There are 3 main variables

1  the ongoing price of copper

2  whether New Prosperity gets the go-ahead or not.  No way to know

3  If Prosperity gets the green light then a new variable evolves;  the price of gold.  I am an optimist on this aspect

Number 2 question should be decided within 6 months but surely the final answer will be known within one year even if there are follow up questions

The future price of copper is a total black box;  predictions involve wild guesses about demand in China which in turn will be influenced by Europe and USA woes or improvements.   Nobody knows