With ballots on their way to Colorado voters this week, proponents and opponents of Proposition 112, the statewide measure to expand oil-and-gas setbacks, are making their campaign moves.

Those who support the 2,500-foot buffer zone for new oil and gas operations say a new study disputes the dire economic impact the industry says it will have. And opponents, including 40 Colorado mayors, are planning a rally with energy company employees Tuesday at noon at the state Capitol to defeat it.

And from 4 to 6 p.m. Tuesday, energy employees, their family and friends will be waving signs at intersections at intersections scattered from Castle Rock to Fort Collins.

Meanwhile Monday, Colorado Rising, the group supporting Proposition 112, flagged a report this month that counters the industry’s narrative: that passing the measure would virtually ban oil and gas development on private property in Colorado.

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Anne Lee Foster, a spokeswoman for the group, touted the findings of Colorado School of Mines assistant professor in economics and business Peter Maniloff, who said that while the buffer could put 85 percent of the state’s surface area off limits, horizontal drilling could make some subsurface resources available.

“I find that 42 percent of the non-federal subsurface would be accessible, or nearly three times the available surface area,” Maniloff wrote on the website for the School of Mines’ Payne Institute. He called it a “conservative estimate.”

Foster called that “proof” that the industry’s campaign exaggerations.

“This analysis shows the industry can and will continue to operate in Colorado, all while protecting public health and safety with a common-sense buffer zone, based on health studies, from this toxic, industrial activity,” she said in a statement. “We have seen these Chicken Little scare tactics from big corporations before, and Coloradans aren’t falling for it again.”

The group called Mayors Against Proposition 112 will differ on Tuesday at the Capitol.

The opposition group is supported by the Colorado Petroleum Council, which touts a study from the Commonsense Policy Roundtable that indicates that, if passed, the setback rule could cost state and local governments about $1 billion in tax revenue and potentially 100,000 jobs.

Setbacks are currently 500 feet from homes and 1,000 feet from schools.

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The mayors opposing Proposition 112 are: