I don´t know the fundamentals of COB, but the 850t from N27 are JORC-compliant inferred (2012).
And the exploration target of N27 are 10mio ton * 0,12% cobalt = 1,2Mio t cobalt
Would be 82B material value if I am not wrong.
N27 Price at posting:
55.0¢ Sentiment: Hold Disclosure: Held