BLAIR, WIS. -- Lou Ellen and Jim Frei spent 40 years as hardscrabble dairy farmers, cussing the sandy soil that gave them and their tractor such fits.

Today they are finally breathing easy, thanks to that same gritty land. They just moved into a new one-story house on Sjuggerud Coulee Road. Now they don't have to worry about climbing their old farmhouse stairs on knees made sore by milking cows.

Once so poor they couldn't afford new shoes when their daughter started school, they now have more than $550,000 in the bank.

"We've even got a Jacuzzi tub now," said Jim, 66, chuckling about their sudden change of fortune.

Two years ago, the Freis sold that sandy farm to a mining company.

It's a story playing out across the Sand Country of western Wisconsin and southern Minnesota, as mining companies snap up farms and pastures to dig the round silica sand coveted by oil and gas companies for the drilling technique known as "hydro-fracking.'' As American oil and gas production soars to new heights, here, amid rolling hillsides and Amish farms, families such as the Freis -- and countless others -- are being swept up in the global energy game.

While they count themselves fortunate, the Freis acknowledge some heartache. They get envious glares from neighbors who were hay-baling partners for years. Some neighbors won't wave anymore as they pass on country roads.

"This has become a very divisive local issue, with some people becoming quite wealthy in what used to be a tough rural farming area," said Tom Woletz, who tracks frac sand mines for the Wisconsin Department of Natural Resources.

"It's certainly big money and a big change,'' he added. "And if you're not in, you're out. So you've got families and neighbors that aren't going to talk to each other for the rest of their lives and hillsides you looked over your whole life now cut wide open. Who could have imagined it?"

Turning sand to green

As they unpack boxes of dishes and rehang the two antlered buck heads Jim hunted on his old farm, the Freis pinch themselves.

"It was just too good a deal," Lou Ellen said. "And the impact it's had on our lives has been tremendous financially."

Jim admits he can be a smart aleck at times, such as when the real estate guy from the sand mine first stopped by and asked if his farm was for sale.

"I said everything's for sale for a price.''

They hopped in Jim's pickup and drove over to his grain bin.

"He took out a little hatchet and chopped a piece of the sandstone," Jim recalled. "Oh, he was just smiling."

Along with three neighbors -- Phineas Schrock, the Axnesses and the Neuenschwanders -- the Freis received $3,850 an acre for their 143 acres from Winn Bay Sand Co. The deal gave them 10 years of rights to continue farming, logging and hunting.

"When the guy named Harold drove into my driveway -- the guy who writes the checks -- I walked over and gave him a big hug," Jim said. "Then I turned around and said, 'Watch it, I'm not that kind of guy.' I was just happier than heck after all those years working my fool head off."

All told, there are more than 100 sand facilities, operating or proposed, in western Wisconsin. The boom is still emerging in Minnesota, where several counties have moratoriums in place. But mines are digging, or facilities are planned, near Shakopee, St. Charles, Le Sueur, Winona, North Branch and Wabasha -- to pinpoint just a handful.

Ancient landscaping

Why here? When the glacial ice sheets plowed through 10,000 years ago and dumped fertile sediment onto the landscape of southern Minnesota, they skipped a wide swath of the so-called driftless area of southwestern Wisconsin and southeastern Minnesota.

"That left what we call a bedrock landscape with a sandstone layer very close to the surface," said Tony Runkel, chief of the Minnesota Geological Survey. "One reason the area is so scenic, rugged and hilly is because it was spared from glaciation."

Now that landscape has changed the financial landscape for farmers who had struggled for years with low milk prices and stingy corn yields.

"They went from not wanting their kids to go into farming because it was like tying a millstone around their necks ... to these huge amounts of money," said Kent Syverson, geology chairman at the University of Wisconsin-Eau Claire. "These sleepy county roads are no longer so sleepy."

Or, as one of the Freis' neighbors, Lorna Tenneson, put it: "It's like the Beverly Hillbillies: Who would have thought these hills we've been tipping our tractors over on all these years would become such a hot commodity?"

Hot is right. Frac sand opponents have packed meeting halls and circulated petitions, worrying about increased dust getting into their lungs, heightened truck traffic pummeling their roads and all that water the mines would suck from the aquifers.

"There were two armed police officers at the back of one meeting -- that's how hot it got," Lou Ellen Frei said.

Laughing in his grave