The Chicago Sun-Times has an interesting article on a growing debate involving the mining of frac sand in the Midwest and the rise of anti-sand mining activists: "Crispin H. Pierce, an environmental public health professor at the University of Wisconsin-Eau Clare, said more information is needed about the risks of frac sand mining. Fresh silica dust has grains with sharp, jagged particles and is more dangerous than the weathered silica found in dirt, although it weathers quickly, he said."
Anti-sand mining activists ...