Vanadis IPO, page-257

Another close to surface shale project in the USA with 0.3 per cent vanadium. I don't know how comparable these numbers are but in this case the breakeven price is expected to be US $7.76 dollars per pound. 

https://www.prophecydev.com/PCY_Oct11.18.pdf

Highlights of PEA (after tax)

Average annual production 9.65 million lbs V2O5

Average V2O5 selling price $12.73 per lb

Operating cash cost $4.77 per lb V2O5

All-in sustaining costs (AISC) * $6.28 per lb V2O5

Breakeven price** $7.76 per lb V2O5

Capex including 25% contingency $116.76 million

Strip ratio 0.17 waste to leach material

Mining operating rate per year 3.4 million tons V2O5 heap leach

recovery rate 62%

Life of mine 13.5 years