Based on my limited knowledge and based on current share price if buy shares now, my guestimation model -

            Rew X possibility  /  Risk      = R/R ratio (in 3-6 month)

PTU      100% X (7/3)       /  -30%     = 7.8  (if no huge finding, out at 12c)
              700% X (2/8)      /  -30%     = 5.8   (if hope for major finding)

NXE      400% X (3/7)      /   -30%     = 5.7

FCU      100% X (6/4)      /   -30%     = 5.0  (only insider can predict M&A)

All 3 have very good RR ratio, in fact they are the best among 200 companies that I screened.
 
However, since M&A are not predictable for me, although I expect DML may take action to merge it.  IF no M&A, FCU may follow UEX's route stay there for years.  In fact, from FCU chart, I guess profit-taking has started. Hence I personally prefer PTU & NXE at current prices.

JMHO

attached:  house position for FCU in last 6 trading days