the funding. The fact it was just recently renegotiated by IGO on slightly better terms is proof that lenders aren't too nervous about the nickel price when production starts.
As for validation, pretty sure WSA recently reported a very similar AISC.
If they've lied, well, its fraud. I think if you put some research into it, you may just end up a Nova fan
EL. You can't blame the SP thumping on Nova.
IGO Price at posting:
$3.20 Sentiment: Buy Disclosure: Held
SIR Price at posting:
$2.64 Sentiment: Buy Disclosure: Held