How I read this is,
structure of the project ownership is as below.
AVZ = 51%
DRC = 25%
CATH = 24%
Avz have $240m to spend for the capex.
Any capex required to build the mine (DFS $540m) now would be pro-rated, meaning CATH still needs to cough of 25% of the capex.
Overall we are going mining.