little disappointing, page-4

For those that are interested there is a paper put out by Goldrush Resources

"Mineral Resource Estimation Ronguen Gold Project
Burkina Faso"

which has a bit of info about the gold mineralization and geology of the BK greenstone gold deposits.
Their tenements are quite a bit north of Nabanga but it still might be applicable.
Thing I found interesting was that the gold in the oxide zones is generally free milling and the oxide zones can be up to 100m in depth. The primary ores can be both free milling and refractory