There is one hurdle which will never be overcome.The existing USACE submitted "small" mine plan is uneconomic. The entire resource is likely uneconomic to mine by open pit method.
The only hope is underground mining if copper equivalent low-grade can support.
Underground mining with reactive waste rock and tailings backfilling substantially reduces need for perpetual water treatment, closure maintenance, capex/closure costs and liability. Facilities footprint is also drsstically reduced due to less throughput.
New USACE 404 permit application and EIS.
However, we suspect the proponent already understands and avoids such discussion. Eight major miners, minimum, already understand and are uninterested.
20-years. $1 billion spent. Nothing.