70c, page-11

Some interesting history about the treatment of Wiluna refractory ores (just copy-n-paste the below link into your web browser if you're interested in some Wiluna refractory ore history)....

https://www.ausimm.com/bulletin/bulletin-articles/history-and-heritage-novel-gold-ore-treatment-at-the-wiluna-gold-mine-in-the-1930s/#:~:text=The%20Wiluna%20mine%20commenced%20production,Big%20Bell%20in%20Western%20Australia.

I don't think there's anything wrong with Wiluna, just the gold trapped in the arsenic mineralisation seems to be a stubborn commodity....or perhaps the Wiluna Sleepy Giant is just a grumpy dude who doesn't like sharing too much gold with WMC at this stage of the game.