"Buyout option means in terms of Copper Fox,"

There isn't a specific buyout option, that I am aware of, nor does Teck have a stated ROFR, to my knowledge

It might be of interest to folks here to read or reread the Salazr agreement which sets out most of the deal mechanics that are at play here

https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B1opssTdj4BuY2FkMmQzMDctNzdiZC00Njg1LTg3YzUtNTY2MzhjODRlMGFl&hl=en_US&authkey=CPLqmtQO

This from the link library, posted by Willy Nilly

There may be other agreements at play, but their effect isn't known