http://www.indmin.com/Article/3051832/OSHA-issues-US-hazard-alert-for-frac-sands.html

 

OSHA issues US Hazard Alert for frac sands

State of Wisconsin - intrastate regulatory disparities exist with some affected counties in the state having their own moratoria. Jurisdictional moratoriums on silica sand mining continue to exist in different US states.