RE:Something for you guys to do. They're using drift-and-fill for 99% of the ore at Kakula. Total extraction estimated at 96%. This includes 75% of pillars.
Room-and-pillar will only be used on approximately 1% of the ore, and has a much lower extraction rate.
You'll find it all in the resource update filed March 27, 2020 pp 299-342.
Feasibility will provide more precise info.