Pebble mine will never be developed, that is because it is a low grade ore body, the only ones who weren't aware of that was the large multinational mining companies. Once they found out they cut their losses and left.

Northern dynasty is nothing but a penny stock company, they don't have the finances, equipment, or experience to develop a mine. Everyone in the industry knows this, there is a reason why Cominco Alaska had zero interest in developing the pebble ore body.