when is the best time to buy

The best time to buy is the time when no one wants it and the shares are offered to the market at a huge discount.

If you believe that PNA has no future, will never pour gold and that the Phu Kham copper/gold deposit is not worth looking at, then do not touch this one.

If you believe that PNA can make a nice profit from the Phu Bia goldmine and the huge Copper resource, and add more resource byt the way of exploration, then now its the time to buy.
Because if the latter is right you will be well rewarded.

jojo