A decade-long ban on hydraulic fracturing — better known as fracking — in South Australia's Limestone Coast region looks set to be enshrined in law.

Key points: 10-year ban on fracking to be legislated by SA Government

10-year ban on fracking to be legislated by SA Government It previously said a ministerial direction opposing the technique was sufficient

It previously said a ministerial direction opposing the technique was sufficient Labor Opposition says "industry ban" done without consultation

The State Government has backflipped on its opposition to legislating a moratorium, and will support a bill put forward by Mt Gambier independent MP Troy Bell, a former Liberal.

"The community has spoken — they're fearful of the technology," Mr Bell said.

"It's not that the South-East is against mining or gas extraction, it's this technology, in that location over limestone where there's aquifers that the entire region relies on."

In July, the Liberals sided with Labor to block a Greens bill in the Upper House that would have achieved the same thing.

The Government argued that its ministerial direction to reject any applications for fracking went far enough.

The Liberal Party promised a 10-year moratorium on fracking in the South-East ahead of the March state election.

"This bill tries to play politics by bringing into question that moratorium," Investment Minister David Ridgway said at the time.

"We made a commitment for a 10-year moratorium, and that is what the people of the Limestone Coast and the South-East have."

Speaking after a rally of South-East locals on the steps of Parliament House today, Liberal MP for MacKillop Nick McBride declined to say whether he would have crossed the floor on the issue.

"I'm going to work within the party lines — I've taken on board the community sentiment and I've put that in the party room as strongly as possible," Mr McBride said.

A shale gas exploration well near Penola in the state's South-East in 2014. ( Supplied )

He argued the ministerial directive was not what his constituents wanted.

"If we were to see two full terms, that means we've only got an eight-year moratorium, then the next government could easily erase any ministerial directive," he said.

Opposition mining spokesman Tom Koutsantonis blasted the Government's backflip.

"I think it's fair to say the mining sector is sick and tired of the surprises they're getting out of a conservative government they believed would have been on their side," he told Parliament.

Anne Daw says the South-East fracking ban doesn't go far enough. ( ABC News: Tom Fedorowytsch )

"Members opposite, who claim to be pro-business, pro-resources, are just going to ban an industry altogether without any consultation."

Anti-mining campaigner Anne Daw said conventional mining still posed a risk to the South-East.

"The same sort of complications with conventional gas — flaring, spewing contaminants into the air, the groundwater's at risk, the soil is at risk — there's a large section of the community down there that want all mining, all petroleum activities banned," she said.