For Cuu or TT to be carrying out this type of analysis would it not be safe to say that the BFS is done or very close to being finished to change the variables one at a time and create a new NPV?

Normally, a table is created showing the effect of any of the changed variables

For instance, how varying the assumed price or quantity of a metal at different cutoff grades wold effect the economics of the project

I think it is safe to assume that they are pretty far along in building this study and further assume that it will be based on the findings reported in the new RE

This analysis will be only one component of the FS though and the data for it is probably pretty much known

The long pole in the FS exercise appears to be the completion of the mine plan though, which may be in some flux due to the emerging nature of the locations of the mineralization and the engineering needed to plan the methods for extraction and tailings, etc