Oct 17 (Reuters) - Yamana Gold Inc YRI.TO
* Yamana announces filing of preliminary prospectus relating to Brio Gold purchase rights and qualification of Brio shares
* Effect of offering will be to spin-off Brio Gold as a standalone public company on closing of offering
* Yamana will maintain exposure to Brio Gold through a retained equity interest following completion of spin-off
* Intends to distribute purchase rights to its as a dividend in-kind Source text for Eikon: ID:nCCN6bzhxN Further company coverage: YRI.TO