The small plane banked to the right over western Wisconsin, allowing a view of the rolling green hills pocked with large tan holes made by frac-sand mines. Then, near Chippewa Falls, the forests gave way to a massive hole and three sprawling rectangles of brown and blue -- holding ponds -- that made the landscape look like a game board.
Machines clawed at the hills, and dozens of trucks lumbered down local roads extending from the region's largest frac-sand mine.
"Wow, look at the size of that," said state Sen. John Howe, R-Red Wing. "It's huge."
From above, you could get a feel for how sand mining has spread across Wisconsin. Howe wanted to get a firsthand look because this kind of mining is coming to his southern Minnesota district, and it's coming at warp speed.
A few years ago, there were only a handful of sand mines along both sides of the Mississippi, and much of that sand was used for roads. But then the oil industry discovered that silica sand could be forced into cracks in the earth to bring up oil, and suddenly the dirt along the river became a treasure.
There are now more than 60 mines operating along the Wisconsin border, with more than 40 more permits pending. Minnesota, according a DNR map, has at least five existing sand mines and six permits pending. But almost every week this summer, there have been meetings in town halls and tiny townships over mining expansion, with more permits being requested.
The mines offer jobs and economic benefits, and no doubt bring some. But many residents are quickly realizing that the industrialization of their region, while good for the small number of lucky landowners who will get rich, could ruin their own businesses and way of life.
That's why Howe, a conservative who generally favors local control on land-use issues, recently sent a letter to Gov. Mark Dayton asking for help and $1 million for a general environmental impact study.