A new motion passed by the Greens and Coalition may reveal secret details on the mining tax and the amount of money it has raised.
Under the new motion the tax commissioner will be forced to disclose the amount of money the mining tax has earned, which is currently unknown.
While exact details are private BHP Billiton, Rio Tinto, Xstrata, and Fortescue Metals Group said earlier this month they had escaped paying the tax for the second quarter in a row.
The announcements have led most pundits to predict the tax has raised no funds, but the figures have not been confirmed by the Federal Government.
The motion, moved by Greens leader Christine Milne and backed by Coalition senators, was passed after legal advice provided to both groups claimed the parties could request revenue details from the tax commissioner.
The Taxation Office said it was currently seeking its own legal advice regarding the requests.