Reading Time: < 1 minute

Main story

Are frac sand miners failing to check for rare butterfly? Jan. 31, 2012

Interactive Map

View locations of sand deposits, frac sand mining operations and the Karner blue butterfly range. Click the image below to open a larger version.


How Unimin dealt with its Karner blues

More reading

Hydrofrac sand mining: The resource and the issues, October 2011. Bruce Brown, senior geologist for the Wisconsin Geological and Natural History Survey.

Wisconsin DNR’s Karner blue butterfly page. Includes county maps of the butterfly’s high probability range.

U.S. Fish and Wildlife Service’s Karner blue butterfly main page. Also, a page for applicants or consultants to learn what federally listed, proposed and candidate species may be are in their project area and how to analyze whether their project may affect such species

Sand mining surges in Wisconsin, July 31, 2011. Wisconsin Center for Investigative Journalism.

Silica sand page at the Wisconsin Natural History and Geological Survey. Recently published fact sheet on frac sand, county maps and geological reports.


Tom Woletz, DNR point person on frac sand:

Dave Lentz or Jenny Bardeen, Wisconsin Department of Natural Resources Karner blue habitat conservation plan, or

Cathy Carnes, U.S. Fish and Wildlife Service endangered species coordinator:

The nonprofit Wisconsin Center for Investigative Journalism ( collaborates with Wisconsin Public Radio, Wisconsin Public Television, other news media and the UW-Madison School of Journalism and Mass Communication. All works created, published, posted or disseminated by the Center do not necessarily reflect the views or opinions of UW-Madison or any of its affiliates.

Creative Commons License

Republish our articles for free, online or in print, under a Creative Commons license.

Popular stories from Wisconsin Watch

Kate Golden, multimedia director and reporter, specializes in environmental stories and data visualizations.