WO3 goes for about $36K a tonne but they sell it as metric ton units MTUs as think its called API for about $360 a MTU
There is 100 MTUs in a tonne
But there is a big variability in quality and what it is paid for by the smelters due to delitereous metals like Mg.
WLFs is opencut which lowers the C1 cost think it is still around 1.5g a ton Au equiv for .12% WO3 though.