Prospective uranium miner, Toro Energy, says the Federal Government has further delayed the environmental assessment of its Goldfields uranium project.
The state's first proposed uranium mine, near Wiluna, has already received State Government approval and the owners are now awaiting a decision from the Commonwealth, which was due today.
Toro's managing director Greg Hall says the late request from the Federal Government for further information is frustrating.
"We are somewhat disappointed that this has come almost at a last minute," he said.
"There has been a lot of opportunity during the bi-lateral process through which the federal government's been engaged for well over three years, to really clarify any additional information." Mr Hall says he is unsure if it will affect Toro's expected start date.
"At this stage we don't know what impact it will have on the timetable, if any," he said.
"We recently put out a revised timetable on Wiluna anyway.
"We put out an announcement updating that timing a few weeks ago such that we don't envisage a board decision on advancing the project until the latter half of '13." Mr Hall says they are still hopeful of an approval coming through.
"It's up to the Government what the decision will be, we hope it will be an approved decision," he said.
"We believe we can easily provide clarification on any areas the minister would like."