I don't know when you bought it and how much but i'll say...

I don't know when you bought it and how much but i'll say this:
1) if you get a mineral company form discovery to production it's rare.
2) the average rate of return from miners has been poor except if you held them during commodity price booms. 
3) you will get a chance to top up and or reduce your average price as part of financing. 

Combine points  2 & 3 and you may well get a significantly better rate of return. 

Conversely it's not clear what other assets or asset class prices will do from here. 

Please don't take this as advice.