The firm has submitted the SEIS for review to the Australian, South Australian and Northern Territory Governments in December 2012.
The Governments have given permission to release the document publicly, after performing a series of adequacy checks on the SEIS.
BHP is awaiting the final government approvals for the proposed expansion of the project.
BHP Billiton uranium customer sector group president Dean Dalla Valle said the Olympic Dam project, consists of largest uranium deposit, along with copper and gold resource, and will inject billions of dollars into the South Australian economy.
