Seth Perlman, Associated Press
In this May 21, 2013 file photo, a protester against fracking attends a rally after a House Committee hearing on hydraulic fracturing legislation at the state Capitol in Springfield, Ill.

ST. LOUIS — A southwestern Illinois judge has denied a bid by a landowners group to suspend the state's new rules for high-volume oil and gas drilling, ruling that the plaintiffs failed to show they would suffer immediate harm if the practice commonly known as "fracking" was to go forward.

Madison County Circuit Judge Barbara Crowder rejected the request for a preliminary injunction on Friday, three days after she heard arguments about the rules meant to regulate hydraulic fracturing.

Attorneys for the landowners had insisted that the rules drafted by the Illinois Department of Natural Resources and approved Nov. 6 by a legislative panel were procedurally flawed, among other things because the DNR allegedly didn't consider scientific studies and had no representative available to answer questions at statewide public hearings last year. Attorneys for the state countered that the public had had sufficient input.

It was not immediately clear whether the landowners, who along with the Southern Illinoisans Against Fracturing Our Environment group sued on Nov. 14 to at least delay the rules from taking effect, planned to appeal Crowder's ruling. A message left Sunday with one of the plaintiffs' attorneys, Vito Mastrangelo, was not immediately returned.

"At this point, I don't consider anything a significant setback," said Annette McMichael, a spokeswoman for the anti-fracking group. "We've had so many setbacks in the year and a half since the bill was signed, but we just keep forging ahead. We are never, ever going away."

Two spokesmen for the DNR didn't immediately respond to Sunday voicemails seeking comment.

Fracking generally uses a mixture of water, chemicals and sand to crack rock formations deep underground and release trapped oil and gas. Opponents fear it can cause air and water pollution and health problems. Industry officials contend the method is safe and will create needed jobs in southern Illinois.