@Kangaroo11, it's possible the answer to your question is 'Yes'....

@Kangaroo11, it's possible the answer to your question is 'Yes'. I think @Golddigga nailed it with his comment about the importance of having a mine plan that delivers ore to the mill in a timely manner. There were more than a few occasions in the past where BLK found themselves 'mine constrained' for one reason or another. Maybe they've learned valuable lessons about scheduling & will avoid creating the same issues on Stage 1 (only time will tell). It's good that Byrnecut are the U/G mining contractor.

The mining history for Wiluna sulphides is interesting...here's some info about what it was like mining sulphides in the 1930's...(just copy & paste the below link into your web browser if you feel like having a read)...

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

On a positive note, some historic production details from refractory ore are below (ref: ASX announcement dated 17/10/03 when Gowit acquired Agincourt)...