The Brazilian government has backed off a controversial proposal to authorise private companies to mine a huge Amazon reserve, following heavy domestic and international criticism.

President Michel Temer's office will issue a new decree today that "restores the conditions of the area, according to the document that instituted the reserve in 1984," the Ministry of Mines and Energy said in a statement.

Last week, environmental activist group Greenpeace said at least 14 illegal mines and eight clandestine landing strips were already being used by miners in the Denmark-sized reserve known as Renca in the eastern Amazon.

Greenpeace said this showed the risks faced by Renca even without Mr Temer's earlier proposal for ending a ban on large-scale foreign mining in the mineral-rich region.

Brazil's Greenpeace Campaign Director Nilo Davila at a demonstration in Rio de Janeiro against the decision to scrap a huge Amazon reserve and allow commercial mining

Mr Temer's decree signed on 25 August on opening up Renca was suspended days later after an international outcry.

The president had argued that lifting restrictions will allow Brazil to boost its struggling economy and also push the hugely destructive wildcat mining operations out of business.

In announcing the government was formally withdrawing the decree, the mining ministry insisted that the conditions that led to the measure in the first place were "still present."

"The country needs to grow and generate jobs, attract investments for the mining sector, including exploiting the economic potential of the region," it added.

The rainforest there is rich in gold and other valuable commodities but has been protected for decades from private industry and is home to several indigenous tribes.

Critics of Mr Temer's decree included international environmental groups, the Catholic Church and even the likes of supermodel Gisele Bundchen, who is Brazilian.

The Renca reserve is home to the indigenous Aparai, Wayana and Wajapi tribes and vast swaths of untouched forest, covering more than 46,000 sq\km.

Environmental groups say opening up Renca to mining would accelerate the advance of private mining and deforestation of preserved areas.

"The cancellation of the degree shows that, no matter how bad it is, no governing politician is absolutely immune to public pressure," said Marcio Astrini, public policy coordinator for Greenpeace Brazil.

"It is a victory of society over those who want to destroy and sell our forest."

He added: "Renca is just a battle. The war against the Amazon and its different peoples, promoted by Temer and big agro business, is still on."