Australian Greens Leader Bob Brown speaks to 774ABC's Jon Faine about the mining tax and the $100 million extra flowing to public services after the Greens clawed back the windfall for mining companies that resulted from MP Andrew Wilkie's MRRT deal with the Gillard government.

Other topics included today's Fairfax story about allegations about News Ltd and former Nationals senator Bill O'Chee and news that former Gunns chairman John Gay has been charged with insider trading.

Australian Greens Leader Bob Brown spoke to reporters at Senate doors this morning after the Greens' $100 million win last night for the public interest that offsets the $100 million handed to mining companies after the government's MRRT deal with MP Andrew Wilkie.

The Australian Greens have agreed to pass the Government's mining tax package through the House of Representatives while ensuring there will be no spending cuts to services such as education and health.

"This is $100 million win for the public interest just days after the government negotiated a similar win for mining companies. We have balanced the ledger for the wider Australian public," Australian Greens Leader Bob Brown said.

Talks are continuing between the Australian Greens and the Gillard government on how to make up the $20 million per annum lost by the government's readjustment of the mining tax to exclude corporations making profits of up to $75 million per annum.

The talks Australian Greens Leader Bob Brown and the Member for Melbourne Adam Bandt held with Prime Minister Julia Gillard this evening were not conclusive.

Australian Greens Leader Bob Brown joins Marius Benson on ABC News Radio to discuss the MRRT after the Gillard government further whittled away at the mining tax in response to a demand made by MP Andrew Wilkie.

Australian Greens Leader Bob Brown speaks to reporters in Canberra about the ball being in the Government's court as Prime Minister Julia Gillard seeks support for a mining tax that has been whittled away at the expense of funding for schools, healthcare and transport.

Senator Brown also answered a question about a conscience vote on equal marriage.

Australian Greens Leader Bob Brown, speaking to reporters just before Senate question time, outlines opposition to amendments that further reduce the revenue garnered by the Gillard Government's proposed Minerals Resource Rent Tax.

The Australian Greens are proposing amendments to the watered-down mining tax which are revenue positive and the Gillard Government should ensure that the revenue from the tax is not further undermined.

Australian Greens Leader Bob Brown and Member for Melbourne Adam Bandt outlined the Greens' position on the MRRT, namely to protect the revenue stream from moves in Parliament to further water down the mining tax.

The Greens will also move for a debate on setting a date for a safe exit of Australian troops from Afghanistan.

Australian Greens Leader Senator Bob Brown spoke to media in Hobart about the government's 'mini-budget' announcement. He also discussed the upcoming visit to Australia by U.S. President Barack Obama.