RE:RE:RE:Bad news?
Proven reserves and the ore grade will determine the mine viabilty.
With most infrastructure in place the operational costs per ton will be lower.
Some open pit mines are running at $40 - $50 per ton just in overhead costs.
Horne 5's gross cut-off is $80 per ton in ore value, definitely not much left in profit.
A profitable underground start-up should be recovering at least $500 per ton @ 4,000 TPD. imo